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diff --git a/src/python/grpcio/tests/unit/_exit_scenarios.py b/src/python/grpcio/tests/unit/_exit_scenarios.py
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+# Copyright 2016, 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.
+
+"""Defines a number of module-scope gRPC scenarios to test clean exit."""
+
+import argparse
+import threading
+import time
+
+import grpc
+
+from tests.unit.framework.common import test_constants
+
+WAIT_TIME = 1000
+
+REQUEST = b'request'
+
+UNSTARTED_SERVER = 'unstarted_server'
+RUNNING_SERVER = 'running_server'
+POLL_CONNECTIVITY_NO_SERVER = 'poll_connectivity_no_server'
+POLL_CONNECTIVITY = 'poll_connectivity'
+IN_FLIGHT_UNARY_UNARY_CALL = 'in_flight_unary_unary_call'
+IN_FLIGHT_UNARY_STREAM_CALL = 'in_flight_unary_stream_call'
+IN_FLIGHT_STREAM_UNARY_CALL = 'in_flight_stream_unary_call'
+IN_FLIGHT_STREAM_STREAM_CALL = 'in_flight_stream_stream_call'
+IN_FLIGHT_PARTIAL_UNARY_STREAM_CALL = 'in_flight_partial_unary_stream_call'
+IN_FLIGHT_PARTIAL_STREAM_UNARY_CALL = 'in_flight_partial_stream_unary_call'
+IN_FLIGHT_PARTIAL_STREAM_STREAM_CALL = 'in_flight_partial_stream_stream_call'
+
+UNARY_UNARY = b'/test/UnaryUnary'
+UNARY_STREAM = b'/test/UnaryStream'
+STREAM_UNARY = b'/test/StreamUnary'
+STREAM_STREAM = b'/test/StreamStream'
+PARTIAL_UNARY_STREAM = b'/test/PartialUnaryStream'
+PARTIAL_STREAM_UNARY = b'/test/PartialStreamUnary'
+PARTIAL_STREAM_STREAM = b'/test/PartialStreamStream'
+
+TEST_TO_METHOD = {
+    IN_FLIGHT_UNARY_UNARY_CALL: UNARY_UNARY,
+    IN_FLIGHT_UNARY_STREAM_CALL: UNARY_STREAM,
+    IN_FLIGHT_STREAM_UNARY_CALL: STREAM_UNARY,
+    IN_FLIGHT_STREAM_STREAM_CALL: STREAM_STREAM,
+    IN_FLIGHT_PARTIAL_UNARY_STREAM_CALL: PARTIAL_UNARY_STREAM,
+    IN_FLIGHT_PARTIAL_STREAM_UNARY_CALL: PARTIAL_STREAM_UNARY,
+    IN_FLIGHT_PARTIAL_STREAM_STREAM_CALL: PARTIAL_STREAM_STREAM,
+}
+
+
+def hang_unary_unary(request, servicer_context):
+  time.sleep(WAIT_TIME)
+
+
+def hang_unary_stream(request, servicer_context):
+  time.sleep(WAIT_TIME)
+
+
+def hang_partial_unary_stream(request, servicer_context):
+  for _ in range(test_constants.STREAM_LENGTH // 2):
+    yield request
+  time.sleep(WAIT_TIME)
+
+
+def hang_stream_unary(request_iterator, servicer_context):
+  time.sleep(WAIT_TIME)
+
+
+def hang_partial_stream_unary(request_iterator, servicer_context):
+  for _ in range(test_constants.STREAM_LENGTH // 2):
+    next(request_iterator)
+  time.sleep(WAIT_TIME)
+
+
+def hang_stream_stream(request_iterator, servicer_context):
+  time.sleep(WAIT_TIME)
+
+
+def hang_partial_stream_stream(request_iterator, servicer_context):
+  for _ in range(test_constants.STREAM_LENGTH // 2):
+    yield next(request_iterator)
+  time.sleep(WAIT_TIME)
+
+
+class MethodHandler(grpc.RpcMethodHandler):
+
+  def __init__(self, request_streaming, response_streaming, partial_hang):
+    self.request_streaming = request_streaming
+    self.response_streaming = response_streaming
+    self.request_deserializer = None
+    self.response_serializer = None
+    self.unary_unary = None
+    self.unary_stream = None
+    self.stream_unary = None
+    self.stream_stream = None
+    if self.request_streaming and self.response_streaming:
+      if partial_hang:
+        self.stream_stream = hang_partial_stream_stream
+      else:
+        self.stream_stream = hang_stream_stream
+    elif self.request_streaming:
+      if partial_hang:
+        self.stream_unary = hang_partial_stream_unary
+      else:
+        self.stream_unary = hang_stream_unary
+    elif self.response_streaming:
+      if partial_hang:
+        self.unary_stream = hang_partial_unary_stream
+      else:
+        self.unary_stream = hang_unary_stream
+    else:
+      self.unary_unary = hang_unary_unary
+
+
+class GenericHandler(grpc.GenericRpcHandler):
+
+  def service(self, handler_call_details):
+    if handler_call_details.method == UNARY_UNARY:
+      return MethodHandler(False, False, False)
+    elif handler_call_details.method == UNARY_STREAM:
+      return MethodHandler(False, True, False)
+    elif handler_call_details.method == STREAM_UNARY:
+      return MethodHandler(True, False, False)
+    elif handler_call_details.method == STREAM_STREAM:
+      return MethodHandler(True, True, False)
+    elif handler_call_details.method == PARTIAL_UNARY_STREAM:
+      return MethodHandler(False, True, True)
+    elif handler_call_details.method == PARTIAL_STREAM_UNARY:
+      return MethodHandler(True, False, True)
+    elif handler_call_details.method == PARTIAL_STREAM_STREAM:
+      return MethodHandler(True, True, True)
+    else:
+      return None
+
+
+# Traditional executors will not exit until all their
+# current jobs complete.  Because we submit jobs that will
+# never finish, we don't want to block exit on these jobs.
+class DaemonPool(object):
+
+  def submit(self, fn, *args, **kwargs):
+    thread = threading.Thread(target=fn, args=args, kwargs=kwargs)
+    thread.daemon = True
+    thread.start()
+
+  def shutdown(self, wait=True):
+    pass
+
+
+def infinite_request_iterator():
+  while True:
+    yield REQUEST
+
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser()
+  parser.add_argument('scenario', type=str)
+  parser.add_argument(
+      '--wait_for_interrupt', dest='wait_for_interrupt', action='store_true')
+  args = parser.parse_args()
+
+  if args.scenario == UNSTARTED_SERVER:
+    server = grpc.server((), DaemonPool())
+    if args.wait_for_interrupt:
+      time.sleep(WAIT_TIME)
+  elif args.scenario == RUNNING_SERVER:
+    server = grpc.server((), DaemonPool())
+    port = server.add_insecure_port('[::]:0')
+    server.start()
+    if args.wait_for_interrupt:
+      time.sleep(WAIT_TIME)
+  elif args.scenario == POLL_CONNECTIVITY_NO_SERVER:
+    channel = grpc.insecure_channel('localhost:12345')
+
+    def connectivity_callback(connectivity):
+      pass
+
+    channel.subscribe(connectivity_callback, try_to_connect=True)
+    if args.wait_for_interrupt:
+      time.sleep(WAIT_TIME)
+  elif args.scenario == POLL_CONNECTIVITY:
+    server = grpc.server((), DaemonPool())
+    port = server.add_insecure_port('[::]:0')
+    server.start()
+    channel = grpc.insecure_channel('localhost:%d' % port)
+
+    def connectivity_callback(connectivity):
+      pass
+
+    channel.subscribe(connectivity_callback, try_to_connect=True)
+    if args.wait_for_interrupt:
+      time.sleep(WAIT_TIME)
+
+  else:
+    handler = GenericHandler()
+    server = grpc.server((), DaemonPool())
+    port = server.add_insecure_port('[::]:0')
+    server.add_generic_rpc_handlers((handler,))
+    server.start()
+    channel = grpc.insecure_channel('localhost:%d' % port)
+
+    method = TEST_TO_METHOD[args.scenario]
+
+    if args.scenario == IN_FLIGHT_UNARY_UNARY_CALL:
+      multi_callable = channel.unary_unary(method)
+      future = multi_callable.future(REQUEST)
+      result, call = multi_callable.with_call(REQUEST)
+    elif (args.scenario == IN_FLIGHT_UNARY_STREAM_CALL or
+          args.scenario == IN_FLIGHT_PARTIAL_UNARY_STREAM_CALL):
+      multi_callable = channel.unary_stream(method)
+      response_iterator = multi_callable(REQUEST)
+      for response in response_iterator:
+        pass
+    elif (args.scenario == IN_FLIGHT_STREAM_UNARY_CALL or
+          args.scenario == IN_FLIGHT_PARTIAL_STREAM_UNARY_CALL):
+      multi_callable = channel.stream_unary(method)
+      future = multi_callable.future(infinite_request_iterator())
+      result, call = multi_callable.with_call(
+          [REQUEST] * test_constants.STREAM_LENGTH)
+    elif (args.scenario == IN_FLIGHT_STREAM_STREAM_CALL or
+          args.scenario == IN_FLIGHT_PARTIAL_STREAM_STREAM_CALL):
+      multi_callable = channel.stream_stream(method)
+      response_iterator = multi_callable(infinite_request_iterator())
+      for response in response_iterator:
+        pass