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diff --git a/src/python/grpcio_test/grpc_interop/_interop_test_case.py b/src/python/grpcio_test/grpc_interop/_interop_test_case.py
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+++ b/src/python/grpcio_test/grpc_interop/_interop_test_case.py
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+# 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 code for unit tests of the interoperability test code."""
+
+from grpc_interop import methods
+
+
+class InteropTestCase(object):
+  """Unit test methods.
+
+  This class must be mixed in with unittest.TestCase and a class that defines
+  setUp and tearDown methods that manage a stub attribute.
+  """
+
+  def testEmptyUnary(self):
+    methods.TestCase.EMPTY_UNARY.test_interoperability(self.stub, None)
+
+  def testLargeUnary(self):
+    methods.TestCase.LARGE_UNARY.test_interoperability(self.stub, None)
+
+  def testServerStreaming(self):
+    methods.TestCase.SERVER_STREAMING.test_interoperability(self.stub, None)
+
+  def testClientStreaming(self):
+    methods.TestCase.CLIENT_STREAMING.test_interoperability(self.stub, None)
+
+  def testPingPong(self):
+    methods.TestCase.PING_PONG.test_interoperability(self.stub, None)
+
+  def testCancelAfterBegin(self):
+    methods.TestCase.CANCEL_AFTER_BEGIN.test_interoperability(self.stub, None)
+
+  def testCancelAfterFirstResponse(self):
+    methods.TestCase.CANCEL_AFTER_FIRST_RESPONSE.test_interoperability(self.stub, None)