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diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/face/test_interfaces.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/face/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 Face layer."""
+
+import abc
+
+import six
+
+from grpc.framework.common import cardinality  # pylint: disable=unused-import
+from grpc.framework.interfaces.face import face  # pylint: disable=unused-import
+
+
+class Method(six.with_metaclass(abc.ABCMeta)):
+  """Specifies a method to be used in tests."""
+
+  @abc.abstractmethod
+  def group(self):
+    """Identify the group of the method.
+
+    Returns:
+      The group of the method.
+    """
+    raise NotImplementedError()
+
+  @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()
+
+
+class Implementation(six.with_metaclass(abc.ABCMeta)):
+  """Specifies an implementation of the Face layer."""
+
+  @abc.abstractmethod
+  def instantiate(
+      self, methods, method_implementations,
+      multi_method_implementation):
+    """Instantiates the Face layer implementation to be used in a test.
+
+    Args:
+      methods: A sequence of Method objects describing the methods available to
+        be called during the test.
+      method_implementations: A dictionary from group-name pair to
+        face.MethodImplementation object specifying implementation of a method.
+      multi_method_implementation: A face.MultiMethodImplementation or None.
+
+    Returns:
+      A sequence of length three the first element of which is a
+        face.GenericStub, the second element of which is dictionary from groups
+        to face.DynamicStubs affording invocation of the group's methods, and
+        the third element of which is an arbitrary memo object to be kept and
+        passed to destantiate at the conclusion of the test. The returned stubs
+        must be backed by the provided implementations.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def destantiate(self, memo):
+    """Destroys the Face 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_metadata(self):
+    """Provides the metadata to be used when invoking a test RPC.
+
+    Returns:
+      An object to use as the supplied-at-invocation-time metadata in a test
+        RPC.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def initial_metadata(self):
+    """Provides the metadata for use as a test RPC's first servicer metadata.
+
+    Returns:
+      An object to use as the from-the-servicer-before-responses metadata in a
+        test RPC.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def terminal_metadata(self):
+    """Provides the metadata for use as a test RPC's second servicer metadata.
+
+    Returns:
+      An object to use as the from-the-servicer-after-all-responses metadata in
+        a test RPC.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def code(self):
+    """Provides the value for use as a test RPC's code.
+
+    Returns:
+      An object to use as the from-the-servicer code in a test RPC.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def details(self):
+    """Provides the value for use as a test RPC's details.
+
+    Returns:
+      An object to use as the from-the-servicer details in a test RPC.
+    """
+    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 Face interface
+        implementation under test.
+      transmitted_metadata: The same metadata value after having been
+        transmitted via an RPC performed by the Face interface implementation
+          under test.
+
+    Returns:
+      Whether or not the metadata was properly transmitted by the Face interface
+        implementation under test.
+    """
+    raise NotImplementedError()