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diff --git a/mox_test_helper.py b/mox_test_helper.py
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+++ b/mox_test_helper.py
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+#!/usr/bin/python2.4
+#
+# Copyright 2008 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""A very basic test class derived from mox.MoxTestBase, used by mox_test.py.
+
+The class defined in this module is used to test the features of
+MoxTestBase and is not intended to be a standalone test.  It needs to
+be in a separate module, because otherwise the tests in this class
+(which should not all pass) would be executed as part of the
+mox_test.py test suite.
+
+See mox_test.MoxTestBaseTest for how this class is actually used.
+"""
+
+import os
+
+import mox
+
+class ExampleMoxTestMixin(object):
+  """Mix-in class for mox test case class.
+
+  It stubs out the same function as one of the test methods in
+  the example test case.  Both tests must pass as meta class wraps
+  test methods in all base classes.
+  """
+
+  def testStat(self):
+    self.mox.StubOutWithMock(os, 'stat')
+    os.stat(self.DIR_PATH)
+    self.mox.ReplayAll()
+    os.stat(self.DIR_PATH)
+
+
+class ExampleMoxTest(mox.MoxTestBase, ExampleMoxTestMixin):
+
+  DIR_PATH = '/path/to/some/directory'
+
+  def testSuccess(self):
+    self.mox.StubOutWithMock(os, 'listdir')
+    os.listdir(self.DIR_PATH)
+    self.mox.ReplayAll()
+    os.listdir(self.DIR_PATH)
+
+  def testExpectedNotCalled(self):
+    self.mox.StubOutWithMock(os, 'listdir')
+    os.listdir(self.DIR_PATH)
+    self.mox.ReplayAll()
+
+  def testUnexpectedCall(self):
+    self.mox.StubOutWithMock(os, 'listdir')
+    os.listdir(self.DIR_PATH)
+    self.mox.ReplayAll()
+    os.listdir('/path/to/some/other/directory')
+    os.listdir(self.DIR_PATH)
+
+  def testFailure(self):
+    self.assertTrue(False)
+
+  def testStatOther(self):
+    self.mox.StubOutWithMock(os, 'stat')
+    os.stat(self.DIR_PATH)
+    self.mox.ReplayAll()
+    os.stat(self.DIR_PATH)