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diff --git a/python/google/protobuf/pyext/reflection_cpp2_generated_test.py b/python/google/protobuf/pyext/reflection_cpp2_generated_test.py
new file mode 100755
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+++ b/python/google/protobuf/pyext/reflection_cpp2_generated_test.py
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+#! /usr/bin/python
+# -*- coding: utf-8 -*-
+#
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# 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.
+
+"""Unittest for reflection.py, which tests the generated C++ implementation."""
+
+__author__ = 'jasonh@google.com (Jason Hsueh)'
+
+import os
+os.environ['PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION'] = 'cpp'
+os.environ['PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION'] = '2'
+
+from google.apputils import basetest
+from google.protobuf.internal import api_implementation
+from google.protobuf.internal import more_extensions_dynamic_pb2
+from google.protobuf.internal import more_extensions_pb2
+from google.protobuf.internal.reflection_test import *
+
+
+class ReflectionCppTest(basetest.TestCase):
+  def testImplementationSetting(self):
+    self.assertEqual('cpp', api_implementation.Type())
+    self.assertEqual(2, api_implementation.Version())
+
+  def testExtensionOfGeneratedTypeInDynamicFile(self):
+    """Tests that a file built dynamically can extend a generated C++ type.
+
+    The C++ implementation uses a DescriptorPool that has the generated
+    DescriptorPool as an underlay. Typically, a type can only find
+    extensions in its own pool. With the python C-extension, the generated C++
+    extendee may be available, but not the extension. This tests that the
+    C-extension implements the correct special handling to make such extensions
+    available.
+    """
+    pb1 = more_extensions_pb2.ExtendedMessage()
+    # Test that basic accessors work.
+    self.assertFalse(
+        pb1.HasExtension(more_extensions_dynamic_pb2.dynamic_int32_extension))
+    self.assertFalse(
+        pb1.HasExtension(more_extensions_dynamic_pb2.dynamic_message_extension))
+    pb1.Extensions[more_extensions_dynamic_pb2.dynamic_int32_extension] = 17
+    pb1.Extensions[more_extensions_dynamic_pb2.dynamic_message_extension].a = 24
+    self.assertTrue(
+        pb1.HasExtension(more_extensions_dynamic_pb2.dynamic_int32_extension))
+    self.assertTrue(
+        pb1.HasExtension(more_extensions_dynamic_pb2.dynamic_message_extension))
+
+    # Now serialize the data and parse to a new message.
+    pb2 = more_extensions_pb2.ExtendedMessage()
+    pb2.MergeFromString(pb1.SerializeToString())
+
+    self.assertTrue(
+        pb2.HasExtension(more_extensions_dynamic_pb2.dynamic_int32_extension))
+    self.assertTrue(
+        pb2.HasExtension(more_extensions_dynamic_pb2.dynamic_message_extension))
+    self.assertEqual(
+        17, pb2.Extensions[more_extensions_dynamic_pb2.dynamic_int32_extension])
+    self.assertEqual(
+        24,
+        pb2.Extensions[more_extensions_dynamic_pb2.dynamic_message_extension].a)
+
+
+
+if __name__ == '__main__':
+  basetest.main()