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diff --git a/python/google/protobuf/internal/api_implementation_default_test.py b/python/google/protobuf/internal/api_implementation_default_test.py
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+++ b/python/google/protobuf/internal/api_implementation_default_test.py
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+#! /usr/bin/python
+#
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# http://code.google.com/p/protobuf/
+#
+# 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.
+
+"""Test that the api_implementation defaults are what we expect."""
+
+import os
+import sys
+# Clear environment implementation settings before the google3 imports.
+os.environ.pop('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION', None)
+os.environ.pop('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION', None)
+
+# pylint: disable=g-import-not-at-top
+from google.apputils import basetest
+from google.protobuf.internal import api_implementation
+
+
+class ApiImplementationDefaultTest(basetest.TestCase):
+
+  if sys.version_info.major <= 2:
+
+    def testThatPythonIsTheDefault(self):
+      """If -DPYTHON_PROTO_*IMPL* was given at build time, this may fail."""
+      self.assertEqual('python', api_implementation.Type())
+
+  else:
+
+    def testThatCppApiV2IsTheDefault(self):
+      """If -DPYTHON_PROTO_*IMPL* was given at build time, this may fail."""
+      self.assertEqual('cpp', api_implementation.Type())
+      self.assertEqual(2, api_implementation.Version())
+
+
+if __name__ == '__main__':
+  basetest.main()