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diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_interfaces.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_interfaces.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.
+
+"""Interfaces used in tests of implementations of the Base layer."""
+
+import abc
+
+import six
+
+from grpc.framework.interfaces.base import base  # pylint: disable=unused-import
+
+
+class Serialization(six.with_metaclass(abc.ABCMeta)):
+  """Specifies serialization and deserialization of test payloads."""
+
+  def serialize_request(self, request):
+    """Serializes a request value used in a test.
+
+    Args:
+      request: A request value created by a test.
+
+    Returns:
+      A bytestring that is the serialization of the given request.
+    """
+    raise NotImplementedError()
+
+  def deserialize_request(self, serialized_request):
+    """Deserializes a request value used in a test.
+
+    Args:
+      serialized_request: A bytestring that is the serialization of some request
+        used in a test.
+
+    Returns:
+      The request value encoded by the given bytestring.
+    """
+    raise NotImplementedError()
+
+  def serialize_response(self, response):
+    """Serializes a response value used in a test.
+
+    Args:
+      response: A response value created by a test.
+
+    Returns:
+      A bytestring that is the serialization of the given response.
+    """
+    raise NotImplementedError()
+
+  def deserialize_response(self, serialized_response):
+    """Deserializes a response value used in a test.
+
+    Args:
+      serialized_response: A bytestring that is the serialization of some
+        response used in a test.
+
+    Returns:
+      The response value encoded by the given bytestring.
+    """
+    raise NotImplementedError()
+
+
+class Implementation(six.with_metaclass(abc.ABCMeta)):
+  """Specifies an implementation of the Base layer."""
+
+  @abc.abstractmethod
+  def instantiate(self, serializations, servicer):
+    """Instantiates the Base layer implementation to be used in a test.
+
+    Args:
+      serializations: A dict from group-method pair to Serialization object
+        specifying how to serialize and deserialize payload values used in the
+        test.
+      servicer: A base.Servicer object to be called to service RPCs made during
+        the test.
+
+    Returns:
+      A sequence of length three the first element of which is a
+        base.End to be used to invoke RPCs, the second element of which is a
+        base.End to be used to service invoked RPCs, and the third element of
+        which is an arbitrary memo object to be kept and passed to destantiate
+        at the conclusion of the test.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def destantiate(self, memo):
+    """Destroys the Base layer implementation under test.
+
+    Args:
+      memo: The object from the third position of the return value of a call to
+        instantiate.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def invocation_initial_metadata(self):
+    """Provides an operation's invocation-side initial metadata.
+
+    Returns:
+      A value to use for an operation's invocation-side initial metadata, or
+        None.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def service_initial_metadata(self):
+    """Provides an operation's service-side initial metadata.
+
+    Returns:
+      A value to use for an operation's service-side initial metadata, or
+        None.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def invocation_completion(self):
+    """Provides an operation's invocation-side completion.
+
+    Returns:
+      A base.Completion to use for an operation's invocation-side completion.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def service_completion(self):
+    """Provides an operation's service-side completion.
+
+    Returns:
+      A base.Completion to use for an operation's service-side completion.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def metadata_transmitted(self, original_metadata, transmitted_metadata):
+    """Identifies whether or not metadata was properly transmitted.
+
+    Args:
+      original_metadata: A metadata value passed to the system under test.
+      transmitted_metadata: The same metadata value after having been
+        transmitted through the system under test.
+
+    Returns:
+      Whether or not the metadata was properly transmitted.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def completion_transmitted(self, original_completion, transmitted_completion):
+    """Identifies whether or not a base.Completion was properly transmitted.
+
+    Args:
+      original_completion: A base.Completion passed to the system under test.
+      transmitted_completion: The same completion value after having been
+        transmitted through the system under test.
+
+    Returns:
+      Whether or not the completion was properly transmitted.
+    """
+    raise NotImplementedError()