Merge pull request #11583 from nathanielmanistaatgoogle/grpc_testing

gRPC Python test infrastructure.

12 files changed, 1385 insertions, 0 deletions

diff --git a/src/python/grpcio_testing/grpc_testing/__init__.py b/src/python/grpcio_testing/grpc_testing/__init__.py
index 14e25f09e2..917e11808e 100644
--- a/src/python/grpcio_testing/grpc_testing/__init__.py
+++ b/src/python/grpcio_testing/grpc_testing/__init__.py
@@ -293,6 +293,278 @@ class Channel(six.with_metaclass(abc.ABCMeta), grpc.Channel):
         raise NotImplementedError()
 
 
+class UnaryUnaryServerRpc(six.with_metaclass(abc.ABCMeta)):
+    """Fixture for a unary-unary RPC serviced by a system under test.
+
+    Enables users to "play client" for the RPC.
+    """
+
+    @abc.abstractmethod
+    def initial_metadata(self):
+        """Accesses the initial metadata emitted by the system under test.
+
+        This method blocks until the system under test has added initial
+        metadata to the RPC (or has provided one or more response messages or
+        has terminated the RPC, either of which will cause gRPC Python to
+        synthesize initial metadata for the RPC).
+
+        Returns:
+          The initial metadata for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancels the RPC."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def termination(self):
+        """Blocks until the system under test has terminated the RPC.
+
+        Returns:
+          A (response, trailing_metadata, code, details) sequence with the RPC's
+            response, trailing metadata, code, and details.
+        """
+        raise NotImplementedError()
+
+
+class UnaryStreamServerRpc(six.with_metaclass(abc.ABCMeta)):
+    """Fixture for a unary-stream RPC serviced by a system under test.
+
+    Enables users to "play client" for the RPC.
+    """
+
+    @abc.abstractmethod
+    def initial_metadata(self):
+        """Accesses the initial metadata emitted by the system under test.
+
+        This method blocks until the system under test has added initial
+        metadata to the RPC (or has provided one or more response messages or
+        has terminated the RPC, either of which will cause gRPC Python to
+        synthesize initial metadata for the RPC).
+
+        Returns:
+          The initial metadata for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def take_response(self):
+        """Draws one of the responses added to the RPC by the system under test.
+
+        Successive calls to this method return responses in the same order in
+        which the system under test added them to the RPC.
+
+        Returns:
+          A response message added to the RPC by the system under test.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancels the RPC."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def termination(self):
+        """Blocks until the system under test has terminated the RPC.
+
+        Returns:
+          A (trailing_metadata, code, details) sequence with the RPC's trailing
+            metadata, code, and details.
+        """
+        raise NotImplementedError()
+
+
+class StreamUnaryServerRpc(six.with_metaclass(abc.ABCMeta)):
+    """Fixture for a stream-unary RPC serviced by a system under test.
+
+    Enables users to "play client" for the RPC.
+    """
+
+    @abc.abstractmethod
+    def initial_metadata(self):
+        """Accesses the initial metadata emitted by the system under test.
+
+        This method blocks until the system under test has added initial
+        metadata to the RPC (or has provided one or more response messages or
+        has terminated the RPC, either of which will cause gRPC Python to
+        synthesize initial metadata for the RPC).
+
+        Returns:
+          The initial metadata for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def send_request(self, request):
+        """Sends a request to the system under test.
+
+        Args:
+          request: A request message for the RPC to be "sent" to the system
+            under test.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def requests_closed(self):
+        """Indicates the end of the RPC's request stream."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancels the RPC."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def termination(self):
+        """Blocks until the system under test has terminated the RPC.
+
+        Returns:
+          A (response, trailing_metadata, code, details) sequence with the RPC's
+            response, trailing metadata, code, and details.
+        """
+        raise NotImplementedError()
+
+
+class StreamStreamServerRpc(six.with_metaclass(abc.ABCMeta)):
+    """Fixture for a stream-stream RPC serviced by a system under test.
+
+    Enables users to "play client" for the RPC.
+    """
+
+    @abc.abstractmethod
+    def initial_metadata(self):
+        """Accesses the initial metadata emitted by the system under test.
+
+        This method blocks until the system under test has added initial
+        metadata to the RPC (or has provided one or more response messages or
+        has terminated the RPC, either of which will cause gRPC Python to
+        synthesize initial metadata for the RPC).
+
+        Returns:
+          The initial metadata for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def send_request(self, request):
+        """Sends a request to the system under test.
+
+        Args:
+          request: A request message for the RPC to be "sent" to the system
+            under test.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def requests_closed(self):
+        """Indicates the end of the RPC's request stream."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def take_response(self):
+        """Draws one of the responses added to the RPC by the system under test.
+
+        Successive calls to this method return responses in the same order in
+        which the system under test added them to the RPC.
+
+        Returns:
+          A response message added to the RPC by the system under test.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        """Cancels the RPC."""
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def termination(self):
+        """Blocks until the system under test has terminated the RPC.
+
+        Returns:
+          A (trailing_metadata, code, details) sequence with the RPC's trailing
+            metadata, code, and details.
+        """
+        raise NotImplementedError()
+
+
+class Server(six.with_metaclass(abc.ABCMeta)):
+    """A server with which to test a system that services RPCs."""
+
+    @abc.abstractmethod
+    def invoke_unary_unary(
+            self, method_descriptor, invocation_metadata, request, timeout):
+        """Invokes an RPC to be serviced by the system under test.
+
+        Args:
+          method_descriptor: A descriptor.MethodDescriptor describing a unary-unary
+            RPC method.
+          invocation_metadata: The RPC's invocation metadata.
+          request: The RPC's request.
+          timeout: A duration of time in seconds for the RPC or None to
+            indicate that the RPC has no time limit.
+
+        Returns:
+          A UnaryUnaryServerRpc with which to "play client" for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def invoke_unary_stream(
+            self, method_descriptor, invocation_metadata, request, timeout):
+        """Invokes an RPC to be serviced by the system under test.
+
+        Args:
+          method_descriptor: A descriptor.MethodDescriptor describing a unary-stream
+            RPC method.
+          invocation_metadata: The RPC's invocation metadata.
+          request: The RPC's request.
+          timeout: A duration of time in seconds for the RPC or None to
+            indicate that the RPC has no time limit.
+
+        Returns:
+          A UnaryStreamServerRpc with which to "play client" for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def invoke_stream_unary(
+            self, method_descriptor, invocation_metadata, timeout):
+        """Invokes an RPC to be serviced by the system under test.
+
+        Args:
+          method_descriptor: A descriptor.MethodDescriptor describing a stream-unary
+            RPC method.
+          invocation_metadata: The RPC's invocation metadata.
+          timeout: A duration of time in seconds for the RPC or None to
+            indicate that the RPC has no time limit.
+
+        Returns:
+          A StreamUnaryServerRpc with which to "play client" for the RPC.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def invoke_stream_stream(
+            self, method_descriptor, invocation_metadata, timeout):
+        """Invokes an RPC to be serviced by the system under test.
+
+        Args:
+          method_descriptor: A descriptor.MethodDescriptor describing a stream-stream
+            RPC method.
+          invocation_metadata: The RPC's invocation metadata.
+          timeout: A duration of time in seconds for the RPC or None to
+            indicate that the RPC has no time limit.
+
+        Returns:
+          A StreamStreamServerRpc with which to "play client" for the RPC.
+        """
+        raise NotImplementedError()
+
+
 class Time(six.with_metaclass(abc.ABCMeta)):
     """A simulation of time.
 
@@ -406,3 +678,20 @@ def channel(service_descriptors, time):
     """
     from grpc_testing import _channel
     return _channel.testing_channel(service_descriptors, time)
+
+
+def server_from_dictionary(descriptors_to_servicers, time):
+    """Creates a Server for use in tests of a gRPC Python-using system.
+
+    Args:
+      descriptors_to_servicers: A dictionary from descriptor.ServiceDescriptors
+        defining RPC services to servicer objects (usually instances of classes
+        that implement "Servicer" interfaces defined in generated "_pb2_grpc"
+        modules) implementing those services.
+      time: A Time to be used for tests.
+
+    Returns:
+      A Server for use in tests.
+    """
+    from grpc_testing import _server
+    return _server.server_from_dictionary(descriptors_to_servicers, time)
diff --git a/src/python/grpcio_testing/grpc_testing/_common.py b/src/python/grpcio_testing/grpc_testing/_common.py
index cb4a7f5fa2..1517434ca7 100644
--- a/src/python/grpcio_testing/grpc_testing/_common.py
+++ b/src/python/grpcio_testing/grpc_testing/_common.py
@@ -37,6 +37,16 @@ def fuss_with_metadata(metadata):
         return _fuss(tuple(metadata))
 
 
+def rpc_names(service_descriptors):
+    rpc_names_to_descriptors = {}
+    for service_descriptor in service_descriptors:
+        for method_descriptor in service_descriptor.methods_by_name.values():
+            rpc_name = '/{}/{}'.format(
+                service_descriptor.full_name, method_descriptor.name)
+            rpc_names_to_descriptors[rpc_name] = method_descriptor
+    return rpc_names_to_descriptors
+
+
 class ChannelRpcRead(
         collections.namedtuple(
             'ChannelRpcRead',
@@ -90,3 +100,61 @@ class ChannelHandler(six.with_metaclass(abc.ABCMeta)):
             self, method_full_rpc_name, invocation_metadata, requests,
             requests_closed, timeout):
         raise NotImplementedError()
+
+
+class ServerRpcRead(
+        collections.namedtuple('ServerRpcRead',
+                               ('request', 'requests_closed', 'terminated',))):
+    pass
+
+
+REQUESTS_CLOSED = ServerRpcRead(None, True, False)
+TERMINATED = ServerRpcRead(None, False, True)
+
+
+class ServerRpcHandler(six.with_metaclass(abc.ABCMeta)):
+
+    @abc.abstractmethod
+    def send_initial_metadata(self, initial_metadata):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def take_request(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_response(self, response):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def send_termination(self, trailing_metadata, code, details):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_termination_callback(self, callback):
+        raise NotImplementedError()
+
+
+class Serverish(six.with_metaclass(abc.ABCMeta)):
+
+    @abc.abstractmethod
+    def invoke_unary_unary(
+            self, method_descriptor, handler, invocation_metadata, request,
+            deadline):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def invoke_unary_stream(
+            self, method_descriptor, handler, invocation_metadata, request,
+            deadline):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def invoke_stream_unary(
+            self, method_descriptor, handler, invocation_metadata, deadline):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def invoke_stream_stream(
+            self, method_descriptor, handler, invocation_metadata, deadline):
+        raise NotImplementedError()
diff --git a/src/python/grpcio_testing/grpc_testing/_server/__init__.py b/src/python/grpcio_testing/grpc_testing/_server/__init__.py
new file mode 100644
index 0000000000..759512949a
--- /dev/null
+++ b/src/python/grpcio_testing/grpc_testing/_server/__init__.py
@@ -0,0 +1,20 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from grpc_testing._server import _server
+
+
+def server_from_dictionary(descriptors_to_servicers, time):
+    return _server.server_from_descriptor_to_servicers(
+        descriptors_to_servicers, time)
diff --git a/src/python/grpcio_testing/grpc_testing/_server/_handler.py b/src/python/grpcio_testing/grpc_testing/_server/_handler.py
new file mode 100644
index 0000000000..b47e04c718
--- /dev/null
+++ b/src/python/grpcio_testing/grpc_testing/_server/_handler.py
@@ -0,0 +1,215 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import abc
+import threading
+
+import grpc
+from grpc_testing import _common
+
+_CLIENT_INACTIVE = object()
+
+
+class Handler(_common.ServerRpcHandler):
+
+    @abc.abstractmethod
+    def initial_metadata(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_request(self, request):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def take_response(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def requests_closed(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancel(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def unary_response_termination(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def stream_response_termination(self):
+        raise NotImplementedError()
+
+
+class _Handler(Handler):
+
+    def __init__(self, requests_closed):
+        self._condition = threading.Condition()
+        self._requests = []
+        self._requests_closed = requests_closed
+        self._initial_metadata = None
+        self._responses = []
+        self._trailing_metadata = None
+        self._code = None
+        self._details = None
+        self._unary_response = None
+        self._expiration_future = None
+        self._termination_callbacks = []
+
+    def send_initial_metadata(self, initial_metadata):
+        with self._condition:
+            self._initial_metadata = initial_metadata
+            self._condition.notify_all()
+
+    def take_request(self):
+        with self._condition:
+            while True:
+                if self._code is None:
+                    if self._requests:
+                        request = self._requests.pop(0)
+                        self._condition.notify_all()
+                        return _common.ServerRpcRead(request, False, False)
+                    elif self._requests_closed:
+                        return _common.REQUESTS_CLOSED
+                    else:
+                        self._condition.wait()
+                else:
+                    return _common.TERMINATED
+
+    def is_active(self):
+        with self._condition:
+            return self._code is None
+
+    def add_response(self, response):
+        with self._condition:
+            self._responses.append(response)
+            self._condition.notify_all()
+
+    def send_termination(self, trailing_metadata, code, details):
+        with self._condition:
+            self._trailing_metadata = trailing_metadata
+            self._code = code
+            self._details = details
+            if self._expiration_future is not None:
+                self._expiration_future.cancel()
+            self._condition.notify_all()
+
+    def add_termination_callback(self, termination_callback):
+        with self._condition:
+            if self._code is None:
+                self._termination_callbacks.append(termination_callback)
+                return True
+            else:
+                return False
+
+    def initial_metadata(self):
+        with self._condition:
+            while True:
+                if self._initial_metadata is None:
+                    if self._code is None:
+                        self._condition.wait()
+                    else:
+                        raise ValueError(
+                            'No initial metadata despite status code!')
+                else:
+                    return self._initial_metadata
+
+    def add_request(self, request):
+        with self._condition:
+            self._requests.append(request)
+            self._condition.notify_all()
+
+    def take_response(self):
+        with self._condition:
+            while True:
+                if self._responses:
+                    response = self._responses.pop(0)
+                    self._condition.notify_all()
+                    return response
+                elif self._code is None:
+                    self._condition.wait()
+                else:
+                    raise ValueError('No more responses!')
+
+    def requests_closed(self):
+        with self._condition:
+            self._requests_closed = True
+            self._condition.notify_all()
+
+    def cancel(self):
+        with self._condition:
+            if self._code is None:
+                self._code = _CLIENT_INACTIVE
+                termination_callbacks = self._termination_callbacks
+                self._termination_callbacks = None
+                if self._expiration_future is not None:
+                    self._expiration_future.cancel()
+                self._condition.notify_all()
+        for termination_callback in termination_callbacks:
+            termination_callback()
+
+    def unary_response_termination(self):
+        with self._condition:
+            while True:
+                if self._code is _CLIENT_INACTIVE:
+                    raise ValueError('Huh? Cancelled but wanting status?')
+                elif self._code is None:
+                    self._condition.wait()
+                else:
+                    if self._unary_response is None:
+                        if self._responses:
+                            self._unary_response = self._responses.pop(0)
+                    return (
+                        self._unary_response, self._trailing_metadata,
+                        self._code, self._details,)
+
+
+    def stream_response_termination(self):
+        with self._condition:
+            while True:
+                if self._code is _CLIENT_INACTIVE:
+                    raise ValueError('Huh? Cancelled but wanting status?')
+                elif self._code is None:
+                    self._condition.wait()
+                else:
+                    return self._trailing_metadata, self._code, self._details,
+
+    def expire(self):
+        with self._condition:
+            if self._code is None:
+                if self._initial_metadata is None:
+                    self._initial_metadata = _common.FUSSED_EMPTY_METADATA
+                self._trailing_metadata = _common.FUSSED_EMPTY_METADATA
+                self._code = grpc.StatusCode.DEADLINE_EXCEEDED
+                self._details = 'Took too much time!'
+                termination_callbacks = self._termination_callbacks
+                self._termination_callbacks = None
+                self._condition.notify_all()
+        for termination_callback in termination_callbacks:
+            termination_callback()
+
+    def set_expiration_future(self, expiration_future):
+        with self._condition:
+            self._expiration_future = expiration_future
+
+
+def handler_without_deadline(requests_closed):
+    return _Handler(requests_closed)
+
+
+def handler_with_deadline(requests_closed, time, deadline):
+    handler = _Handler(requests_closed)
+    expiration_future = time.call_at(handler.expire, deadline)
+    handler.set_expiration_future(expiration_future)
+    return handler
diff --git a/src/python/grpcio_testing/grpc_testing/_server/_rpc.py b/src/python/grpcio_testing/grpc_testing/_server/_rpc.py
new file mode 100644
index 0000000000..f81876f4b2
--- /dev/null
+++ b/src/python/grpcio_testing/grpc_testing/_server/_rpc.py
@@ -0,0 +1,153 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+import threading
+
+import grpc
+from grpc_testing import _common
+
+
+class Rpc(object):
+
+    def __init__(self, handler, invocation_metadata):
+        self._condition = threading.Condition()
+        self._handler = handler
+        self._invocation_metadata = invocation_metadata
+        self._initial_metadata_sent = False
+        self._pending_trailing_metadata = None
+        self._pending_code = None
+        self._pending_details = None
+        self._callbacks = []
+        self._active = True
+        self._rpc_errors = []
+
+    def _ensure_initial_metadata_sent(self):
+        if not self._initial_metadata_sent:
+            self._handler.send_initial_metadata(_common.FUSSED_EMPTY_METADATA)
+            self._initial_metadata_sent = True
+
+    def _call_back(self):
+        callbacks = tuple(self._callbacks)
+        self._callbacks = None
+
+        def call_back():
+            for callback in callbacks:
+                try:
+                    callback()
+                except Exception:  # pylint: disable=broad-except
+                    logging.exception('Exception calling server-side callback!')
+
+        callback_calling_thread = threading.Thread(target=call_back)
+        callback_calling_thread.start()
+
+    def _terminate(self, trailing_metadata, code, details):
+        if self._active:
+            self._active = False
+            self._handler.send_termination(trailing_metadata, code, details)
+            self._call_back()
+            self._condition.notify_all()
+
+    def _complete(self):
+        if self._pending_trailing_metadata is None:
+            trailing_metadata = _common.FUSSED_EMPTY_METADATA
+        else:
+            trailing_metadata = self._pending_trailing_metadata
+        if self._pending_code is None:
+            code = grpc.StatusCode.OK
+        else:
+            code = self._pending_code
+        details = '' if self._pending_details is None else self._pending_details
+        self._terminate(trailing_metadata, code, details)
+
+    def _abort(self, code, details):
+        self._terminate(_common.FUSSED_EMPTY_METADATA, code, details)
+
+    def add_rpc_error(self, rpc_error):
+        with self._condition:
+            self._rpc_errors.append(rpc_error)
+
+    def application_cancel(self):
+        with self._condition:
+            self._abort(
+                grpc.StatusCode.CANCELLED,
+                'Cancelled by server-side application!')
+
+    def application_exception_abort(self, exception):
+        with self._condition:
+            if exception not in self._rpc_errors:
+                logging.exception('Exception calling application!')
+                self._abort(
+                    grpc.StatusCode.UNKNOWN,
+                    'Exception calling application: {}'.format(exception))
+
+    def extrinsic_abort(self):
+        with self._condition:
+            if self._active:
+                self._active = False
+                self._call_back()
+                self._condition.notify_all()
+
+    def unary_response_complete(self, response):
+        with self._condition:
+            self._ensure_initial_metadata_sent()
+            self._handler.add_response(response)
+            self._complete()
+
+    def stream_response(self, response):
+        with self._condition:
+            self._ensure_initial_metadata_sent()
+            self._handler.add_response(response)
+
+    def stream_response_complete(self):
+        with self._condition:
+            self._ensure_initial_metadata_sent()
+            self._complete()
+
+    def send_initial_metadata(self, initial_metadata):
+        with self._condition:
+            if self._initial_metadata_sent:
+                return False
+            else:
+                self._handler.send_initial_metadata(initial_metadata)
+                self._initial_metadata_sent = True
+                return True
+
+    def is_active(self):
+        with self._condition:
+            return self._active
+
+    def add_callback(self, callback):
+        with self._condition:
+            if self._callbacks is None:
+                return False
+            else:
+                self._callbacks.append(callback)
+                return True
+
+    def invocation_metadata(self):
+        with self._condition:
+            return self._invocation_metadata
+
+    def set_trailing_metadata(self, trailing_metadata):
+        with self._condition:
+            self._pending_trailing_metadata = trailing_metadata
+
+    def set_code(self, code):
+        with self._condition:
+            self._pending_code = code
+
+    def set_details(self, details):
+        with self._condition:
+            self._pending_details = details
diff --git a/src/python/grpcio_testing/grpc_testing/_server/_server.py b/src/python/grpcio_testing/grpc_testing/_server/_server.py
new file mode 100644
index 0000000000..66bcfc13c0
--- /dev/null
+++ b/src/python/grpcio_testing/grpc_testing/_server/_server.py
@@ -0,0 +1,149 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import threading
+
+import grpc_testing
+from grpc_testing import _common
+from grpc_testing._server import _handler
+from grpc_testing._server import _rpc
+from grpc_testing._server import _server_rpc
+from grpc_testing._server import _service
+from grpc_testing._server import _servicer_context
+
+
+def _implementation(descriptors_to_servicers, method_descriptor):
+    servicer = descriptors_to_servicers[method_descriptor.containing_service]
+    return getattr(servicer, method_descriptor.name)
+
+
+def _unary_unary_service(request):
+    def service(implementation, rpc, servicer_context):
+        _service.unary_unary(
+            implementation, rpc, request, servicer_context)
+    return service
+
+
+def _unary_stream_service(request):
+    def service(implementation, rpc, servicer_context):
+        _service.unary_stream(
+            implementation, rpc, request, servicer_context)
+    return service
+
+
+def _stream_unary_service(handler):
+    def service(implementation, rpc, servicer_context):
+        _service.stream_unary(implementation, rpc, handler, servicer_context)
+    return service
+
+
+def _stream_stream_service(handler):
+    def service(implementation, rpc, servicer_context):
+        _service.stream_stream(implementation, rpc, handler, servicer_context)
+    return service
+
+
+class _Serverish(_common.Serverish):
+
+    def __init__(self, descriptors_to_servicers, time):
+        self._descriptors_to_servicers = descriptors_to_servicers
+        self._time = time
+
+    def _invoke(
+            self, service_behavior, method_descriptor, handler,
+            invocation_metadata, deadline):
+        implementation = _implementation(
+            self._descriptors_to_servicers, method_descriptor)
+        rpc = _rpc.Rpc(handler, invocation_metadata)
+        if handler.add_termination_callback(rpc.extrinsic_abort):
+            servicer_context = _servicer_context.ServicerContext(
+                rpc, self._time, deadline)
+            service_thread = threading.Thread(
+                target=service_behavior,
+                args=(implementation, rpc, servicer_context,))
+            service_thread.start()
+
+    def invoke_unary_unary(
+            self, method_descriptor, handler, invocation_metadata, request,
+            deadline):
+        self._invoke(
+            _unary_unary_service(request), method_descriptor, handler,
+            invocation_metadata, deadline)
+
+    def invoke_unary_stream(
+            self, method_descriptor, handler, invocation_metadata, request,
+            deadline):
+        self._invoke(
+            _unary_stream_service(request), method_descriptor, handler,
+            invocation_metadata, deadline)
+
+    def invoke_stream_unary(
+            self, method_descriptor, handler, invocation_metadata, deadline):
+        self._invoke(
+            _stream_unary_service(handler), method_descriptor, handler,
+            invocation_metadata, deadline)
+
+    def invoke_stream_stream(
+            self, method_descriptor, handler, invocation_metadata, deadline):
+        self._invoke(
+            _stream_stream_service(handler), method_descriptor, handler,
+            invocation_metadata, deadline)
+
+
+def _deadline_and_handler(requests_closed, time, timeout):
+    if timeout is None:
+        return None, _handler.handler_without_deadline(requests_closed)
+    else:
+        deadline = time.time() + timeout
+        handler = _handler.handler_with_deadline(requests_closed, time, deadline)
+        return deadline, handler
+
+
+class _Server(grpc_testing.Server):
+
+    def __init__(self, serverish, time):
+        self._serverish = serverish
+        self._time = time
+
+    def invoke_unary_unary(
+            self, method_descriptor, invocation_metadata, request, timeout):
+        deadline, handler = _deadline_and_handler(True, self._time, timeout)
+        self._serverish.invoke_unary_unary(
+            method_descriptor, handler, invocation_metadata, request, deadline)
+        return _server_rpc.UnaryUnaryServerRpc(handler)
+
+    def invoke_unary_stream(
+            self, method_descriptor, invocation_metadata, request, timeout):
+        deadline, handler = _deadline_and_handler(True, self._time, timeout)
+        self._serverish.invoke_unary_stream(
+            method_descriptor, handler, invocation_metadata, request, deadline)
+        return _server_rpc.UnaryStreamServerRpc(handler)
+
+    def invoke_stream_unary(
+            self, method_descriptor, invocation_metadata, timeout):
+        deadline, handler = _deadline_and_handler(False, self._time, timeout)
+        self._serverish.invoke_stream_unary(
+            method_descriptor, handler, invocation_metadata, deadline)
+        return _server_rpc.StreamUnaryServerRpc(handler)
+
+    def invoke_stream_stream(
+            self, method_descriptor, invocation_metadata, timeout):
+        deadline, handler = _deadline_and_handler(False, self._time, timeout)
+        self._serverish.invoke_stream_stream(
+            method_descriptor, handler, invocation_metadata, deadline)
+        return _server_rpc.StreamStreamServerRpc(handler)
+
+
+def server_from_descriptor_to_servicers(descriptors_to_servicers, time):
+    return _Server(_Serverish(descriptors_to_servicers, time), time)
diff --git a/src/python/grpcio_testing/grpc_testing/_server/_server_rpc.py b/src/python/grpcio_testing/grpc_testing/_server/_server_rpc.py
new file mode 100644
index 0000000000..30de8ff0e2
--- /dev/null
+++ b/src/python/grpcio_testing/grpc_testing/_server/_server_rpc.py
@@ -0,0 +1,93 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import grpc_testing
+
+
+class UnaryUnaryServerRpc(grpc_testing.UnaryUnaryServerRpc):
+
+    def __init__(self, handler):
+        self._handler = handler
+
+    def initial_metadata(self):
+        return self._handler.initial_metadata()
+
+    def cancel(self):
+        self._handler.cancel()
+
+    def termination(self):
+        return self._handler.unary_response_termination()
+
+
+class UnaryStreamServerRpc(grpc_testing.UnaryStreamServerRpc):
+
+    def __init__(self, handler):
+        self._handler = handler
+
+    def initial_metadata(self):
+        return self._handler.initial_metadata()
+
+    def take_response(self):
+        return self._handler.take_response()
+
+    def cancel(self):
+        self._handler.cancel()
+
+    def termination(self):
+        return self._handler.stream_response_termination()
+
+
+class StreamUnaryServerRpc(grpc_testing.StreamUnaryServerRpc):
+
+    def __init__(self, handler):
+        self._handler = handler
+
+    def initial_metadata(self):
+        return self._handler.initial_metadata()
+
+    def send_request(self, request):
+        self._handler.add_request(request)
+
+    def requests_closed(self):
+        self._handler.requests_closed()
+
+    def cancel(self):
+        self._handler.cancel()
+
+    def termination(self):
+        return self._handler.unary_response_termination()
+
+
+class StreamStreamServerRpc(grpc_testing.StreamStreamServerRpc):
+
+    def __init__(self, handler):
+        self._handler = handler
+
+    def initial_metadata(self):
+        return self._handler.initial_metadata()
+
+    def send_request(self, request):
+        self._handler.add_request(request)
+
+    def requests_closed(self):
+        self._handler.requests_closed()
+
+    def take_response(self):
+        return self._handler.take_response()
+
+    def cancel(self):
+        self._handler.cancel()
+
+    def termination(self):
+        return self._handler.stream_response_termination()
diff --git a/src/python/grpcio_testing/grpc_testing/_server/_service.py b/src/python/grpcio_testing/grpc_testing/_server/_service.py
new file mode 100644
index 0000000000..36b0a2f7ff
--- /dev/null
+++ b/src/python/grpcio_testing/grpc_testing/_server/_service.py
@@ -0,0 +1,88 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import grpc
+
+
+class _RequestIterator(object):
+
+    def __init__(self, rpc, handler):
+        self._rpc = rpc
+        self._handler = handler
+
+    def _next(self):
+        read = self._handler.take_request()
+        if read.requests_closed:
+            raise StopIteration()
+        elif read.terminated:
+            rpc_error = grpc.RpcError()
+            self._rpc.add_rpc_error(rpc_error)
+            raise rpc_error
+        else:
+            return read.request
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self._next()
+
+    def next(self):
+        return self._next()
+
+
+def _unary_response(argument, implementation, rpc, servicer_context):
+    try:
+        response = implementation(argument, servicer_context)
+    except Exception as exception:  # pylint: disable=broad-except
+        rpc.application_exception_abort(exception)
+    else:
+        rpc.unary_response_complete(response)
+
+
+def _stream_response(argument, implementation, rpc, servicer_context):
+    try:
+        response_iterator = implementation(argument, servicer_context)
+    except Exception as exception:  # pylint: disable=broad-except
+        rpc.application_exception_abort(exception)
+    else:
+        while True:
+            try:
+                response = next(response_iterator)
+            except StopIteration:
+                rpc.stream_response_complete()
+                break
+            except Exception as exception:  # pylint: disable=broad-except
+                rpc.application_exception_abort(exception)
+                break
+            else:
+                rpc.stream_response(response)
+
+
+def unary_unary(implementation, rpc, request, servicer_context):
+    _unary_response(request, implementation, rpc, servicer_context)
+
+
+def unary_stream(implementation, rpc, request, servicer_context):
+    _stream_response(request, implementation, rpc, servicer_context)
+
+
+def stream_unary(implementation, rpc, handler, servicer_context):
+    _unary_response(
+        _RequestIterator(rpc, handler), implementation, rpc, servicer_context)
+
+
+def stream_stream(implementation, rpc, handler, servicer_context):
+    _stream_response(
+        _RequestIterator(rpc, handler), implementation, rpc, servicer_context)
diff --git a/src/python/grpcio_testing/grpc_testing/_server/_servicer_context.py b/src/python/grpcio_testing/grpc_testing/_server/_servicer_context.py
new file mode 100644
index 0000000000..496689ded0
--- /dev/null
+++ b/src/python/grpcio_testing/grpc_testing/_server/_servicer_context.py
@@ -0,0 +1,74 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import grpc
+from grpc_testing import _common
+
+
+class ServicerContext(grpc.ServicerContext):
+
+    def __init__(self, rpc, time, deadline):
+        self._rpc = rpc
+        self._time = time
+        self._deadline = deadline
+
+    def is_active(self):
+        return self._rpc.is_active()
+
+    def time_remaining(self):
+        if self._rpc.is_active():
+            if self._deadline is None:
+                return None
+            else:
+                return max(0.0, self._deadline - self._time.time())
+        else:
+            return 0.0
+
+    def cancel(self):
+        self._rpc.application_cancel()
+
+    def add_callback(self, callback):
+        return self._rpc.add_callback(callback)
+
+    def invocation_metadata(self):
+        return self._rpc.invocation_metadata()
+
+    def peer(self):
+        raise NotImplementedError()
+
+    def peer_identities(self):
+        raise NotImplementedError()
+
+    def peer_identity_key(self):
+        raise NotImplementedError()
+
+    def auth_context(self):
+        raise NotImplementedError()
+
+    def send_initial_metadata(self, initial_metadata):
+        initial_metadata_sent = self._rpc.send_initial_metadata(
+            _common.fuss_with_metadata(initial_metadata))
+        if not initial_metadata_sent:
+            raise ValueError(
+                'ServicerContext.send_initial_metadata called too late!')
+
+    def set_trailing_metadata(self, trailing_metadata):
+        self._rpc.set_trailing_metadata(
+            _common.fuss_with_metadata(trailing_metadata))
+
+    def set_code(self, code):
+        self._rpc.set_code(code)
+
+    def set_details(self, details):
+        self._rpc.set_details(details)
diff --git a/src/python/grpcio_tests/tests/testing/_server_application.py b/src/python/grpcio_tests/tests/testing/_server_application.py
new file mode 100644
index 0000000000..06f09c8cb4
--- /dev/null
+++ b/src/python/grpcio_tests/tests/testing/_server_application.py
@@ -0,0 +1,66 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""An example gRPC Python-using server-side application."""
+
+import grpc
+
+# requests_pb2 is a semantic dependency of this module.
+from tests.testing import _application_common
+from tests.testing.proto import requests_pb2  # pylint: disable=unused-import
+from tests.testing.proto import services_pb2
+from tests.testing.proto import services_pb2_grpc
+
+
+class FirstServiceServicer(services_pb2_grpc.FirstServiceServicer):
+    """Services RPCs."""
+
+    def UnUn(self, request, context):
+        if _application_common.UNARY_UNARY_REQUEST == request:
+            return _application_common.UNARY_UNARY_RESPONSE
+        else:
+            context.set_code(grpc.StatusCode.INVALID_ARGUMENT)
+            context.set_details('Something is wrong with your request!')
+            return services_pb2.Down()
+
+    def UnStre(self, request, context):
+        if _application_common.UNARY_STREAM_REQUEST != request:
+            context.set_code(grpc.StatusCode.INVALID_ARGUMENT)
+            context.set_details('Something is wrong with your request!')
+        return
+        yield services_pb2.Strange()
+
+    def StreUn(self, request_iterator, context):
+        context.send_initial_metadata((
+            ('server_application_metadata_key', 'Hi there!',),))
+        for request in request_iterator:
+            if request != _application_common.STREAM_UNARY_REQUEST:
+                context.set_code(grpc.StatusCode.INVALID_ARGUMENT)
+                context.set_details('Something is wrong with your request!')
+                return services_pb2.Strange()
+            elif not context.is_active():
+                return services_pb2.Strange()
+        else:
+            return _application_common.STREAM_UNARY_RESPONSE
+
+    def StreStre(self, request_iterator, context):
+        for request in request_iterator:
+            if request != _application_common.STREAM_STREAM_REQUEST:
+                context.set_code(grpc.StatusCode.INVALID_ARGUMENT)
+                context.set_details('Something is wrong with your request!')
+                return
+            elif not context.is_active():
+                return
+            else:
+                yield _application_common.STREAM_STREAM_RESPONSE
+                yield _application_common.STREAM_STREAM_RESPONSE
diff --git a/src/python/grpcio_tests/tests/testing/_server_test.py b/src/python/grpcio_tests/tests/testing/_server_test.py
new file mode 100644
index 0000000000..7897bcce01
--- /dev/null
+++ b/src/python/grpcio_tests/tests/testing/_server_test.py
@@ -0,0 +1,169 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import time
+import unittest
+
+import grpc
+import grpc_testing
+
+from tests.testing import _application_common
+from tests.testing import _application_testing_common
+from tests.testing import _server_application
+from tests.testing.proto import services_pb2
+
+
+# TODO(https://github.com/google/protobuf/issues/3452): Drop this skip.
+@unittest.skipIf(
+    services_pb2.DESCRIPTOR.services_by_name.get('FirstService') is None,
+    'Fix protobuf issue 3452!')
+class FirstServiceServicerTest(unittest.TestCase):
+
+    def setUp(self):
+        self._real_time = grpc_testing.strict_real_time()
+        self._fake_time = grpc_testing.strict_fake_time(time.time())
+        servicer = _server_application.FirstServiceServicer()
+        descriptors_to_servicers = {
+            _application_testing_common.FIRST_SERVICE: servicer
+        }
+        self._real_time_server = grpc_testing.server_from_dictionary(
+            descriptors_to_servicers, self._real_time)
+        self._fake_time_server = grpc_testing.server_from_dictionary(
+            descriptors_to_servicers, self._fake_time)
+
+    def test_successful_unary_unary(self):
+        rpc = self._real_time_server.invoke_unary_unary(
+            _application_testing_common.FIRST_SERVICE_UNUN, (),
+            _application_common.UNARY_UNARY_REQUEST, None)
+        initial_metadata = rpc.initial_metadata()
+        response, trailing_metadata, code, details = rpc.termination()
+
+        self.assertEqual(_application_common.UNARY_UNARY_RESPONSE, response)
+        self.assertIs(code, grpc.StatusCode.OK)
+
+    def test_successful_unary_stream(self):
+        rpc = self._real_time_server.invoke_unary_stream(
+            _application_testing_common.FIRST_SERVICE_UNSTRE, (),
+            _application_common.UNARY_STREAM_REQUEST, None)
+        initial_metadata = rpc.initial_metadata()
+        trailing_metadata, code, details = rpc.termination()
+
+        self.assertIs(code, grpc.StatusCode.OK)
+
+    def test_successful_stream_unary(self):
+        rpc = self._real_time_server.invoke_stream_unary(
+            _application_testing_common.FIRST_SERVICE_STREUN, (), None)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        rpc.requests_closed()
+        initial_metadata = rpc.initial_metadata()
+        response, trailing_metadata, code, details = rpc.termination()
+
+        self.assertEqual(_application_common.STREAM_UNARY_RESPONSE, response)
+        self.assertIs(code, grpc.StatusCode.OK)
+
+    def test_successful_stream_stream(self):
+        rpc = self._real_time_server.invoke_stream_stream(
+            _application_testing_common.FIRST_SERVICE_STRESTRE, (), None)
+        rpc.send_request(_application_common.STREAM_STREAM_REQUEST)
+        initial_metadata = rpc.initial_metadata()
+        responses = [
+            rpc.take_response(),
+            rpc.take_response(),
+        ]
+        rpc.send_request(_application_common.STREAM_STREAM_REQUEST)
+        rpc.send_request(_application_common.STREAM_STREAM_REQUEST)
+        responses.extend([
+            rpc.take_response(),
+            rpc.take_response(),
+            rpc.take_response(),
+            rpc.take_response(),
+        ])
+        rpc.requests_closed()
+        trailing_metadata, code, details = rpc.termination()
+
+        for response in responses:
+            self.assertEqual(_application_common.STREAM_STREAM_RESPONSE,
+                             response)
+        self.assertIs(code, grpc.StatusCode.OK)
+
+    def test_server_rpc_idempotence(self):
+        rpc = self._real_time_server.invoke_unary_unary(
+            _application_testing_common.FIRST_SERVICE_UNUN, (),
+            _application_common.UNARY_UNARY_REQUEST, None)
+        first_initial_metadata = rpc.initial_metadata()
+        second_initial_metadata = rpc.initial_metadata()
+        third_initial_metadata = rpc.initial_metadata()
+        first_termination = rpc.termination()
+        second_termination = rpc.termination()
+        third_termination = rpc.termination()
+
+        for later_initial_metadata in (second_initial_metadata,
+                                       third_initial_metadata,):
+            self.assertEqual(first_initial_metadata, later_initial_metadata)
+        response = first_termination[0]
+        terminal_metadata = first_termination[1]
+        code = first_termination[2]
+        details = first_termination[3]
+        for later_termination in (second_termination, third_termination,):
+            self.assertEqual(response, later_termination[0])
+            self.assertEqual(terminal_metadata, later_termination[1])
+            self.assertIs(code, later_termination[2])
+            self.assertEqual(details, later_termination[3])
+        self.assertEqual(_application_common.UNARY_UNARY_RESPONSE, response)
+        self.assertIs(code, grpc.StatusCode.OK)
+
+    def test_misbehaving_client_unary_unary(self):
+        rpc = self._real_time_server.invoke_unary_unary(
+            _application_testing_common.FIRST_SERVICE_UNUN, (),
+            _application_common.ERRONEOUS_UNARY_UNARY_REQUEST, None)
+        initial_metadata = rpc.initial_metadata()
+        response, trailing_metadata, code, details = rpc.termination()
+
+        self.assertIsNot(code, grpc.StatusCode.OK)
+
+    def test_infinite_request_stream_real_time(self):
+        rpc = self._real_time_server.invoke_stream_unary(
+            _application_testing_common.FIRST_SERVICE_STREUN, (),
+            _application_common.INFINITE_REQUEST_STREAM_TIMEOUT)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        initial_metadata = rpc.initial_metadata()
+        self._real_time.sleep_for(
+            _application_common.INFINITE_REQUEST_STREAM_TIMEOUT * 2)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        response, trailing_metadata, code, details = rpc.termination()
+
+        self.assertIs(code, grpc.StatusCode.DEADLINE_EXCEEDED)
+
+    def test_infinite_request_stream_fake_time(self):
+        rpc = self._fake_time_server.invoke_stream_unary(
+            _application_testing_common.FIRST_SERVICE_STREUN, (),
+            _application_common.INFINITE_REQUEST_STREAM_TIMEOUT)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        initial_metadata = rpc.initial_metadata()
+        self._fake_time.sleep_for(
+            _application_common.INFINITE_REQUEST_STREAM_TIMEOUT * 2)
+        rpc.send_request(_application_common.STREAM_UNARY_REQUEST)
+        response, trailing_metadata, code, details = rpc.termination()
+
+        self.assertIs(code, grpc.StatusCode.DEADLINE_EXCEEDED)
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)
diff --git a/src/python/grpcio_tests/tests/tests.json b/src/python/grpcio_tests/tests/tests.json
index c10719b86f..d61297b918 100644
--- a/src/python/grpcio_tests/tests/tests.json
+++ b/src/python/grpcio_tests/tests/tests.json
@@ -10,6 +10,7 @@
   "protoc_plugin.beta_python_plugin_test.PythonPluginTest",
   "reflection._reflection_servicer_test.ReflectionServicerTest",
   "testing._client_test.ClientTest",
+  "testing._server_test.FirstServiceServicerTest",
   "testing._time_test.StrictFakeTimeTest",
   "testing._time_test.StrictRealTimeTest",
   "unit._api_test.AllTest",