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diff --git a/tests/testcompat.py b/tests/testcompat.py
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+++ b/tests/testcompat.py
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+# Copyright (c) 2011 Martin Vilcans
+# Licensed under the MIT license:
+# http://www.opensource.org/licenses/mit-license.php
+
+"""Provides compatibility between Python 2 and 3.
+
+In Python 2 we use the unittest2 module.
+The functionality of that module is already in Python 3,
+so we don't depend on it.
+This module exports the TestCase class from whatever unittest library we have.
+
+"""
+
+try:
+    from unittest2 import TestCase
+except ImportError:
+    from unittest import TestCase