Merge pull request #2698 from soltanmm/reorganize-python

Reorganize src/python.

35 files changed, 4553 insertions, 0 deletions

diff --git a/src/python/grpcio_test/grpc_test/framework/__init__.py b/src/python/grpcio_test/grpc_test/framework/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/base/__init__.py b/src/python/grpcio_test/grpc_test/framework/base/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/base/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/base/implementations_test.py b/src/python/grpcio_test/grpc_test/framework/base/implementations_test.py
new file mode 100644
index 0000000000..5a7d1398fd
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/base/implementations_test.py
@@ -0,0 +1,80 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Tests for grpc.framework.base.implementations."""
+
+import unittest
+
+from grpc.framework.base import implementations
+from grpc.framework.base import util
+from grpc.framework.foundation import logging_pool
+from grpc_test.framework.base import interfaces_test_case
+
+POOL_MAX_WORKERS = 10
+DEFAULT_TIMEOUT = 30
+MAXIMUM_TIMEOUT = 60
+
+
+class ImplementationsTest(
+    interfaces_test_case.FrontAndBackTest, unittest.TestCase):
+
+  def setUp(self):
+    self.memory_transmission_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.front_work_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.front_transmission_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.front_utility_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.back_work_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.back_transmission_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.back_utility_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.test_pool = logging_pool.pool(POOL_MAX_WORKERS)
+    self.test_servicer = interfaces_test_case.TestServicer(self.test_pool)
+    self.front = implementations.front_link(
+        self.front_work_pool, self.front_transmission_pool,
+        self.front_utility_pool)
+    self.back = implementations.back_link(
+        self.test_servicer, self.back_work_pool, self.back_transmission_pool,
+        self.back_utility_pool, DEFAULT_TIMEOUT, MAXIMUM_TIMEOUT)
+    self.front.join_rear_link(self.back)
+    self.back.join_fore_link(self.front)
+
+  def tearDown(self):
+    util.wait_for_idle(self.back)
+    util.wait_for_idle(self.front)
+    self.memory_transmission_pool.shutdown(wait=True)
+    self.front_work_pool.shutdown(wait=True)
+    self.front_transmission_pool.shutdown(wait=True)
+    self.front_utility_pool.shutdown(wait=True)
+    self.back_work_pool.shutdown(wait=True)
+    self.back_transmission_pool.shutdown(wait=True)
+    self.back_utility_pool.shutdown(wait=True)
+    self.test_pool.shutdown(wait=True)
+
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)
diff --git a/src/python/grpcio_test/grpc_test/framework/base/interfaces_test_case.py b/src/python/grpcio_test/grpc_test/framework/base/interfaces_test_case.py
new file mode 100644
index 0000000000..be775ad4e0
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/base/interfaces_test_case.py
@@ -0,0 +1,307 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Abstract tests against the interfaces of the base layer of RPC Framework."""
+
+import threading
+import time
+
+from grpc.framework.base import interfaces
+from grpc.framework.base import util
+from grpc.framework.foundation import stream
+from grpc.framework.foundation import stream_util
+from grpc_test.framework.foundation import stream_testing
+
+TICK = 0.1
+SMALL_TIMEOUT = TICK * 50
+STREAM_LENGTH = 100
+
+SYNCHRONOUS_ECHO = 'synchronous echo'
+ASYNCHRONOUS_ECHO = 'asynchronous echo'
+IMMEDIATE_FAILURE = 'immediate failure'
+TRIGGERED_FAILURE = 'triggered failure'
+WAIT_ON_CONDITION = 'wait on condition'
+
+EMPTY_OUTCOME_DICT = {
+    interfaces.Outcome.COMPLETED: 0,
+    interfaces.Outcome.CANCELLED: 0,
+    interfaces.Outcome.EXPIRED: 0,
+    interfaces.Outcome.RECEPTION_FAILURE: 0,
+    interfaces.Outcome.TRANSMISSION_FAILURE: 0,
+    interfaces.Outcome.SERVICER_FAILURE: 0,
+    interfaces.Outcome.SERVICED_FAILURE: 0,
+    }
+
+
+def _synchronous_echo(output_consumer):
+  return stream_util.TransformingConsumer(lambda x: x, output_consumer)
+
+
+class AsynchronousEcho(stream.Consumer):
+  """A stream.Consumer that echoes its input to another stream.Consumer."""
+
+  def __init__(self, output_consumer, pool):
+    self._lock = threading.Lock()
+    self._output_consumer = output_consumer
+    self._pool = pool
+
+    self._queue = []
+    self._spinning = False
+
+  def _spin(self, value, complete):
+    while True:
+      if value:
+        if complete:
+          self._output_consumer.consume_and_terminate(value)
+        else:
+          self._output_consumer.consume(value)
+      elif complete:
+        self._output_consumer.terminate()
+      with self._lock:
+        if self._queue:
+          value, complete = self._queue.pop(0)
+        else:
+          self._spinning = False
+          return
+
+  def consume(self, value):
+    with self._lock:
+      if self._spinning:
+        self._queue.append((value, False))
+      else:
+        self._spinning = True
+        self._pool.submit(self._spin, value, False)
+
+  def terminate(self):
+    with self._lock:
+      if self._spinning:
+        self._queue.append((None, True))
+      else:
+        self._spinning = True
+        self._pool.submit(self._spin, None, True)
+
+  def consume_and_terminate(self, value):
+    with self._lock:
+      if self._spinning:
+        self._queue.append((value, True))
+      else:
+        self._spinning = True
+        self._pool.submit(self._spin, value, True)
+
+
+class TestServicer(interfaces.Servicer):
+  """An interfaces.Servicer with instrumented for testing."""
+
+  def __init__(self, pool):
+    self._pool = pool
+    self.condition = threading.Condition()
+    self._released = False
+
+  def service(self, name, context, output_consumer):
+    if name == SYNCHRONOUS_ECHO:
+      return _synchronous_echo(output_consumer)
+    elif name == ASYNCHRONOUS_ECHO:
+      return AsynchronousEcho(output_consumer, self._pool)
+    elif name == IMMEDIATE_FAILURE:
+      raise ValueError()
+    elif name == TRIGGERED_FAILURE:
+      raise NotImplementedError
+    elif name == WAIT_ON_CONDITION:
+      with self.condition:
+        while not self._released:
+          self.condition.wait()
+      return _synchronous_echo(output_consumer)
+    else:
+      raise NotImplementedError()
+
+  def release(self):
+    with self.condition:
+      self._released = True
+      self.condition.notify_all()
+
+
+class EasyServicedIngestor(interfaces.ServicedIngestor):
+  """A trivial implementation of interfaces.ServicedIngestor."""
+
+  def __init__(self, consumer):
+    self._consumer = consumer
+
+  def consumer(self, operation_context):
+    """See interfaces.ServicedIngestor.consumer for specification."""
+    return self._consumer
+
+
+class FrontAndBackTest(object):
+  """A test suite usable against any joined Front and Back."""
+
+  # Pylint doesn't know that this is a unittest.TestCase mix-in.
+  # pylint: disable=invalid-name
+
+  def testSimplestCall(self):
+    """Tests the absolute simplest call - a one-ticket fire-and-forget."""
+    self.front.operate(
+        SYNCHRONOUS_ECHO, None, True, SMALL_TIMEOUT,
+        util.none_serviced_subscription(), 'test trace ID')
+    util.wait_for_idle(self.front)
+    self.assertEqual(
+        1, self.front.operation_stats()[interfaces.Outcome.COMPLETED])
+
+    # Assuming nothing really pathological (such as pauses on the order of
+    # SMALL_TIMEOUT interfering with this test) there are a two different ways
+    # the back could have experienced execution up to this point:
+    # (1) The ticket is still either in the front waiting to be transmitted
+    # or is somewhere on the link between the front and the back. The back has
+    # no idea that this test is even happening. Calling wait_for_idle on it
+    # would do no good because in this case the back is idle and the call would
+    # return with the ticket bound for it still in the front or on the link.
+    back_operation_stats = self.back.operation_stats()
+    first_back_possibility = EMPTY_OUTCOME_DICT
+    # (2) The ticket arrived at the back and the back completed the operation.
+    second_back_possibility = dict(EMPTY_OUTCOME_DICT)
+    second_back_possibility[interfaces.Outcome.COMPLETED] = 1
+    self.assertIn(
+        back_operation_stats, (first_back_possibility, second_back_possibility))
+    # It's true that if the ticket had arrived at the back and the back had
+    # begun processing that wait_for_idle could hold test execution until the
+    # back completed the operation, but that doesn't really collapse the
+    # possibility space down to one solution.
+
+  def testEntireEcho(self):
+    """Tests a very simple one-ticket-each-way round-trip."""
+    test_payload = 'test payload'
+    test_consumer = stream_testing.TestConsumer()
+    subscription = util.full_serviced_subscription(
+        EasyServicedIngestor(test_consumer))
+
+    self.front.operate(
+        ASYNCHRONOUS_ECHO, test_payload, True, SMALL_TIMEOUT, subscription,
+        'test trace ID')
+
+    util.wait_for_idle(self.front)
+    util.wait_for_idle(self.back)
+    self.assertEqual(
+        1, self.front.operation_stats()[interfaces.Outcome.COMPLETED])
+    self.assertEqual(
+        1, self.back.operation_stats()[interfaces.Outcome.COMPLETED])
+    self.assertListEqual([(test_payload, True)], test_consumer.calls)
+
+  def testBidirectionalStreamingEcho(self):
+    """Tests sending multiple tickets each way."""
+    test_payload_template = 'test_payload: %03d'
+    test_payloads = [test_payload_template % i for i in range(STREAM_LENGTH)]
+    test_consumer = stream_testing.TestConsumer()
+    subscription = util.full_serviced_subscription(
+        EasyServicedIngestor(test_consumer))
+
+    operation = self.front.operate(
+        SYNCHRONOUS_ECHO, None, False, SMALL_TIMEOUT, subscription,
+        'test trace ID')
+
+    for test_payload in test_payloads:
+      operation.consumer.consume(test_payload)
+    operation.consumer.terminate()
+
+    util.wait_for_idle(self.front)
+    util.wait_for_idle(self.back)
+    self.assertEqual(
+        1, self.front.operation_stats()[interfaces.Outcome.COMPLETED])
+    self.assertEqual(
+        1, self.back.operation_stats()[interfaces.Outcome.COMPLETED])
+    self.assertListEqual(test_payloads, test_consumer.values())
+
+  def testCancellation(self):
+    """Tests cancelling a long-lived operation."""
+    test_consumer = stream_testing.TestConsumer()
+    subscription = util.full_serviced_subscription(
+        EasyServicedIngestor(test_consumer))
+
+    operation = self.front.operate(
+        ASYNCHRONOUS_ECHO, None, False, SMALL_TIMEOUT, subscription,
+        'test trace ID')
+    operation.cancel()
+
+    util.wait_for_idle(self.front)
+    self.assertEqual(
+        1, self.front.operation_stats()[interfaces.Outcome.CANCELLED])
+    util.wait_for_idle(self.back)
+    self.assertListEqual([], test_consumer.calls)
+
+    # Assuming nothing really pathological (such as pauses on the order of
+    # SMALL_TIMEOUT interfering with this test) there are a two different ways
+    # the back could have experienced execution up to this point:
+    # (1) Both tickets are still either in the front waiting to be transmitted
+    # or are somewhere on the link between the front and the back. The back has
+    # no idea that this test is even happening. Calling wait_for_idle on it
+    # would do no good because in this case the back is idle and the call would
+    # return with the tickets bound for it still in the front or on the link.
+    back_operation_stats = self.back.operation_stats()
+    first_back_possibility = EMPTY_OUTCOME_DICT
+    # (2) Both tickets arrived within SMALL_TIMEOUT of one another at the back.
+    # The back started processing based on the first ticket and then stopped
+    # upon receiving the cancellation ticket.
+    second_back_possibility = dict(EMPTY_OUTCOME_DICT)
+    second_back_possibility[interfaces.Outcome.CANCELLED] = 1
+    self.assertIn(
+        back_operation_stats, (first_back_possibility, second_back_possibility))
+
+  def testExpiration(self):
+    """Tests that operations time out."""
+    timeout = TICK * 2
+    allowance = TICK  # How much extra time to
+    condition = threading.Condition()
+    test_payload = 'test payload'
+    subscription = util.termination_only_serviced_subscription()
+    start_time = time.time()
+
+    outcome_cell = [None]
+    termination_time_cell = [None]
+    def termination_action(outcome):
+      with condition:
+        outcome_cell[0] = outcome
+        termination_time_cell[0] = time.time()
+        condition.notify()
+
+    with condition:
+      operation = self.front.operate(
+          SYNCHRONOUS_ECHO, test_payload, False, timeout, subscription,
+          'test trace ID')
+      operation.context.add_termination_callback(termination_action)
+      while outcome_cell[0] is None:
+        condition.wait()
+
+    duration = termination_time_cell[0] - start_time
+    self.assertLessEqual(timeout, duration)
+    self.assertLess(duration, timeout + allowance)
+    self.assertEqual(interfaces.Outcome.EXPIRED, outcome_cell[0])
+    util.wait_for_idle(self.front)
+    self.assertEqual(
+        1, self.front.operation_stats()[interfaces.Outcome.EXPIRED])
+    util.wait_for_idle(self.back)
+    self.assertLessEqual(
+        1, self.back.operation_stats()[interfaces.Outcome.EXPIRED])
diff --git a/src/python/grpcio_test/grpc_test/framework/common/__init__.py b/src/python/grpcio_test/grpc_test/framework/common/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/common/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/common/test_constants.py b/src/python/grpcio_test/grpc_test/framework/common/test_constants.py
new file mode 100644
index 0000000000..3126d0d82c
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/common/test_constants.py
@@ -0,0 +1,43 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Constants shared among tests throughout RPC Framework."""
+
+# Value for maximum duration in seconds of RPCs that may time out as part of a
+# test.
+SHORT_TIMEOUT = 4
+# Absurdly large value for maximum duration in seconds for should-not-time-out
+# RPCs made during tests.
+LONG_TIMEOUT = 3000
+
+# The number of payloads to transmit in streaming tests.
+STREAM_LENGTH = 200
+
+# The size of thread pools to use in tests.
+POOL_SIZE = 10
diff --git a/src/python/grpcio_test/grpc_test/framework/common/test_control.py b/src/python/grpcio_test/grpc_test/framework/common/test_control.py
new file mode 100644
index 0000000000..3960c4e649
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/common/test_control.py
@@ -0,0 +1,87 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Code for instructing systems under test to block or fail."""
+
+import abc
+import contextlib
+import threading
+
+
+class Control(object):
+  """An object that accepts program control from a system under test.
+
+  Systems under test passed a Control should call its control() method
+  frequently during execution. The control() method may block, raise an
+  exception, or do nothing, all according to the enclosing test's desire for
+  the system under test to simulate hanging, failing, or functioning.
+  """
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def control(self):
+    """Potentially does anything."""
+    raise NotImplementedError()
+
+
+class PauseFailControl(Control):
+  """A Control that can be used to pause or fail code under control."""
+
+  def __init__(self):
+    self._condition = threading.Condition()
+    self._paused = False
+    self._fail = False
+
+  def control(self):
+    with self._condition:
+      if self._fail:
+        raise ValueError()
+
+      while self._paused:
+        self._condition.wait()
+
+  @contextlib.contextmanager
+  def pause(self):
+    """Pauses code under control while controlling code is in context."""
+    with self._condition:
+      self._paused = True
+    yield
+    with self._condition:
+      self._paused = False
+      self._condition.notify_all()
+
+  @contextlib.contextmanager
+  def fail(self):
+    """Fails code under control while controlling code is in context."""
+    with self._condition:
+      self._fail = True
+    yield
+    with self._condition:
+      self._fail = False
diff --git a/src/python/grpcio_test/grpc_test/framework/common/test_coverage.py b/src/python/grpcio_test/grpc_test/framework/common/test_coverage.py
new file mode 100644
index 0000000000..a7ed3582c4
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/common/test_coverage.py
@@ -0,0 +1,116 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Governs coverage for tests of RPCs throughout RPC Framework."""
+
+import abc
+
+# This code is designed for use with the unittest module.
+# pylint: disable=invalid-name
+
+
+class Coverage(object):
+  """Specification of test coverage."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def testSuccessfulUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSuccessfulUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSuccessfulStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSuccessfulStreamRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSequentialInvocations(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testParallelInvocations(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testWaitingForSomeButNotAllParallelInvocations(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledStreamRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredStreamRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedStreamRequestStreamResponse(self):
+    raise NotImplementedError()
diff --git a/src/python/grpcio_test/grpc_test/framework/face/__init__.py b/src/python/grpcio_test/grpc_test/framework/face/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/face/_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/_test_case.py
new file mode 100644
index 0000000000..486b6e630e
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/_test_case.py
@@ -0,0 +1,61 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Common lifecycle code for in-memory-ticket-exchange Face-layer tests."""
+
+from grpc.framework.face import implementations
+from grpc.framework.foundation import logging_pool
+from grpc_test.framework.face.testing import base_util
+from grpc_test.framework.face.testing import test_case
+
+_TIMEOUT = 3
+_MAXIMUM_POOL_SIZE = 10
+
+
+class FaceTestCase(test_case.FaceTestCase):
+  """Provides abstract Face-layer tests an in-memory implementation."""
+
+  def set_up_implementation(
+      self, name, methods, method_implementations,
+      multi_method_implementation):
+    servicer_pool = logging_pool.pool(_MAXIMUM_POOL_SIZE)
+    stub_pool = logging_pool.pool(_MAXIMUM_POOL_SIZE)
+
+    servicer = implementations.servicer(
+        servicer_pool, method_implementations, multi_method_implementation)
+
+    linked_pair = base_util.linked_pair(servicer, _TIMEOUT)
+    stub = implementations.generic_stub(linked_pair.front, stub_pool)
+    return stub, (servicer_pool, stub_pool, linked_pair)
+
+  def tear_down_implementation(self, memo):
+    servicer_pool, stub_pool, linked_pair = memo
+    linked_pair.shut_down()
+    stub_pool.shutdown(wait=True)
+    servicer_pool.shutdown(wait=True)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/blocking_invocation_inline_service_test.py b/src/python/grpcio_test/grpc_test/framework/face/blocking_invocation_inline_service_test.py
new file mode 100644
index 0000000000..8674666418
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/blocking_invocation_inline_service_test.py
@@ -0,0 +1,46 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""One of the tests of the Face layer of RPC Framework."""
+
+import unittest
+
+from grpc_test.framework.face import _test_case
+from grpc_test.framework.face.testing import blocking_invocation_inline_service_test_case as test_case
+
+
+class BlockingInvocationInlineServiceTest(
+    _test_case.FaceTestCase,
+    test_case.BlockingInvocationInlineServiceTestCase,
+    unittest.TestCase):
+  pass
+
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/event_invocation_synchronous_event_service_test.py b/src/python/grpcio_test/grpc_test/framework/face/event_invocation_synchronous_event_service_test.py
new file mode 100644
index 0000000000..dca373ef7c
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/event_invocation_synchronous_event_service_test.py
@@ -0,0 +1,46 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""One of the tests of the Face layer of RPC Framework."""
+
+import unittest
+
+from grpc_test.framework.face import _test_case
+from grpc_test.framework.face.testing import event_invocation_synchronous_event_service_test_case as test_case
+
+
+class EventInvocationSynchronousEventServiceTest(
+    _test_case.FaceTestCase,
+    test_case.EventInvocationSynchronousEventServiceTestCase,
+    unittest.TestCase):
+  pass
+
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/future_invocation_asynchronous_event_service_test.py b/src/python/grpcio_test/grpc_test/framework/face/future_invocation_asynchronous_event_service_test.py
new file mode 100644
index 0000000000..99fdf18123
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/future_invocation_asynchronous_event_service_test.py
@@ -0,0 +1,46 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""One of the tests of the Face layer of RPC Framework."""
+
+import unittest
+
+from grpc_test.framework.face import _test_case
+from grpc_test.framework.face.testing import future_invocation_asynchronous_event_service_test_case as test_case
+
+
+class FutureInvocationAsynchronousEventServiceTest(
+    _test_case.FaceTestCase,
+    test_case.FutureInvocationAsynchronousEventServiceTestCase,
+    unittest.TestCase):
+  pass
+
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/__init__.py b/src/python/grpcio_test/grpc_test/framework/face/testing/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/base_util.py b/src/python/grpcio_test/grpc_test/framework/face/testing/base_util.py
new file mode 100644
index 0000000000..1df1529b27
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/base_util.py
@@ -0,0 +1,102 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Utilities for creating Base-layer objects for use in Face-layer tests."""
+
+import abc
+
+# interfaces is referenced from specification in this module.
+from grpc.framework.base import util as _base_util
+from grpc.framework.base import implementations
+from grpc.framework.base import in_memory
+from grpc.framework.base import interfaces  # pylint: disable=unused-import
+from grpc.framework.foundation import logging_pool
+
+_POOL_SIZE_LIMIT = 5
+
+_MAXIMUM_TIMEOUT = 90
+
+
+class LinkedPair(object):
+  """A Front and Back that are linked to one another.
+
+  Attributes:
+    front: An interfaces.Front.
+    back: An interfaces.Back.
+  """
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def shut_down(self):
+    """Shuts down this object and releases its resources."""
+    raise NotImplementedError()
+
+
+class _LinkedPair(LinkedPair):
+
+  def __init__(self, front, back, pools):
+    self.front = front
+    self.back = back
+    self._pools = pools
+
+  def shut_down(self):
+    _base_util.wait_for_idle(self.front)
+    _base_util.wait_for_idle(self.back)
+
+    for pool in self._pools:
+      pool.shutdown(wait=True)
+
+
+def linked_pair(servicer, default_timeout):
+  """Creates a Server and Stub linked together for use."""
+  link_pool = logging_pool.pool(_POOL_SIZE_LIMIT)
+  front_work_pool = logging_pool.pool(_POOL_SIZE_LIMIT)
+  front_transmission_pool = logging_pool.pool(_POOL_SIZE_LIMIT)
+  front_utility_pool = logging_pool.pool(_POOL_SIZE_LIMIT)
+  back_work_pool = logging_pool.pool(_POOL_SIZE_LIMIT)
+  back_transmission_pool = logging_pool.pool(_POOL_SIZE_LIMIT)
+  back_utility_pool = logging_pool.pool(_POOL_SIZE_LIMIT)
+  pools = (
+      link_pool,
+      front_work_pool, front_transmission_pool, front_utility_pool,
+      back_work_pool, back_transmission_pool, back_utility_pool)
+
+  link = in_memory.Link(link_pool)
+  front = implementations.front_link(
+      front_work_pool, front_transmission_pool, front_utility_pool)
+  back = implementations.back_link(
+      servicer, back_work_pool, back_transmission_pool, back_utility_pool,
+      default_timeout, _MAXIMUM_TIMEOUT)
+  front.join_rear_link(link)
+  link.join_fore_link(front)
+  back.join_fore_link(link)
+  link.join_rear_link(back)
+
+  return _LinkedPair(front, back, pools)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/blocking_invocation_inline_service_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/blocking_invocation_inline_service_test_case.py
new file mode 100644
index 0000000000..7e1158f96b
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/blocking_invocation_inline_service_test_case.py
@@ -0,0 +1,222 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""A test to verify an implementation of the Face layer of RPC Framework."""
+
+# unittest is referenced from specification in this module.
+import abc
+import unittest  # pylint: disable=unused-import
+
+from grpc.framework.face import exceptions
+from grpc_test.framework.face.testing import control
+from grpc_test.framework.face.testing import coverage
+from grpc_test.framework.face.testing import digest
+from grpc_test.framework.face.testing import stock_service
+from grpc_test.framework.face.testing import test_case
+
+_TIMEOUT = 3
+_LONG_TIMEOUT = 45
+
+
+class BlockingInvocationInlineServiceTestCase(
+    test_case.FaceTestCase, coverage.BlockingCoverage):
+  """A test of the Face layer of RPC Framework.
+
+  Concrete subclasses must also extend unittest.TestCase.
+  """
+  __metaclass__ = abc.ABCMeta
+
+  def setUp(self):
+    """See unittest.TestCase.setUp for full specification.
+
+    Overriding implementations must call this implementation.
+    """
+    self.control = control.PauseFailControl()
+    self.digest = digest.digest(
+        stock_service.STOCK_TEST_SERVICE, self.control, None)
+
+    self.stub, self.memo = self.set_up_implementation(
+        self.digest.name, self.digest.methods,
+        self.digest.inline_method_implementations, None)
+
+  def tearDown(self):
+    """See unittest.TestCase.tearDown for full specification.
+
+    Overriding implementations must call this implementation.
+    """
+    self.tear_down_implementation(self.memo)
+
+  def testSuccessfulUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        response = self.stub.blocking_value_in_value_out(
+            name, request, _LONG_TIMEOUT)
+
+        test_messages.verify(request, response, self)
+
+  def testSuccessfulUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        response_iterator = self.stub.inline_value_in_stream_out(
+            name, request, _LONG_TIMEOUT)
+        responses = list(response_iterator)
+
+        test_messages.verify(request, responses, self)
+
+  def testSuccessfulStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        response = self.stub.blocking_stream_in_value_out(
+            name, iter(requests), _LONG_TIMEOUT)
+
+        test_messages.verify(requests, response, self)
+
+  def testSuccessfulStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        response_iterator = self.stub.inline_stream_in_stream_out(
+            name, iter(requests), _LONG_TIMEOUT)
+        responses = list(response_iterator)
+
+        test_messages.verify(requests, responses, self)
+
+  def testSequentialInvocations(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        first_request = test_messages.request()
+        second_request = test_messages.request()
+
+        first_response = self.stub.blocking_value_in_value_out(
+            name, first_request, _TIMEOUT)
+
+        test_messages.verify(first_request, first_response, self)
+
+        second_response = self.stub.blocking_value_in_value_out(
+            name, second_request, _TIMEOUT)
+
+        test_messages.verify(second_request, second_response, self)
+
+  def testExpiredUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.pause(), self.assertRaises(
+            exceptions.ExpirationError):
+          multi_callable = self.stub.unary_unary_multi_callable(name)
+          multi_callable(request, _TIMEOUT)
+
+  def testExpiredUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.pause(), self.assertRaises(
+            exceptions.ExpirationError):
+          response_iterator = self.stub.inline_value_in_stream_out(
+              name, request, _TIMEOUT)
+          list(response_iterator)
+
+  def testExpiredStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.pause(), self.assertRaises(
+            exceptions.ExpirationError):
+          multi_callable = self.stub.stream_unary_multi_callable(name)
+          multi_callable(iter(requests), _TIMEOUT)
+
+  def testExpiredStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.pause(), self.assertRaises(
+            exceptions.ExpirationError):
+          response_iterator = self.stub.inline_stream_in_stream_out(
+              name, iter(requests), _TIMEOUT)
+          list(response_iterator)
+
+  def testFailedUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.fail(), self.assertRaises(exceptions.ServicerError):
+          self.stub.blocking_value_in_value_out(name, request, _TIMEOUT)
+
+  def testFailedUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.fail(), self.assertRaises(exceptions.ServicerError):
+          response_iterator = self.stub.inline_value_in_stream_out(
+              name, request, _TIMEOUT)
+          list(response_iterator)
+
+  def testFailedStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.fail(), self.assertRaises(exceptions.ServicerError):
+          self.stub.blocking_stream_in_value_out(name, iter(requests), _TIMEOUT)
+
+  def testFailedStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.fail(), self.assertRaises(exceptions.ServicerError):
+          response_iterator = self.stub.inline_stream_in_stream_out(
+              name, iter(requests), _TIMEOUT)
+          list(response_iterator)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/callback.py b/src/python/grpcio_test/grpc_test/framework/face/testing/callback.py
new file mode 100644
index 0000000000..d0e63c8c56
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/callback.py
@@ -0,0 +1,94 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""A utility useful in tests of asynchronous, event-driven interfaces."""
+
+import threading
+
+from grpc.framework.foundation import stream
+
+
+class Callback(stream.Consumer):
+  """A utility object useful in tests of asynchronous code."""
+
+  def __init__(self):
+    self._condition = threading.Condition()
+    self._unary_response = None
+    self._streamed_responses = []
+    self._completed = False
+    self._abortion = None
+
+  def abort(self, abortion):
+    with self._condition:
+      self._abortion = abortion
+      self._condition.notify_all()
+
+  def complete(self, unary_response):
+    with self._condition:
+      self._unary_response = unary_response
+      self._completed = True
+      self._condition.notify_all()
+
+  def consume(self, streamed_response):
+    with self._condition:
+      self._streamed_responses.append(streamed_response)
+
+  def terminate(self):
+    with self._condition:
+      self._completed = True
+      self._condition.notify_all()
+
+  def consume_and_terminate(self, streamed_response):
+    with self._condition:
+      self._streamed_responses.append(streamed_response)
+      self._completed = True
+      self._condition.notify_all()
+
+  def block_until_terminated(self):
+    with self._condition:
+      while self._abortion is None and not self._completed:
+        self._condition.wait()
+
+  def response(self):
+    with self._condition:
+      if self._abortion is None:
+        return self._unary_response
+      else:
+        raise AssertionError('Aborted with abortion "%s"!' % self._abortion)
+
+  def responses(self):
+    with self._condition:
+      if self._abortion is None:
+        return list(self._streamed_responses)
+      else:
+        raise AssertionError('Aborted with abortion "%s"!' % self._abortion)
+
+  def abortion(self):
+    with self._condition:
+      return self._abortion
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/control.py b/src/python/grpcio_test/grpc_test/framework/face/testing/control.py
new file mode 100644
index 0000000000..3960c4e649
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/control.py
@@ -0,0 +1,87 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Code for instructing systems under test to block or fail."""
+
+import abc
+import contextlib
+import threading
+
+
+class Control(object):
+  """An object that accepts program control from a system under test.
+
+  Systems under test passed a Control should call its control() method
+  frequently during execution. The control() method may block, raise an
+  exception, or do nothing, all according to the enclosing test's desire for
+  the system under test to simulate hanging, failing, or functioning.
+  """
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def control(self):
+    """Potentially does anything."""
+    raise NotImplementedError()
+
+
+class PauseFailControl(Control):
+  """A Control that can be used to pause or fail code under control."""
+
+  def __init__(self):
+    self._condition = threading.Condition()
+    self._paused = False
+    self._fail = False
+
+  def control(self):
+    with self._condition:
+      if self._fail:
+        raise ValueError()
+
+      while self._paused:
+        self._condition.wait()
+
+  @contextlib.contextmanager
+  def pause(self):
+    """Pauses code under control while controlling code is in context."""
+    with self._condition:
+      self._paused = True
+    yield
+    with self._condition:
+      self._paused = False
+      self._condition.notify_all()
+
+  @contextlib.contextmanager
+  def fail(self):
+    """Fails code under control while controlling code is in context."""
+    with self._condition:
+      self._fail = True
+    yield
+    with self._condition:
+      self._fail = False
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/coverage.py b/src/python/grpcio_test/grpc_test/framework/face/testing/coverage.py
new file mode 100644
index 0000000000..f3aca113fe
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/coverage.py
@@ -0,0 +1,123 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Governs coverage for the tests of the Face layer of RPC Framework."""
+
+import abc
+
+# These classes are only valid when inherited by unittest.TestCases.
+# pylint: disable=invalid-name
+
+
+class BlockingCoverage(object):
+  """Specification of test coverage for blocking behaviors."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def testSuccessfulUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSuccessfulUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSuccessfulStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSuccessfulStreamRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testSequentialInvocations(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testExpiredStreamRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testFailedStreamRequestStreamResponse(self):
+    raise NotImplementedError()
+
+
+class FullCoverage(BlockingCoverage):
+  """Specification of test coverage for non-blocking behaviors."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def testParallelInvocations(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testWaitingForSomeButNotAllParallelInvocations(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledUnaryRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledUnaryRequestStreamResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledStreamRequestUnaryResponse(self):
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def testCancelledStreamRequestStreamResponse(self):
+    raise NotImplementedError()
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/digest.py b/src/python/grpcio_test/grpc_test/framework/face/testing/digest.py
new file mode 100644
index 0000000000..54ff21779a
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/digest.py
@@ -0,0 +1,450 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Code for making a service.TestService more amenable to use in tests."""
+
+import collections
+import threading
+
+# testing_control, interfaces, and testing_service are referenced from
+# specification in this module.
+from grpc.framework.common import cardinality
+from grpc.framework.common import style
+from grpc.framework.face import exceptions
+from grpc.framework.face import interfaces as face_interfaces
+from grpc.framework.foundation import stream
+from grpc.framework.foundation import stream_util
+from grpc_test.framework.face.testing import control as testing_control  # pylint: disable=unused-import
+from grpc_test.framework.face.testing import interfaces  # pylint: disable=unused-import
+from grpc_test.framework.face.testing import service as testing_service  # pylint: disable=unused-import
+
+_IDENTITY = lambda x: x
+
+
+class TestServiceDigest(
+    collections.namedtuple(
+        'TestServiceDigest',
+        ['name',
+         'methods',
+         'inline_method_implementations',
+         'event_method_implementations',
+         'multi_method_implementation',
+         'unary_unary_messages_sequences',
+         'unary_stream_messages_sequences',
+         'stream_unary_messages_sequences',
+         'stream_stream_messages_sequences'])):
+  """A transformation of a service.TestService.
+
+  Attributes:
+    name: The RPC service name to be used in the test.
+    methods: A sequence of interfaces.Method objects describing the RPC
+      methods that will be called during the test.
+    inline_method_implementations: A dict from RPC method name to
+      face_interfaces.MethodImplementation object to be used in tests of
+      in-line calls to behaviors under test.
+    event_method_implementations: A dict from RPC method name to
+      face_interfaces.MethodImplementation object to be used in tests of
+      event-driven calls to behaviors under test.
+    multi_method_implementation: A face_interfaces.MultiMethodImplementation to
+      be used in tests of generic calls to behaviors under test.
+    unary_unary_messages_sequences: A dict from method name to sequence of
+      service.UnaryUnaryTestMessages objects to be used to test the method
+      with the given name.
+    unary_stream_messages_sequences: A dict from method name to sequence of
+      service.UnaryStreamTestMessages objects to be used to test the method
+      with the given name.
+    stream_unary_messages_sequences: A dict from method name to sequence of
+      service.StreamUnaryTestMessages objects to be used to test the method
+      with the given name.
+    stream_stream_messages_sequences: A dict from method name to sequence of
+      service.StreamStreamTestMessages objects to be used to test the
+      method with the given name.
+    serialization: A serial.Serialization object describing serialization
+      behaviors for all the RPC methods.
+  """
+
+
+class _BufferingConsumer(stream.Consumer):
+  """A trivial Consumer that dumps what it consumes in a user-mutable buffer."""
+
+  def __init__(self):
+    self.consumed = []
+    self.terminated = False
+
+  def consume(self, value):
+    self.consumed.append(value)
+
+  def terminate(self):
+    self.terminated = True
+
+  def consume_and_terminate(self, value):
+    self.consumed.append(value)
+    self.terminated = True
+
+
+class _InlineUnaryUnaryMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, unary_unary_test_method, control):
+    self._test_method = unary_unary_test_method
+    self._control = control
+
+    self.cardinality = cardinality.Cardinality.UNARY_UNARY
+    self.style = style.Service.INLINE
+
+  def unary_unary_inline(self, request, context):
+    response_list = []
+    self._test_method.service(
+        request, response_list.append, context, self._control)
+    return response_list.pop(0)
+
+
+class _EventUnaryUnaryMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, unary_unary_test_method, control, pool):
+    self._test_method = unary_unary_test_method
+    self._control = control
+    self._pool = pool
+
+    self.cardinality = cardinality.Cardinality.UNARY_UNARY
+    self.style = style.Service.EVENT
+
+  def unary_unary_event(self, request, response_callback, context):
+    if self._pool is None:
+      self._test_method.service(
+          request, response_callback, context, self._control)
+    else:
+      self._pool.submit(
+          self._test_method.service, request, response_callback, context,
+          self._control)
+
+
+class _InlineUnaryStreamMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, unary_stream_test_method, control):
+    self._test_method = unary_stream_test_method
+    self._control = control
+
+    self.cardinality = cardinality.Cardinality.UNARY_STREAM
+    self.style = style.Service.INLINE
+
+  def unary_stream_inline(self, request, context):
+    response_consumer = _BufferingConsumer()
+    self._test_method.service(
+        request, response_consumer, context, self._control)
+    for response in response_consumer.consumed:
+      yield response
+
+
+class _EventUnaryStreamMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, unary_stream_test_method, control, pool):
+    self._test_method = unary_stream_test_method
+    self._control = control
+    self._pool = pool
+
+    self.cardinality = cardinality.Cardinality.UNARY_STREAM
+    self.style = style.Service.EVENT
+
+  def unary_stream_event(self, request, response_consumer, context):
+    if self._pool is None:
+      self._test_method.service(
+          request, response_consumer, context, self._control)
+    else:
+      self._pool.submit(
+          self._test_method.service, request, response_consumer, context,
+          self._control)
+
+
+class _InlineStreamUnaryMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, stream_unary_test_method, control):
+    self._test_method = stream_unary_test_method
+    self._control = control
+
+    self.cardinality = cardinality.Cardinality.STREAM_UNARY
+    self.style = style.Service.INLINE
+
+  def stream_unary_inline(self, request_iterator, context):
+    response_list = []
+    request_consumer = self._test_method.service(
+        response_list.append, context, self._control)
+    for request in request_iterator:
+      request_consumer.consume(request)
+    request_consumer.terminate()
+    return response_list.pop(0)
+
+
+class _EventStreamUnaryMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, stream_unary_test_method, control, pool):
+    self._test_method = stream_unary_test_method
+    self._control = control
+    self._pool = pool
+
+    self.cardinality = cardinality.Cardinality.STREAM_UNARY
+    self.style = style.Service.EVENT
+
+  def stream_unary_event(self, response_callback, context):
+    request_consumer = self._test_method.service(
+        response_callback, context, self._control)
+    if self._pool is None:
+      return request_consumer
+    else:
+      return stream_util.ThreadSwitchingConsumer(request_consumer, self._pool)
+
+
+class _InlineStreamStreamMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, stream_stream_test_method, control):
+    self._test_method = stream_stream_test_method
+    self._control = control
+
+    self.cardinality = cardinality.Cardinality.STREAM_STREAM
+    self.style = style.Service.INLINE
+
+  def stream_stream_inline(self, request_iterator, context):
+    response_consumer = _BufferingConsumer()
+    request_consumer = self._test_method.service(
+        response_consumer, context, self._control)
+
+    for request in request_iterator:
+      request_consumer.consume(request)
+      while response_consumer.consumed:
+        yield response_consumer.consumed.pop(0)
+    response_consumer.terminate()
+
+
+class _EventStreamStreamMethod(face_interfaces.MethodImplementation):
+
+  def __init__(self, stream_stream_test_method, control, pool):
+    self._test_method = stream_stream_test_method
+    self._control = control
+    self._pool = pool
+
+    self.cardinality = cardinality.Cardinality.STREAM_STREAM
+    self.style = style.Service.EVENT
+
+  def stream_stream_event(self, response_consumer, context):
+    request_consumer = self._test_method.service(
+        response_consumer, context, self._control)
+    if self._pool is None:
+      return request_consumer
+    else:
+      return stream_util.ThreadSwitchingConsumer(request_consumer, self._pool)
+
+
+class _UnaryConsumer(stream.Consumer):
+  """A Consumer that only allows consumption of exactly one value."""
+
+  def __init__(self, action):
+    self._lock = threading.Lock()
+    self._action = action
+    self._consumed = False
+    self._terminated = False
+
+  def consume(self, value):
+    with self._lock:
+      if self._consumed:
+        raise ValueError('Unary consumer already consumed!')
+      elif self._terminated:
+        raise ValueError('Unary consumer already terminated!')
+      else:
+        self._consumed = True
+
+    self._action(value)
+
+  def terminate(self):
+    with self._lock:
+      if not self._consumed:
+        raise ValueError('Unary consumer hasn\'t yet consumed!')
+      elif self._terminated:
+        raise ValueError('Unary consumer already terminated!')
+      else:
+        self._terminated = True
+
+  def consume_and_terminate(self, value):
+    with self._lock:
+      if self._consumed:
+        raise ValueError('Unary consumer already consumed!')
+      elif self._terminated:
+        raise ValueError('Unary consumer already terminated!')
+      else:
+        self._consumed = True
+        self._terminated = True
+
+    self._action(value)
+
+
+class _UnaryUnaryAdaptation(object):
+
+  def __init__(self, unary_unary_test_method):
+    self._method = unary_unary_test_method
+
+  def service(self, response_consumer, context, control):
+    def action(request):
+      self._method.service(
+          request, response_consumer.consume_and_terminate, context, control)
+    return _UnaryConsumer(action)
+
+
+class _UnaryStreamAdaptation(object):
+
+  def __init__(self, unary_stream_test_method):
+    self._method = unary_stream_test_method
+
+  def service(self, response_consumer, context, control):
+    def action(request):
+      self._method.service(request, response_consumer, context, control)
+    return _UnaryConsumer(action)
+
+
+class _StreamUnaryAdaptation(object):
+
+  def __init__(self, stream_unary_test_method):
+    self._method = stream_unary_test_method
+
+  def service(self, response_consumer, context, control):
+    return self._method.service(
+        response_consumer.consume_and_terminate, context, control)
+
+
+class _MultiMethodImplementation(face_interfaces.MultiMethodImplementation):
+
+  def __init__(self, methods, control, pool):
+    self._methods = methods
+    self._control = control
+    self._pool = pool
+
+  def service(self, name, response_consumer, context):
+    method = self._methods.get(name, None)
+    if method is None:
+      raise exceptions.NoSuchMethodError(name)
+    elif self._pool is None:
+      return method(response_consumer, context, self._control)
+    else:
+      request_consumer = method(response_consumer, context, self._control)
+      return stream_util.ThreadSwitchingConsumer(request_consumer, self._pool)
+
+
+class _Assembly(
+    collections.namedtuple(
+        '_Assembly',
+        ['methods', 'inlines', 'events', 'adaptations', 'messages'])):
+  """An intermediate structure created when creating a TestServiceDigest."""
+
+
+def _assemble(
+    scenarios, names, inline_method_constructor, event_method_constructor,
+    adapter, control, pool):
+  """Creates an _Assembly from the given scenarios."""
+  methods = []
+  inlines = {}
+  events = {}
+  adaptations = {}
+  messages = {}
+  for name, scenario in scenarios.iteritems():
+    if name in names:
+      raise ValueError('Repeated name "%s"!' % name)
+
+    test_method = scenario[0]
+    inline_method = inline_method_constructor(test_method, control)
+    event_method = event_method_constructor(test_method, control, pool)
+    adaptation = adapter(test_method)
+
+    methods.append(test_method)
+    inlines[name] = inline_method
+    events[name] = event_method
+    adaptations[name] = adaptation
+    messages[name] = scenario[1]
+
+  return _Assembly(methods, inlines, events, adaptations, messages)
+
+
+def digest(service, control, pool):
+  """Creates a TestServiceDigest from a TestService.
+
+  Args:
+    service: A testing_service.TestService.
+    control: A testing_control.Control.
+    pool: If RPC methods should be serviced in a separate thread, a thread pool.
+      None if RPC methods should be serviced in the thread belonging to the
+      run-time that calls for their service.
+
+  Returns:
+    A TestServiceDigest synthesized from the given service.TestService.
+  """
+  names = set()
+
+  unary_unary = _assemble(
+      service.unary_unary_scenarios(), names, _InlineUnaryUnaryMethod,
+      _EventUnaryUnaryMethod, _UnaryUnaryAdaptation, control, pool)
+  names.update(set(unary_unary.inlines))
+
+  unary_stream = _assemble(
+      service.unary_stream_scenarios(), names, _InlineUnaryStreamMethod,
+      _EventUnaryStreamMethod, _UnaryStreamAdaptation, control, pool)
+  names.update(set(unary_stream.inlines))
+
+  stream_unary = _assemble(
+      service.stream_unary_scenarios(), names, _InlineStreamUnaryMethod,
+      _EventStreamUnaryMethod, _StreamUnaryAdaptation, control, pool)
+  names.update(set(stream_unary.inlines))
+
+  stream_stream = _assemble(
+      service.stream_stream_scenarios(), names, _InlineStreamStreamMethod,
+      _EventStreamStreamMethod, _IDENTITY, control, pool)
+  names.update(set(stream_stream.inlines))
+
+  methods = list(unary_unary.methods)
+  methods.extend(unary_stream.methods)
+  methods.extend(stream_unary.methods)
+  methods.extend(stream_stream.methods)
+  adaptations = dict(unary_unary.adaptations)
+  adaptations.update(unary_stream.adaptations)
+  adaptations.update(stream_unary.adaptations)
+  adaptations.update(stream_stream.adaptations)
+  inlines = dict(unary_unary.inlines)
+  inlines.update(unary_stream.inlines)
+  inlines.update(stream_unary.inlines)
+  inlines.update(stream_stream.inlines)
+  events = dict(unary_unary.events)
+  events.update(unary_stream.events)
+  events.update(stream_unary.events)
+  events.update(stream_stream.events)
+
+  return TestServiceDigest(
+      service.name(),
+      methods,
+      inlines,
+      events,
+      _MultiMethodImplementation(adaptations, control, pool),
+      unary_unary.messages,
+      unary_stream.messages,
+      stream_unary.messages,
+      stream_stream.messages)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/event_invocation_synchronous_event_service_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/event_invocation_synchronous_event_service_test_case.py
new file mode 100644
index 0000000000..18eed53d6e
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/event_invocation_synchronous_event_service_test_case.py
@@ -0,0 +1,362 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""A test to verify an implementation of the Face layer of RPC Framework."""
+
+import abc
+import unittest
+
+from grpc.framework.face import interfaces
+from grpc_test.framework.face.testing import callback as testing_callback
+from grpc_test.framework.face.testing import control
+from grpc_test.framework.face.testing import coverage
+from grpc_test.framework.face.testing import digest
+from grpc_test.framework.face.testing import stock_service
+from grpc_test.framework.face.testing import test_case
+
+_TIMEOUT = 3
+
+
+class EventInvocationSynchronousEventServiceTestCase(
+    test_case.FaceTestCase, coverage.FullCoverage):
+  """A test of the Face layer of RPC Framework.
+
+  Concrete subclasses must also extend unittest.TestCase.
+  """
+  __metaclass__ = abc.ABCMeta
+
+  def setUp(self):
+    """See unittest.TestCase.setUp for full specification.
+
+    Overriding implementations must call this implementation.
+    """
+    self.control = control.PauseFailControl()
+    self.digest = digest.digest(
+        stock_service.STOCK_TEST_SERVICE, self.control, None)
+
+    self.stub, self.memo = self.set_up_implementation(
+        self.digest.name, self.digest.methods,
+        self.digest.event_method_implementations, None)
+
+  def tearDown(self):
+    """See unittest.TestCase.tearDown for full specification.
+
+    Overriding implementations must call this implementation.
+    """
+    self.tear_down_implementation(self.memo)
+
+  def testSuccessfulUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        self.stub.event_value_in_value_out(
+            name, request, callback.complete, callback.abort, _TIMEOUT)
+        callback.block_until_terminated()
+        response = callback.response()
+
+        test_messages.verify(request, response, self)
+
+  def testSuccessfulUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        self.stub.event_value_in_stream_out(
+            name, request, callback, callback.abort, _TIMEOUT)
+        callback.block_until_terminated()
+        responses = callback.responses()
+
+        test_messages.verify(request, responses, self)
+
+  def testSuccessfulStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        callback = testing_callback.Callback()
+
+        unused_call, request_consumer = self.stub.event_stream_in_value_out(
+            name, callback.complete, callback.abort, _TIMEOUT)
+        for request in requests:
+          request_consumer.consume(request)
+        request_consumer.terminate()
+        callback.block_until_terminated()
+        response = callback.response()
+
+        test_messages.verify(requests, response, self)
+
+  def testSuccessfulStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        callback = testing_callback.Callback()
+
+        unused_call, request_consumer = self.stub.event_stream_in_stream_out(
+            name, callback, callback.abort, _TIMEOUT)
+        for request in requests:
+          request_consumer.consume(request)
+        request_consumer.terminate()
+        callback.block_until_terminated()
+        responses = callback.responses()
+
+        test_messages.verify(requests, responses, self)
+
+  def testSequentialInvocations(self):
+    # pylint: disable=cell-var-from-loop
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        first_request = test_messages.request()
+        second_request = test_messages.request()
+        first_callback = testing_callback.Callback()
+        second_callback = testing_callback.Callback()
+
+        def make_second_invocation(first_response):
+          first_callback.complete(first_response)
+          self.stub.event_value_in_value_out(
+              name, second_request, second_callback.complete,
+              second_callback.abort, _TIMEOUT)
+
+        self.stub.event_value_in_value_out(
+            name, first_request, make_second_invocation, first_callback.abort,
+            _TIMEOUT)
+        second_callback.block_until_terminated()
+
+        first_response = first_callback.response()
+        second_response = second_callback.response()
+        test_messages.verify(first_request, first_response, self)
+        test_messages.verify(second_request, second_response, self)
+
+  def testExpiredUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        with self.control.pause():
+          self.stub.event_value_in_value_out(
+              name, request, callback.complete, callback.abort, _TIMEOUT)
+          callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.EXPIRED, callback.abortion())
+
+  def testExpiredUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        with self.control.pause():
+          self.stub.event_value_in_stream_out(
+              name, request, callback, callback.abort, _TIMEOUT)
+          callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.EXPIRED, callback.abortion())
+
+  def testExpiredStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for unused_test_messages in test_messages_sequence:
+        callback = testing_callback.Callback()
+
+        self.stub.event_stream_in_value_out(
+            name, callback.complete, callback.abort, _TIMEOUT)
+        callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.EXPIRED, callback.abortion())
+
+  def testExpiredStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        callback = testing_callback.Callback()
+
+        unused_call, request_consumer = self.stub.event_stream_in_stream_out(
+            name, callback, callback.abort, _TIMEOUT)
+        for request in requests:
+          request_consumer.consume(request)
+        callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.EXPIRED, callback.abortion())
+
+  def testFailedUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        with self.control.fail():
+          self.stub.event_value_in_value_out(
+              name, request, callback.complete, callback.abort, _TIMEOUT)
+          callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.SERVICER_FAILURE, callback.abortion())
+
+  def testFailedUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        with self.control.fail():
+          self.stub.event_value_in_stream_out(
+              name, request, callback, callback.abort, _TIMEOUT)
+          callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.SERVICER_FAILURE, callback.abortion())
+
+  def testFailedStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        callback = testing_callback.Callback()
+
+        with self.control.fail():
+          unused_call, request_consumer = self.stub.event_stream_in_value_out(
+              name, callback.complete, callback.abort, _TIMEOUT)
+          for request in requests:
+            request_consumer.consume(request)
+          request_consumer.terminate()
+          callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.SERVICER_FAILURE, callback.abortion())
+
+  def testFailedStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        callback = testing_callback.Callback()
+
+        with self.control.fail():
+          unused_call, request_consumer = self.stub.event_stream_in_stream_out(
+              name, callback, callback.abort, _TIMEOUT)
+          for request in requests:
+            request_consumer.consume(request)
+          request_consumer.terminate()
+          callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.SERVICER_FAILURE, callback.abortion())
+
+  def testParallelInvocations(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        first_request = test_messages.request()
+        first_callback = testing_callback.Callback()
+        second_request = test_messages.request()
+        second_callback = testing_callback.Callback()
+
+        self.stub.event_value_in_value_out(
+            name, first_request, first_callback.complete, first_callback.abort,
+            _TIMEOUT)
+        self.stub.event_value_in_value_out(
+            name, second_request, second_callback.complete,
+            second_callback.abort, _TIMEOUT)
+        first_callback.block_until_terminated()
+        second_callback.block_until_terminated()
+
+        first_response = first_callback.response()
+        second_response = second_callback.response()
+        test_messages.verify(first_request, first_response, self)
+        test_messages.verify(second_request, second_response, self)
+
+  @unittest.skip('TODO(nathaniel): implement.')
+  def testWaitingForSomeButNotAllParallelInvocations(self):
+    raise NotImplementedError()
+
+  def testCancelledUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        with self.control.pause():
+          call = self.stub.event_value_in_value_out(
+              name, request, callback.complete, callback.abort, _TIMEOUT)
+          call.cancel()
+          callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.CANCELLED, callback.abortion())
+
+  def testCancelledUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+        callback = testing_callback.Callback()
+
+        call = self.stub.event_value_in_stream_out(
+            name, request, callback, callback.abort, _TIMEOUT)
+        call.cancel()
+        callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.CANCELLED, callback.abortion())
+
+  def testCancelledStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        callback = testing_callback.Callback()
+
+        call, request_consumer = self.stub.event_stream_in_value_out(
+            name, callback.complete, callback.abort, _TIMEOUT)
+        for request in requests:
+          request_consumer.consume(request)
+        call.cancel()
+        callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.CANCELLED, callback.abortion())
+
+  def testCancelledStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for unused_test_messages in test_messages_sequence:
+        callback = testing_callback.Callback()
+
+        call, unused_request_consumer = self.stub.event_stream_in_stream_out(
+            name, callback, callback.abort, _TIMEOUT)
+        call.cancel()
+        callback.block_until_terminated()
+
+        self.assertEqual(interfaces.Abortion.CANCELLED, callback.abortion())
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/future_invocation_asynchronous_event_service_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/future_invocation_asynchronous_event_service_test_case.py
new file mode 100644
index 0000000000..3b42914342
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/future_invocation_asynchronous_event_service_test_case.py
@@ -0,0 +1,376 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""A test to verify an implementation of the Face layer of RPC Framework."""
+
+import abc
+import contextlib
+import threading
+import unittest
+
+from grpc.framework.face import exceptions
+from grpc.framework.foundation import future
+from grpc.framework.foundation import logging_pool
+from grpc_test.framework.face.testing import control
+from grpc_test.framework.face.testing import coverage
+from grpc_test.framework.face.testing import digest
+from grpc_test.framework.face.testing import stock_service
+from grpc_test.framework.face.testing import test_case
+
+_TIMEOUT = 3
+_MAXIMUM_POOL_SIZE = 10
+
+
+class _PauseableIterator(object):
+
+  def __init__(self, upstream):
+    self._upstream = upstream
+    self._condition = threading.Condition()
+    self._paused = False
+
+  @contextlib.contextmanager
+  def pause(self):
+    with self._condition:
+      self._paused = True
+    yield
+    with self._condition:
+      self._paused = False
+      self._condition.notify_all()
+
+  def __iter__(self):
+    return self
+
+  def next(self):
+    with self._condition:
+      while self._paused:
+        self._condition.wait()
+    return next(self._upstream)
+
+
+class FutureInvocationAsynchronousEventServiceTestCase(
+    test_case.FaceTestCase, coverage.FullCoverage):
+  """A test of the Face layer of RPC Framework.
+
+  Concrete subclasses must also extend unittest.TestCase.
+  """
+  __metaclass__ = abc.ABCMeta
+
+  def setUp(self):
+    """See unittest.TestCase.setUp for full specification.
+
+    Overriding implementations must call this implementation.
+    """
+    self.control = control.PauseFailControl()
+    self.digest_pool = logging_pool.pool(_MAXIMUM_POOL_SIZE)
+    self.digest = digest.digest(
+        stock_service.STOCK_TEST_SERVICE, self.control, self.digest_pool)
+
+    self.stub, self.memo = self.set_up_implementation(
+        self.digest.name, self.digest.methods,
+        self.digest.event_method_implementations, None)
+
+  def tearDown(self):
+    """See unittest.TestCase.tearDown for full specification.
+
+    Overriding implementations must call this implementation.
+    """
+    self.tear_down_implementation(self.memo)
+    self.digest_pool.shutdown(wait=True)
+
+  def testSuccessfulUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        response_future = self.stub.future_value_in_value_out(
+            name, request, _TIMEOUT)
+        response = response_future.result()
+
+        test_messages.verify(request, response, self)
+
+  def testSuccessfulUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        response_iterator = self.stub.inline_value_in_stream_out(
+            name, request, _TIMEOUT)
+        responses = list(response_iterator)
+
+        test_messages.verify(request, responses, self)
+
+  def testSuccessfulStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        request_iterator = _PauseableIterator(iter(requests))
+
+        # Use of a paused iterator of requests allows us to test that control is
+        # returned to calling code before the iterator yields any requests.
+        with request_iterator.pause():
+          response_future = self.stub.future_stream_in_value_out(
+              name, request_iterator, _TIMEOUT)
+        response = response_future.result()
+
+        test_messages.verify(requests, response, self)
+
+  def testSuccessfulStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+        request_iterator = _PauseableIterator(iter(requests))
+
+        # Use of a paused iterator of requests allows us to test that control is
+        # returned to calling code before the iterator yields any requests.
+        with request_iterator.pause():
+          response_iterator = self.stub.inline_stream_in_stream_out(
+              name, request_iterator, _TIMEOUT)
+        responses = list(response_iterator)
+
+        test_messages.verify(requests, responses, self)
+
+  def testSequentialInvocations(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        first_request = test_messages.request()
+        second_request = test_messages.request()
+
+        first_response_future = self.stub.future_value_in_value_out(
+            name, first_request, _TIMEOUT)
+        first_response = first_response_future.result()
+
+        test_messages.verify(first_request, first_response, self)
+
+        second_response_future = self.stub.future_value_in_value_out(
+            name, second_request, _TIMEOUT)
+        second_response = second_response_future.result()
+
+        test_messages.verify(second_request, second_response, self)
+
+  def testExpiredUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.pause():
+          multi_callable = self.stub.unary_unary_multi_callable(name)
+          response_future = multi_callable.future(request, _TIMEOUT)
+          self.assertIsInstance(
+              response_future.exception(), exceptions.ExpirationError)
+          with self.assertRaises(exceptions.ExpirationError):
+            response_future.result()
+
+  def testExpiredUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.pause():
+          response_iterator = self.stub.inline_value_in_stream_out(
+              name, request, _TIMEOUT)
+          with self.assertRaises(exceptions.ExpirationError):
+            list(response_iterator)
+
+  def testExpiredStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.pause():
+          multi_callable = self.stub.stream_unary_multi_callable(name)
+          response_future = multi_callable.future(iter(requests), _TIMEOUT)
+          self.assertIsInstance(
+              response_future.exception(), exceptions.ExpirationError)
+          with self.assertRaises(exceptions.ExpirationError):
+            response_future.result()
+
+  def testExpiredStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.pause():
+          response_iterator = self.stub.inline_stream_in_stream_out(
+              name, iter(requests), _TIMEOUT)
+          with self.assertRaises(exceptions.ExpirationError):
+            list(response_iterator)
+
+  def testFailedUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.fail():
+          response_future = self.stub.future_value_in_value_out(
+              name, request, _TIMEOUT)
+
+          # Because the servicer fails outside of the thread from which the
+          # servicer-side runtime called into it its failure is
+          # indistinguishable from simply not having called its
+          # response_callback before the expiration of the RPC.
+          self.assertIsInstance(
+              response_future.exception(), exceptions.ExpirationError)
+          with self.assertRaises(exceptions.ExpirationError):
+            response_future.result()
+
+  def testFailedUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        # Because the servicer fails outside of the thread from which the
+        # servicer-side runtime called into it its failure is indistinguishable
+        # from simply not having called its response_consumer before the
+        # expiration of the RPC.
+        with self.control.fail(), self.assertRaises(exceptions.ExpirationError):
+          response_iterator = self.stub.inline_value_in_stream_out(
+              name, request, _TIMEOUT)
+          list(response_iterator)
+
+  def testFailedStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.fail():
+          response_future = self.stub.future_stream_in_value_out(
+              name, iter(requests), _TIMEOUT)
+
+          # Because the servicer fails outside of the thread from which the
+          # servicer-side runtime called into it its failure is
+          # indistinguishable from simply not having called its
+          # response_callback before the expiration of the RPC.
+          self.assertIsInstance(
+              response_future.exception(), exceptions.ExpirationError)
+          with self.assertRaises(exceptions.ExpirationError):
+            response_future.result()
+
+  def testFailedStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        # Because the servicer fails outside of the thread from which the
+        # servicer-side runtime called into it its failure is indistinguishable
+        # from simply not having called its response_consumer before the
+        # expiration of the RPC.
+        with self.control.fail(), self.assertRaises(exceptions.ExpirationError):
+          response_iterator = self.stub.inline_stream_in_stream_out(
+              name, iter(requests), _TIMEOUT)
+          list(response_iterator)
+
+  def testParallelInvocations(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        first_request = test_messages.request()
+        second_request = test_messages.request()
+
+        first_response_future = self.stub.future_value_in_value_out(
+            name, first_request, _TIMEOUT)
+        second_response_future = self.stub.future_value_in_value_out(
+            name, second_request, _TIMEOUT)
+        first_response = first_response_future.result()
+        second_response = second_response_future.result()
+
+        test_messages.verify(first_request, first_response, self)
+        test_messages.verify(second_request, second_response, self)
+
+  @unittest.skip('TODO(nathaniel): implement.')
+  def testWaitingForSomeButNotAllParallelInvocations(self):
+    raise NotImplementedError()
+
+  def testCancelledUnaryRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.pause():
+          response_future = self.stub.future_value_in_value_out(
+              name, request, _TIMEOUT)
+          cancel_method_return_value = response_future.cancel()
+
+        self.assertFalse(cancel_method_return_value)
+        self.assertTrue(response_future.cancelled())
+
+  def testCancelledUnaryRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.unary_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        request = test_messages.request()
+
+        with self.control.pause():
+          response_iterator = self.stub.inline_value_in_stream_out(
+              name, request, _TIMEOUT)
+          response_iterator.cancel()
+
+        with self.assertRaises(future.CancelledError):
+          next(response_iterator)
+
+  def testCancelledStreamRequestUnaryResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_unary_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.pause():
+          response_future = self.stub.future_stream_in_value_out(
+              name, iter(requests), _TIMEOUT)
+          cancel_method_return_value = response_future.cancel()
+
+        self.assertFalse(cancel_method_return_value)
+        self.assertTrue(response_future.cancelled())
+
+  def testCancelledStreamRequestStreamResponse(self):
+    for name, test_messages_sequence in (
+        self.digest.stream_stream_messages_sequences.iteritems()):
+      for test_messages in test_messages_sequence:
+        requests = test_messages.requests()
+
+        with self.control.pause():
+          response_iterator = self.stub.inline_stream_in_stream_out(
+              name, iter(requests), _TIMEOUT)
+          response_iterator.cancel()
+
+        with self.assertRaises(future.CancelledError):
+          next(response_iterator)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/interfaces.py b/src/python/grpcio_test/grpc_test/framework/face/testing/interfaces.py
new file mode 100644
index 0000000000..5932dabf1e
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/interfaces.py
@@ -0,0 +1,117 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Interfaces implemented by data sets used in Face-layer tests."""
+
+import abc
+
+# cardinality is referenced from specification in this module.
+from grpc.framework.common import cardinality  # pylint: disable=unused-import
+
+
+class Method(object):
+  """An RPC method to be used in tests of RPC implementations."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def name(self):
+    """Identify the name of the method.
+
+    Returns:
+      The name of the method.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def cardinality(self):
+    """Identify the cardinality of the method.
+
+    Returns:
+      A cardinality.Cardinality value describing the streaming semantics of the
+        method.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def request_class(self):
+    """Identify the class used for the method's request objects.
+
+    Returns:
+      The class object of the class to which the method's request objects
+        belong.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def response_class(self):
+    """Identify the class used for the method's response objects.
+
+    Returns:
+      The class object of the class to which the method's response objects
+        belong.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def serialize_request(self, request):
+    """Serialize the given request object.
+
+    Args:
+      request: A request object appropriate for this method.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def deserialize_request(self, serialized_request):
+    """Synthesize a request object from a given bytestring.
+
+    Args:
+      serialized_request: A bytestring deserializable into a request object
+        appropriate for this method.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def serialize_response(self, response):
+    """Serialize the given response object.
+
+    Args:
+      response: A response object appropriate for this method.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def deserialize_response(self, serialized_response):
+    """Synthesize a response object from a given bytestring.
+
+    Args:
+      serialized_response: A bytestring deserializable into a response object
+        appropriate for this method.
+    """
+    raise NotImplementedError()
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/serial.py b/src/python/grpcio_test/grpc_test/framework/face/testing/serial.py
new file mode 100644
index 0000000000..47fc5822de
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/serial.py
@@ -0,0 +1,70 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Utility for serialization in the context of test RPC services."""
+
+import collections
+
+
+class Serialization(
+    collections.namedtuple(
+        '_Serialization',
+        ['request_serializers',
+         'request_deserializers',
+         'response_serializers',
+         'response_deserializers'])):
+  """An aggregation of serialization behaviors for an RPC service.
+
+  Attributes:
+    request_serializers: A dict from method name to request object serializer
+      behavior.
+    request_deserializers: A dict from method name to request object
+      deserializer behavior.
+    response_serializers: A dict from method name to response object serializer
+      behavior.
+    response_deserializers: A dict from method name to response object
+      deserializer behavior.
+  """
+
+
+def serialization(methods):
+  """Creates a Serialization from a sequences of interfaces.Method objects."""
+  request_serializers = {}
+  request_deserializers = {}
+  response_serializers = {}
+  response_deserializers = {}
+  for method in methods:
+    name = method.name()
+    request_serializers[name] = method.serialize_request
+    request_deserializers[name] = method.deserialize_request
+    response_serializers[name] = method.serialize_response
+    response_deserializers[name] = method.deserialize_response
+  return Serialization(
+      request_serializers, request_deserializers, response_serializers,
+      response_deserializers)
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/service.py b/src/python/grpcio_test/grpc_test/framework/face/testing/service.py
new file mode 100644
index 0000000000..ee9d6a3da3
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/service.py
@@ -0,0 +1,337 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Private interfaces implemented by data sets used in Face-layer tests."""
+
+import abc
+
+# interfaces is referenced from specification in this module.
+from grpc.framework.face import interfaces as face_interfaces  # pylint: disable=unused-import
+from grpc_test.framework.face.testing import interfaces
+
+
+class UnaryUnaryTestMethodImplementation(interfaces.Method):
+  """A controllable implementation of a unary-unary RPC method."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def service(self, request, response_callback, context, control):
+    """Services an RPC that accepts one message and produces one message.
+
+    Args:
+      request: The single request message for the RPC.
+      response_callback: A callback to be called to accept the response message
+        of the RPC.
+      context: An face_interfaces.RpcContext object.
+      control: A test_control.Control to control execution of this method.
+
+    Raises:
+      abandonment.Abandoned: May or may not be raised when the RPC has been
+        aborted.
+    """
+    raise NotImplementedError()
+
+
+class UnaryUnaryTestMessages(object):
+  """A type for unary-request-unary-response message pairings."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def request(self):
+    """Affords a request message.
+
+    Implementations of this method should return a different message with each
+    call so that multiple test executions of the test method may be made with
+    different inputs.
+
+    Returns:
+      A request message.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def verify(self, request, response, test_case):
+    """Verifies that the computed response matches the given request.
+
+    Args:
+      request: A request message.
+      response: A response message.
+      test_case: A unittest.TestCase object affording useful assertion methods.
+
+    Raises:
+      AssertionError: If the request and response do not match, indicating that
+        there was some problem executing the RPC under test.
+    """
+    raise NotImplementedError()
+
+
+class UnaryStreamTestMethodImplementation(interfaces.Method):
+  """A controllable implementation of a unary-stream RPC method."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def service(self, request, response_consumer, context, control):
+    """Services an RPC that takes one message and produces a stream of messages.
+
+    Args:
+      request: The single request message for the RPC.
+      response_consumer: A stream.Consumer to be called to accept the response
+        messages of the RPC.
+      context: A face_interfaces.RpcContext object.
+      control: A test_control.Control to control execution of this method.
+
+    Raises:
+      abandonment.Abandoned: May or may not be raised when the RPC has been
+        aborted.
+    """
+    raise NotImplementedError()
+
+
+class UnaryStreamTestMessages(object):
+  """A type for unary-request-stream-response message pairings."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def request(self):
+    """Affords a request message.
+
+    Implementations of this method should return a different message with each
+    call so that multiple test executions of the test method may be made with
+    different inputs.
+
+    Returns:
+      A request message.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def verify(self, request, responses, test_case):
+    """Verifies that the computed responses match the given request.
+
+    Args:
+      request: A request message.
+      responses: A sequence of response messages.
+      test_case: A unittest.TestCase object affording useful assertion methods.
+
+    Raises:
+      AssertionError: If the request and responses do not match, indicating that
+        there was some problem executing the RPC under test.
+    """
+    raise NotImplementedError()
+
+
+class StreamUnaryTestMethodImplementation(interfaces.Method):
+  """A controllable implementation of a stream-unary RPC method."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def service(self, response_callback, context, control):
+    """Services an RPC that takes a stream of messages and produces one message.
+
+    Args:
+      response_callback: A callback to be called to accept the response message
+        of the RPC.
+      context: A face_interfaces.RpcContext object.
+      control: A test_control.Control to control execution of this method.
+
+    Returns:
+      A stream.Consumer with which to accept the request messages of the RPC.
+        The consumer returned from this method may or may not be invoked to
+        completion: in the case of RPC abortion, RPC Framework will simply stop
+        passing messages to this object. Implementations must not assume that
+        this object will be called to completion of the request stream or even
+        called at all.
+
+    Raises:
+      abandonment.Abandoned: May or may not be raised when the RPC has been
+        aborted.
+    """
+    raise NotImplementedError()
+
+
+class StreamUnaryTestMessages(object):
+  """A type for stream-request-unary-response message pairings."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def requests(self):
+    """Affords a sequence of request messages.
+
+    Implementations of this method should return a different sequences with each
+    call so that multiple test executions of the test method may be made with
+    different inputs.
+
+    Returns:
+      A sequence of request messages.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def verify(self, requests, response, test_case):
+    """Verifies that the computed response matches the given requests.
+
+    Args:
+      requests: A sequence of request messages.
+      response: A response message.
+      test_case: A unittest.TestCase object affording useful assertion methods.
+
+    Raises:
+      AssertionError: If the requests and response do not match, indicating that
+        there was some problem executing the RPC under test.
+    """
+    raise NotImplementedError()
+
+
+class StreamStreamTestMethodImplementation(interfaces.Method):
+  """A controllable implementation of a stream-stream RPC method."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def service(self, response_consumer, context, control):
+    """Services an RPC that accepts and produces streams of messages.
+
+    Args:
+      response_consumer: A stream.Consumer to be called to accept the response
+        messages of the RPC.
+      context: A face_interfaces.RpcContext object.
+      control: A test_control.Control to control execution of this method.
+
+    Returns:
+      A stream.Consumer with which to accept the request messages of the RPC.
+        The consumer returned from this method may or may not be invoked to
+        completion: in the case of RPC abortion, RPC Framework will simply stop
+        passing messages to this object. Implementations must not assume that
+        this object will be called to completion of the request stream or even
+        called at all.
+
+    Raises:
+      abandonment.Abandoned: May or may not be raised when the RPC has been
+        aborted.
+    """
+    raise NotImplementedError()
+
+
+class StreamStreamTestMessages(object):
+  """A type for stream-request-stream-response message pairings."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def requests(self):
+    """Affords a sequence of request messages.
+
+    Implementations of this method should return a different sequences with each
+    call so that multiple test executions of the test method may be made with
+    different inputs.
+
+    Returns:
+      A sequence of request messages.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def verify(self, requests, responses, test_case):
+    """Verifies that the computed response matches the given requests.
+
+    Args:
+      requests: A sequence of request messages.
+      responses: A sequence of response messages.
+      test_case: A unittest.TestCase object affording useful assertion methods.
+
+    Raises:
+      AssertionError: If the requests and responses do not match, indicating
+        that there was some problem executing the RPC under test.
+    """
+    raise NotImplementedError()
+
+
+class TestService(object):
+  """A specification of implemented RPC methods to use in tests."""
+
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def name(self):
+    """Identifies the RPC service name used during the test.
+
+    Returns:
+      The RPC service name to be used for the test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def unary_unary_scenarios(self):
+    """Affords unary-request-unary-response test methods and their messages.
+
+    Returns:
+      A dict from method name to pair. The first element of the pair
+        is a UnaryUnaryTestMethodImplementation object and the second element
+        is a sequence of UnaryUnaryTestMethodMessages objects.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def unary_stream_scenarios(self):
+    """Affords unary-request-stream-response test methods and their messages.
+
+    Returns:
+      A dict from method name to pair. The first element of the pair is a
+        UnaryStreamTestMethodImplementation object and the second element is a
+        sequence of UnaryStreamTestMethodMessages objects.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def stream_unary_scenarios(self):
+    """Affords stream-request-unary-response test methods and their messages.
+
+    Returns:
+      A dict from method name to pair. The first element of the pair is a
+        StreamUnaryTestMethodImplementation object and the second element is a
+        sequence of StreamUnaryTestMethodMessages objects.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def stream_stream_scenarios(self):
+    """Affords stream-request-stream-response test methods and their messages.
+
+    Returns:
+      A dict from method name to pair. The first element of the pair is a
+        StreamStreamTestMethodImplementation object and the second element is a
+        sequence of StreamStreamTestMethodMessages objects.
+    """
+    raise NotImplementedError()
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/stock_service.py b/src/python/grpcio_test/grpc_test/framework/face/testing/stock_service.py
new file mode 100644
index 0000000000..0f83ca4db1
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/stock_service.py
@@ -0,0 +1,374 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Examples of Python implementations of the stock.proto Stock service."""
+
+from grpc.framework.common import cardinality
+from grpc.framework.foundation import abandonment
+from grpc.framework.foundation import stream
+from grpc.framework.foundation import stream_util
+from grpc_test.framework.face.testing import service
+from grpc_test._junkdrawer import stock_pb2
+
+SYMBOL_FORMAT = 'test symbol:%03d'
+STREAM_LENGTH = 400
+
+# A test-appropriate security-pricing function. :-P
+_price = lambda symbol_name: float(hash(symbol_name) % 4096)
+
+
+def _get_last_trade_price(stock_request, stock_reply_callback, control, active):
+  """A unary-request, unary-response test method."""
+  control.control()
+  if active():
+    stock_reply_callback(
+        stock_pb2.StockReply(
+            symbol=stock_request.symbol, price=_price(stock_request.symbol)))
+  else:
+    raise abandonment.Abandoned()
+
+
+def _get_last_trade_price_multiple(stock_reply_consumer, control, active):
+  """A stream-request, stream-response test method."""
+  def stock_reply_for_stock_request(stock_request):
+    control.control()
+    if active():
+      return stock_pb2.StockReply(
+          symbol=stock_request.symbol, price=_price(stock_request.symbol))
+    else:
+      raise abandonment.Abandoned()
+  return stream_util.TransformingConsumer(
+      stock_reply_for_stock_request, stock_reply_consumer)
+
+
+def _watch_future_trades(stock_request, stock_reply_consumer, control, active):
+  """A unary-request, stream-response test method."""
+  base_price = _price(stock_request.symbol)
+  for index in range(stock_request.num_trades_to_watch):
+    control.control()
+    if active():
+      stock_reply_consumer.consume(
+          stock_pb2.StockReply(
+              symbol=stock_request.symbol, price=base_price + index))
+    else:
+      raise abandonment.Abandoned()
+  stock_reply_consumer.terminate()
+
+
+def _get_highest_trade_price(stock_reply_callback, control, active):
+  """A stream-request, unary-response test method."""
+
+  class StockRequestConsumer(stream.Consumer):
+    """Keeps an ongoing record of the most valuable symbol yet consumed."""
+
+    def __init__(self):
+      self._symbol = None
+      self._price = None
+
+    def consume(self, stock_request):
+      control.control()
+      if active():
+        if self._price is None:
+          self._symbol = stock_request.symbol
+          self._price = _price(stock_request.symbol)
+        else:
+          candidate_price = _price(stock_request.symbol)
+          if self._price < candidate_price:
+            self._symbol = stock_request.symbol
+            self._price = candidate_price
+
+    def terminate(self):
+      control.control()
+      if active():
+        if self._symbol is None:
+          raise ValueError()
+        else:
+          stock_reply_callback(
+              stock_pb2.StockReply(symbol=self._symbol, price=self._price))
+          self._symbol = None
+          self._price = None
+
+    def consume_and_terminate(self, stock_request):
+      control.control()
+      if active():
+        if self._price is None:
+          stock_reply_callback(
+              stock_pb2.StockReply(
+                  symbol=stock_request.symbol,
+                  price=_price(stock_request.symbol)))
+        else:
+          candidate_price = _price(stock_request.symbol)
+          if self._price < candidate_price:
+            stock_reply_callback(
+                stock_pb2.StockReply(
+                    symbol=stock_request.symbol, price=candidate_price))
+          else:
+            stock_reply_callback(
+                stock_pb2.StockReply(
+                    symbol=self._symbol, price=self._price))
+
+        self._symbol = None
+        self._price = None
+
+  return StockRequestConsumer()
+
+
+class GetLastTradePrice(service.UnaryUnaryTestMethodImplementation):
+  """GetLastTradePrice for use in tests."""
+
+  def name(self):
+    return 'GetLastTradePrice'
+
+  def cardinality(self):
+    return cardinality.Cardinality.UNARY_UNARY
+
+  def request_class(self):
+    return stock_pb2.StockRequest
+
+  def response_class(self):
+    return stock_pb2.StockReply
+
+  def serialize_request(self, request):
+    return request.SerializeToString()
+
+  def deserialize_request(self, serialized_request):
+    return stock_pb2.StockRequest.FromString(serialized_request)
+
+  def serialize_response(self, response):
+    return response.SerializeToString()
+
+  def deserialize_response(self, serialized_response):
+    return stock_pb2.StockReply.FromString(serialized_response)
+
+  def service(self, request, response_callback, context, control):
+    _get_last_trade_price(
+        request, response_callback, control, context.is_active)
+
+
+class GetLastTradePriceMessages(service.UnaryUnaryTestMessages):
+
+  def __init__(self):
+    self._index = 0
+
+  def request(self):
+    symbol = SYMBOL_FORMAT % self._index
+    self._index += 1
+    return stock_pb2.StockRequest(symbol=symbol)
+
+  def verify(self, request, response, test_case):
+    test_case.assertEqual(request.symbol, response.symbol)
+    test_case.assertEqual(_price(request.symbol), response.price)
+
+
+class GetLastTradePriceMultiple(service.StreamStreamTestMethodImplementation):
+  """GetLastTradePriceMultiple for use in tests."""
+
+  def name(self):
+    return 'GetLastTradePriceMultiple'
+
+  def cardinality(self):
+    return cardinality.Cardinality.STREAM_STREAM
+
+  def request_class(self):
+    return stock_pb2.StockRequest
+
+  def response_class(self):
+    return stock_pb2.StockReply
+
+  def serialize_request(self, request):
+    return request.SerializeToString()
+
+  def deserialize_request(self, serialized_request):
+    return stock_pb2.StockRequest.FromString(serialized_request)
+
+  def serialize_response(self, response):
+    return response.SerializeToString()
+
+  def deserialize_response(self, serialized_response):
+    return stock_pb2.StockReply.FromString(serialized_response)
+
+  def service(self, response_consumer, context, control):
+    return _get_last_trade_price_multiple(
+        response_consumer, control, context.is_active)
+
+
+class GetLastTradePriceMultipleMessages(service.StreamStreamTestMessages):
+  """Pairs of message streams for use with GetLastTradePriceMultiple."""
+
+  def __init__(self):
+    self._index = 0
+
+  def requests(self):
+    base_index = self._index
+    self._index += 1
+    return [
+        stock_pb2.StockRequest(symbol=SYMBOL_FORMAT % (base_index + index))
+        for index in range(STREAM_LENGTH)]
+
+  def verify(self, requests, responses, test_case):
+    test_case.assertEqual(len(requests), len(responses))
+    for stock_request, stock_reply in zip(requests, responses):
+      test_case.assertEqual(stock_request.symbol, stock_reply.symbol)
+      test_case.assertEqual(_price(stock_request.symbol), stock_reply.price)
+
+
+class WatchFutureTrades(service.UnaryStreamTestMethodImplementation):
+  """WatchFutureTrades for use in tests."""
+
+  def name(self):
+    return 'WatchFutureTrades'
+
+  def cardinality(self):
+    return cardinality.Cardinality.UNARY_STREAM
+
+  def request_class(self):
+    return stock_pb2.StockRequest
+
+  def response_class(self):
+    return stock_pb2.StockReply
+
+  def serialize_request(self, request):
+    return request.SerializeToString()
+
+  def deserialize_request(self, serialized_request):
+    return stock_pb2.StockRequest.FromString(serialized_request)
+
+  def serialize_response(self, response):
+    return response.SerializeToString()
+
+  def deserialize_response(self, serialized_response):
+    return stock_pb2.StockReply.FromString(serialized_response)
+
+  def service(self, request, response_consumer, context, control):
+    _watch_future_trades(request, response_consumer, control, context.is_active)
+
+
+class WatchFutureTradesMessages(service.UnaryStreamTestMessages):
+  """Pairs of a single request message and a sequence of response messages."""
+
+  def __init__(self):
+    self._index = 0
+
+  def request(self):
+    symbol = SYMBOL_FORMAT % self._index
+    self._index += 1
+    return stock_pb2.StockRequest(
+        symbol=symbol, num_trades_to_watch=STREAM_LENGTH)
+
+  def verify(self, request, responses, test_case):
+    test_case.assertEqual(STREAM_LENGTH, len(responses))
+    base_price = _price(request.symbol)
+    for index, response in enumerate(responses):
+      test_case.assertEqual(base_price + index, response.price)
+
+
+class GetHighestTradePrice(service.StreamUnaryTestMethodImplementation):
+  """GetHighestTradePrice for use in tests."""
+
+  def name(self):
+    return 'GetHighestTradePrice'
+
+  def cardinality(self):
+    return cardinality.Cardinality.STREAM_UNARY
+
+  def request_class(self):
+    return stock_pb2.StockRequest
+
+  def response_class(self):
+    return stock_pb2.StockReply
+
+  def serialize_request(self, request):
+    return request.SerializeToString()
+
+  def deserialize_request(self, serialized_request):
+    return stock_pb2.StockRequest.FromString(serialized_request)
+
+  def serialize_response(self, response):
+    return response.SerializeToString()
+
+  def deserialize_response(self, serialized_response):
+    return stock_pb2.StockReply.FromString(serialized_response)
+
+  def service(self, response_callback, context, control):
+    return _get_highest_trade_price(
+        response_callback, control, context.is_active)
+
+
+class GetHighestTradePriceMessages(service.StreamUnaryTestMessages):
+
+  def requests(self):
+    return [
+        stock_pb2.StockRequest(symbol=SYMBOL_FORMAT % index)
+        for index in range(STREAM_LENGTH)]
+
+  def verify(self, requests, response, test_case):
+    price = None
+    symbol = None
+    for stock_request in requests:
+      current_symbol = stock_request.symbol
+      current_price = _price(current_symbol)
+      if price is None or price < current_price:
+        price = current_price
+        symbol = current_symbol
+    test_case.assertEqual(price, response.price)
+    test_case.assertEqual(symbol, response.symbol)
+
+
+class StockTestService(service.TestService):
+  """A corpus of test data with one method of each RPC cardinality."""
+
+  def name(self):
+    return 'Stock'
+
+  def unary_unary_scenarios(self):
+    return {
+        'GetLastTradePrice': (
+            GetLastTradePrice(), [GetLastTradePriceMessages()]),
+    }
+
+  def unary_stream_scenarios(self):
+    return {
+        'WatchFutureTrades': (
+            WatchFutureTrades(), [WatchFutureTradesMessages()]),
+    }
+
+  def stream_unary_scenarios(self):
+    return {
+        'GetHighestTradePrice': (
+            GetHighestTradePrice(), [GetHighestTradePriceMessages()])
+    }
+
+  def stream_stream_scenarios(self):
+    return {
+        'GetLastTradePriceMultiple': (
+            GetLastTradePriceMultiple(), [GetLastTradePriceMultipleMessages()]),
+    }
+
+
+STOCK_TEST_SERVICE = StockTestService()
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/test_case.py
new file mode 100644
index 0000000000..858d5cf7fd
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/test_case.py
@@ -0,0 +1,80 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Tools for creating tests of implementations of the Face layer."""
+
+import abc
+
+# face_interfaces and interfaces are referenced in specification in this module.
+from grpc.framework.face import interfaces as face_interfaces  # pylint: disable=unused-import
+from grpc_test.framework.face.testing import interfaces  # pylint: disable=unused-import
+
+
+class FaceTestCase(object):
+  """Describes a test of the Face Layer of RPC Framework.
+
+  Concrete subclasses must also inherit from unittest.TestCase and from at least
+  one class that defines test methods.
+  """
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def set_up_implementation(
+      self, name, methods, method_implementations,
+      multi_method_implementation):
+    """Instantiates the Face Layer implementation under test.
+
+    Args:
+      name: The service name to be used in the test.
+      methods: A sequence of interfaces.Method objects describing the RPC
+        methods that will be called during the test.
+      method_implementations: A dictionary from string RPC method name to
+        face_interfaces.MethodImplementation object specifying
+        implementation of an RPC method.
+      multi_method_implementation: An face_interfaces.MultiMethodImplementation
+        or None.
+
+    Returns:
+      A sequence of length two the first element of which is a
+        face_interfaces.GenericStub (backed by the given method
+        implementations), and the second element of which is an arbitrary memo
+        object to be kept and passed to tearDownImplementation at the conclusion
+        of the test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def tear_down_implementation(self, memo):
+    """Destroys the Face layer implementation under test.
+
+    Args:
+      memo: The object from the second position of the return value of
+        set_up_implementation.
+    """
+    raise NotImplementedError()
diff --git a/src/python/grpcio_test/grpc_test/framework/foundation/__init__.py b/src/python/grpcio_test/grpc_test/framework/foundation/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/foundation/_later_test.py b/src/python/grpcio_test/grpc_test/framework/foundation/_later_test.py
new file mode 100644
index 0000000000..6c2459e185
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/_later_test.py
@@ -0,0 +1,151 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Tests of the later module."""
+
+import threading
+import time
+import unittest
+
+from grpc.framework.foundation import later
+
+TICK = 0.1
+
+
+class LaterTest(unittest.TestCase):
+
+  def test_simple_delay(self):
+    lock = threading.Lock()
+    cell = [0]
+    return_value = object()
+
+    def computation():
+      with lock:
+        cell[0] += 1
+      return return_value
+    computation_future = later.later(TICK * 2, computation)
+
+    self.assertFalse(computation_future.done())
+    self.assertFalse(computation_future.cancelled())
+    time.sleep(TICK)
+    self.assertFalse(computation_future.done())
+    self.assertFalse(computation_future.cancelled())
+    with lock:
+      self.assertEqual(0, cell[0])
+    time.sleep(TICK * 2)
+    self.assertTrue(computation_future.done())
+    self.assertFalse(computation_future.cancelled())
+    with lock:
+      self.assertEqual(1, cell[0])
+    self.assertEqual(return_value, computation_future.result())
+
+  def test_callback(self):
+    lock = threading.Lock()
+    cell = [0]
+    callback_called = [False]
+    future_passed_to_callback = [None]
+    def computation():
+      with lock:
+        cell[0] += 1
+    computation_future = later.later(TICK * 2, computation)
+    def callback(outcome):
+      with lock:
+        callback_called[0] = True
+        future_passed_to_callback[0] = outcome
+    computation_future.add_done_callback(callback)
+    time.sleep(TICK)
+    with lock:
+      self.assertFalse(callback_called[0])
+    time.sleep(TICK * 2)
+    with lock:
+      self.assertTrue(callback_called[0])
+      self.assertTrue(future_passed_to_callback[0].done())
+
+      callback_called[0] = False
+      future_passed_to_callback[0] = None
+
+    computation_future.add_done_callback(callback)
+    with lock:
+      self.assertTrue(callback_called[0])
+      self.assertTrue(future_passed_to_callback[0].done())
+
+  def test_cancel(self):
+    lock = threading.Lock()
+    cell = [0]
+    callback_called = [False]
+    future_passed_to_callback = [None]
+    def computation():
+      with lock:
+        cell[0] += 1
+    computation_future = later.later(TICK * 2, computation)
+    def callback(outcome):
+      with lock:
+        callback_called[0] = True
+        future_passed_to_callback[0] = outcome
+    computation_future.add_done_callback(callback)
+    time.sleep(TICK)
+    with lock:
+      self.assertFalse(callback_called[0])
+    computation_future.cancel()
+    self.assertTrue(computation_future.cancelled())
+    self.assertFalse(computation_future.running())
+    self.assertTrue(computation_future.done())
+    with lock:
+      self.assertTrue(callback_called[0])
+      self.assertTrue(future_passed_to_callback[0].cancelled())
+
+  def test_result(self):
+    lock = threading.Lock()
+    cell = [0]
+    callback_called = [False]
+    future_passed_to_callback_cell = [None]
+    return_value = object()
+
+    def computation():
+      with lock:
+        cell[0] += 1
+      return return_value
+    computation_future = later.later(TICK * 2, computation)
+
+    def callback(future_passed_to_callback):
+      with lock:
+        callback_called[0] = True
+        future_passed_to_callback_cell[0] = future_passed_to_callback
+    computation_future.add_done_callback(callback)
+    returned_value = computation_future.result()
+    self.assertEqual(return_value, returned_value)
+
+    # The callback may not yet have been called! Sleep a tick.
+    time.sleep(TICK)
+    with lock:
+      self.assertTrue(callback_called[0])
+      self.assertEqual(return_value, future_passed_to_callback_cell[0].result())
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)
diff --git a/src/python/grpcio_test/grpc_test/framework/foundation/_logging_pool_test.py b/src/python/grpcio_test/grpc_test/framework/foundation/_logging_pool_test.py
new file mode 100644
index 0000000000..452802da6a
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/_logging_pool_test.py
@@ -0,0 +1,64 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Tests for grpc.framework.foundation.logging_pool."""
+
+import unittest
+
+from grpc.framework.foundation import logging_pool
+
+_POOL_SIZE = 16
+
+
+class LoggingPoolTest(unittest.TestCase):
+
+  def testUpAndDown(self):
+    pool = logging_pool.pool(_POOL_SIZE)
+    pool.shutdown(wait=True)
+
+    with logging_pool.pool(_POOL_SIZE) as pool:
+      self.assertIsNotNone(pool)
+
+  def testTaskExecuted(self):
+    test_list = []
+
+    with logging_pool.pool(_POOL_SIZE) as pool:
+      pool.submit(lambda: test_list.append(object())).result()
+
+    self.assertTrue(test_list)
+
+  def testException(self):
+    with logging_pool.pool(_POOL_SIZE) as pool:
+      raised_exception = pool.submit(lambda: 1/0).exception()
+
+    self.assertIsNotNone(raised_exception)
+
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)
diff --git a/src/python/grpcio_test/grpc_test/framework/foundation/stream_testing.py b/src/python/grpcio_test/grpc_test/framework/foundation/stream_testing.py
new file mode 100644
index 0000000000..098a53d5e7
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/stream_testing.py
@@ -0,0 +1,73 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Utilities for testing stream-related code."""
+
+from grpc.framework.foundation import stream
+
+
+class TestConsumer(stream.Consumer):
+  """A stream.Consumer instrumented for testing.
+
+  Attributes:
+    calls: A sequence of value-termination pairs describing the history of calls
+      made on this object.
+  """
+
+  def __init__(self):
+    self.calls = []
+
+  def consume(self, value):
+    """See stream.Consumer.consume for specification."""
+    self.calls.append((value, False))
+
+  def terminate(self):
+    """See stream.Consumer.terminate for specification."""
+    self.calls.append((None, True))
+
+  def consume_and_terminate(self, value):
+    """See stream.Consumer.consume_and_terminate for specification."""
+    self.calls.append((value, True))
+
+  def is_legal(self):
+    """Reports whether or not a legal sequence of calls has been made."""
+    terminated = False
+    for value, terminal in self.calls:
+      if terminated:
+        return False
+      elif terminal:
+        terminated = True
+      elif value is None:
+        return False
+    else:  # pylint: disable=useless-else-on-loop
+      return True
+
+  def values(self):
+    """Returns the sequence of values that have been passed to this Consumer."""
+    return [value for value, _ in self.calls if value]
diff --git a/src/python/grpcio_test/grpc_test/framework/interfaces/__init__.py b/src/python/grpcio_test/grpc_test/framework/interfaces/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/interfaces/links/__init__.py b/src/python/grpcio_test/grpc_test/framework/interfaces/links/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/links/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_cases.py b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_cases.py
new file mode 100644
index 0000000000..26ca035c44
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_cases.py
@@ -0,0 +1,333 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Tests of the links interface of RPC Framework."""
+
+# unittest is referenced from specification in this module.
+import abc
+import unittest  # pylint: disable=unused-import
+
+from grpc.framework.interfaces.links import links
+from grpc_test.framework.common import test_constants
+from grpc_test.framework.interfaces.links import test_utilities
+
+
+def at_least_n_payloads_received_predicate(n):
+  def predicate(ticket_sequence):
+    payload_count = 0
+    for ticket in ticket_sequence:
+      if ticket.payload is not None:
+        payload_count += 1
+        if n <= payload_count:
+          return True
+    else:
+      return False
+  return predicate
+
+
+def terminated(ticket_sequence):
+  return ticket_sequence and ticket_sequence[-1].termination is not None
+
+_TRANSMISSION_GROUP = 'test.Group'
+_TRANSMISSION_METHOD = 'TestMethod'
+
+
+class TransmissionTest(object):
+  """Tests ticket transmission between two connected links.
+
+  This class must be mixed into a unittest.TestCase that implements the abstract
+  methods it provides.
+  """
+  __metaclass__ = abc.ABCMeta
+
+  # This is a unittest.TestCase mix-in.
+  # pylint: disable=invalid-name
+
+  @abc.abstractmethod
+  def create_transmitting_links(self):
+    """Creates two connected links for use in this test.
+
+    Returns:
+      Two links.Links, the first of which will be used on the invocation side
+        of RPCs and the second of which will be used on the service side of
+        RPCs.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def destroy_transmitting_links(self, invocation_side_link, service_side_link):
+    """Destroys the two connected links created for this test.
+
+
+    Args:
+      invocation_side_link: The link used on the invocation side of RPCs in
+        this test.
+      service_side_link: The link used on the service side of RPCs in this
+        test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def create_invocation_initial_metadata(self):
+    """Creates a value for use as invocation-side initial metadata.
+
+    Returns:
+      A metadata value appropriate for use as invocation-side initial metadata
+        or None if invocation-side initial metadata transmission is not
+        supported by the links under test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def create_invocation_terminal_metadata(self):
+    """Creates a value for use as invocation-side terminal metadata.
+
+    Returns:
+      A metadata value appropriate for use as invocation-side terminal
+        metadata or None if invocation-side terminal metadata transmission is
+        not supported by the links under test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def create_service_initial_metadata(self):
+    """Creates a value for use as service-side initial metadata.
+
+    Returns:
+      A metadata value appropriate for use as service-side initial metadata or
+        None if service-side initial metadata transmission is not supported by
+        the links under test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def create_service_terminal_metadata(self):
+    """Creates a value for use as service-side terminal metadata.
+
+    Returns:
+      A metadata value appropriate for use as service-side terminal metadata or
+        None if service-side terminal metadata transmission is not supported by
+        the links under test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def create_invocation_completion(self):
+    """Creates values for use as invocation-side code and message.
+
+    Returns:
+      An invocation-side code value and an invocation-side message value.
+        Either or both may be None if invocation-side code and/or
+        invocation-side message transmission is not supported by the links
+        under test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def create_service_completion(self):
+    """Creates values for use as service-side code and message.
+
+    Returns:
+      A service-side code value and a service-side message value. Either or
+        both may be None if service-side code and/or service-side message
+        transmission is not supported by the links under test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def assertMetadataTransmitted(self, original_metadata, transmitted_metadata):
+    """Asserts that transmitted_metadata contains original_metadata.
+
+    Args:
+      original_metadata: A metadata object used in this test.
+      transmitted_metadata: A metadata object obtained after transmission
+        through the system under test.
+
+    Raises:
+      AssertionError: if the transmitted_metadata object does not contain
+        original_metadata.
+    """
+    raise NotImplementedError()
+
+  def group_and_method(self):
+    """Returns the group and method used in this test case.
+
+    Returns:
+      A pair of the group and method used in this test case.
+    """
+    return _TRANSMISSION_GROUP, _TRANSMISSION_METHOD
+
+  def serialize_request(self, request):
+    """Serializes a request value used in this test case.
+
+    Args:
+      request: A request value created by this test case.
+
+    Returns:
+      A bytestring that is the serialization of the given request.
+    """
+    return request
+
+  def deserialize_request(self, serialized_request):
+    """Deserializes a request value used in this test case.
+
+    Args:
+      serialized_request: A bytestring that is the serialization of some request
+        used in this test case.
+
+    Returns:
+      The request value encoded by the given bytestring.
+    """
+    return serialized_request
+
+  def serialize_response(self, response):
+    """Serializes a response value used in this test case.
+
+    Args:
+      response: A response value created by this test case.
+
+    Returns:
+      A bytestring that is the serialization of the given response.
+    """
+    return response
+
+  def deserialize_response(self, serialized_response):
+    """Deserializes a response value used in this test case.
+
+    Args:
+      serialized_response: A bytestring that is the serialization of some
+        response used in this test case.
+
+    Returns:
+      The response value encoded by the given bytestring.
+    """
+    return serialized_response
+
+  def _assert_is_valid_metadata_payload_sequence(
+      self, ticket_sequence, payloads, initial_metadata, terminal_metadata):
+    initial_metadata_seen = False
+    seen_payloads = []
+    terminal_metadata_seen = False
+
+    for ticket in ticket_sequence:
+      if ticket.initial_metadata is not None:
+        self.assertFalse(initial_metadata_seen)
+        self.assertFalse(seen_payloads)
+        self.assertFalse(terminal_metadata_seen)
+        self.assertMetadataTransmitted(initial_metadata, ticket.initial_metadata)
+        initial_metadata_seen = True
+
+      if ticket.payload is not None:
+        self.assertFalse(terminal_metadata_seen)
+        seen_payloads.append(ticket.payload)
+
+      if ticket.terminal_metadata is not None:
+        self.assertFalse(terminal_metadata_seen)
+        self.assertMetadataTransmitted(terminal_metadata, ticket.terminal_metadata)
+        terminal_metadata_seen = True
+    self.assertSequenceEqual(payloads, seen_payloads)
+
+  def _assert_is_valid_invocation_sequence(
+      self, ticket_sequence, group, method, payloads, initial_metadata,
+      terminal_metadata, termination):
+    self.assertLess(0, len(ticket_sequence))
+    self.assertEqual(group, ticket_sequence[0].group)
+    self.assertEqual(method, ticket_sequence[0].method)
+    self._assert_is_valid_metadata_payload_sequence(
+        ticket_sequence, payloads, initial_metadata, terminal_metadata)
+    self.assertIs(termination, ticket_sequence[-1].termination)
+
+  def _assert_is_valid_service_sequence(
+      self, ticket_sequence, payloads, initial_metadata, terminal_metadata,
+      code, message, termination):
+    self.assertLess(0, len(ticket_sequence))
+    self._assert_is_valid_metadata_payload_sequence(
+        ticket_sequence, payloads, initial_metadata, terminal_metadata)
+    self.assertEqual(code, ticket_sequence[-1].code)
+    self.assertEqual(message, ticket_sequence[-1].message)
+    self.assertIs(termination, ticket_sequence[-1].termination)
+
+  def setUp(self):
+    self._invocation_link, self._service_link = self.create_transmitting_links()
+    self._invocation_mate = test_utilities.RecordingLink()
+    self._service_mate = test_utilities.RecordingLink()
+    self._invocation_link.join_link(self._invocation_mate)
+    self._service_link.join_link(self._service_mate)
+
+  def tearDown(self):
+    self.destroy_transmitting_links(self._invocation_link, self._service_link)
+
+  def testSimplestRoundTrip(self):
+    """Tests transmission of one ticket in each direction."""
+    invocation_operation_id = object()
+    invocation_payload = b'\x07' * 1023
+    timeout = test_constants.LONG_TIMEOUT
+    invocation_initial_metadata = self.create_invocation_initial_metadata()
+    invocation_terminal_metadata = self.create_invocation_terminal_metadata()
+    invocation_code, invocation_message = self.create_invocation_completion()
+    service_payload = b'\x08' * 1025
+    service_initial_metadata = self.create_service_initial_metadata()
+    service_terminal_metadata = self.create_service_terminal_metadata()
+    service_code, service_message = self.create_service_completion()
+
+    original_invocation_ticket = links.Ticket(
+        invocation_operation_id, 0, _TRANSMISSION_GROUP, _TRANSMISSION_METHOD,
+        links.Ticket.Subscription.FULL, timeout, 0, invocation_initial_metadata,
+        invocation_payload, invocation_terminal_metadata, invocation_code,
+        invocation_message, links.Ticket.Termination.COMPLETION)
+    self._invocation_link.accept_ticket(original_invocation_ticket)
+
+    # TODO(nathaniel): This shouldn't be necessary. Detecting the end of the
+    # invocation-side ticket sequence shouldn't require granting allowance for
+    # another payload.
+    self._service_mate.block_until_tickets_satisfy(
+        at_least_n_payloads_received_predicate(1))
+    service_operation_id = self._service_mate.tickets()[0].operation_id
+    self._service_link.accept_ticket(
+        links.Ticket(
+            service_operation_id, 0, None, None, links.Ticket.Subscription.FULL,
+            None, 1, None, None, None, None, None, None))
+
+    self._service_mate.block_until_tickets_satisfy(terminated)
+    self._assert_is_valid_invocation_sequence(
+        self._service_mate.tickets(), _TRANSMISSION_GROUP, _TRANSMISSION_METHOD,
+        (invocation_payload,), invocation_initial_metadata,
+        invocation_terminal_metadata, links.Ticket.Termination.COMPLETION)
+
+    original_service_ticket = links.Ticket(
+        service_operation_id, 1, None, None, links.Ticket.Subscription.FULL,
+        timeout, 0, service_initial_metadata, service_payload,
+        service_terminal_metadata, service_code, service_message,
+        links.Ticket.Termination.COMPLETION)
+    self._service_link.accept_ticket(original_service_ticket)
+    self._invocation_mate.block_until_tickets_satisfy(terminated)
+    self._assert_is_valid_service_sequence(
+        self._invocation_mate.tickets(), (service_payload,),
+        service_initial_metadata, service_terminal_metadata, service_code,
+        service_message, links.Ticket.Termination.COMPLETION)
diff --git a/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_utilities.py b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_utilities.py
new file mode 100644
index 0000000000..6c2e3346aa
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_utilities.py
@@ -0,0 +1,66 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""State and behavior appropriate for use in tests."""
+
+import threading
+
+from grpc.framework.interfaces.links import links
+
+
+class RecordingLink(links.Link):
+  """A Link that records every ticket passed to it."""
+
+  def __init__(self):
+    self._condition = threading.Condition()
+    self._tickets = []
+
+  def accept_ticket(self, ticket):
+    with self._condition:
+      self._tickets.append(ticket)
+      self._condition.notify_all()
+
+  def join_link(self, link):
+    pass
+
+  def block_until_tickets_satisfy(self, predicate):
+    """Blocks until the received tickets satisfy the given predicate.
+
+    Args:
+      predicate: A callable that takes a sequence of tickets and returns a
+        boolean value.
+    """
+    with self._condition:
+      while not predicate(self._tickets):
+        self._condition.wait()
+
+  def tickets(self):
+    """Returns a copy of the list of all tickets received by this Link."""
+    with self._condition:
+      return tuple(self._tickets)