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diff --git a/catapult/telemetry/third_party/mox3/mox3/tests/mox_helper.py b/catapult/telemetry/third_party/mox3/mox3/tests/mox_helper.py
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+# 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.
+#
+#
+# This is a fork of the pymox library intended to work with Python 3.
+# The file was modified by quermit@gmail.com and dawid.fatyga@gmail.com
+
+"""A very basic test class derived from mox.MoxTestBase, used by test_mox.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
+test_mox.py test suite.
+
+See test_mox.MoxTestBaseTest for how this class is actually used.
+"""
+
+import os
+
+from mox3 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)
+
+    def testHasStubs(self):
+        listdir_list = []
+
+        def MockListdir(directory):
+            listdir_list.append(directory)
+
+        self.stubs.Set(os, 'listdir', MockListdir)
+        os.listdir(self.DIR_PATH)
+        self.assertEqual([self.DIR_PATH], listdir_list)
+
+
+class TestClassFromAnotherModule(object):
+
+    def __init__(self):
+        return None
+
+    def Value(self):
+        return 'Not mock'
+
+
+class ChildClassFromAnotherModule(TestClassFromAnotherModule):
+    """A child class of TestClassFromAnotherModule.
+
+    Used to test stubbing out unbound methods, where child classes
+    are eventually bound.
+    """
+
+    def __init__(self):
+        TestClassFromAnotherModule.__init__(self)
+
+
+class CallableClass(object):
+
+    def __init__(self, one, two, nine=None):
+        pass
+
+    def __call__(self, one):
+        return 'Not mock'
+
+    def Value(self):
+        return 'Not mock'
+
+
+def MyTestFunction(one, two, nine=None):
+    pass
+
+
+class ExampleClass(object):
+    def __init__(self, foo='bar'):
+        pass
+
+    def TestMethod(self, one, two, nine=None):
+        pass
+
+    def NamedParams(self, ignore, foo='bar', baz='qux'):
+        pass
+
+    def SpecialArgs(self, *args, **kwargs):
+        pass
+
+
+# This class is used to test stubbing out __init__ of a parent class.
+class ChildExampleClass(ExampleClass):
+    def __init__(self):
+        ExampleClass.__init__(self)