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diff --git a/src/python/_framework/face/testing/callback.py b/src/python/_framework/face/testing/callback.py
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+++ b/src/python/_framework/face/testing/callback.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.
+
+"""A utility useful in tests of asynchronous, event-driven interfaces."""
+
+import threading
+
+from _framework.foundation import stream
+
+
+class Callback(stream.Consumer):
+  """A utility object useful in tests of asynchronous code."""
+
+  def __init__(self):
+    self._condition = threading.Condition()
+    self._unary_response = None
+    self._streamed_responses = []
+    self._completed = False
+    self._abortion = None
+
+  def abort(self, abortion):
+    with self._condition:
+      self._abortion = abortion
+      self._condition.notify_all()
+
+  def complete(self, unary_response):
+    with self._condition:
+      self._unary_response = unary_response
+      self._completed = True
+      self._condition.notify_all()
+
+  def consume(self, streamed_response):
+    with self._condition:
+      self._streamed_responses.append(streamed_response)
+
+  def terminate(self):
+    with self._condition:
+      self._completed = True
+      self._condition.notify_all()
+
+  def consume_and_terminate(self, streamed_response):
+    with self._condition:
+      self._streamed_responses.append(streamed_response)
+      self._completed = True
+      self._condition.notify_all()
+
+  def block_until_terminated(self):
+    with self._condition:
+      while self._abortion is None and not self._completed:
+        self._condition.wait()
+
+  def response(self):
+    with self._condition:
+      if self._abortion is None:
+        return self._unary_response
+      else:
+        raise AssertionError('Aborted with abortion "%s"!' % self._abortion)
+
+  def responses(self):
+    with self._condition:
+      if self._abortion is None:
+        return list(self._streamed_responses)
+      else:
+        raise AssertionError('Aborted with abortion "%s"!' % self._abortion)
+
+  def abortion(self):
+    with self._condition:
+      return self._abortion