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    <p>This question was answered <a href="http://mail.python.org/pipermail/python-list/2012-October/632388.html">by Peter Otten on comp.lang.python</a>.</p> <p>Move MyTestCase in a separate module and define a global variable <code>__unittest = True</code>.</p> <pre class="lang-none prettyprint-override"><code>$ cat mytestcase.py import unittest __unittest = True class MyTestCase(unittest.TestCase): def assertLengthIsOne(self, sequence, msg=None): if len(sequence) != 1: msg = self._formatMessage(msg, "length is not one") raise self.failureException(msg) $ cat mytestcase_demo.py import unittest from mytestcase import MyTestCase class TestFoo(MyTestCase): seq = (1, 2, 3, 4, 5) def test_stock_unittest_assertion(self): self.assertEqual(len(self.seq), 1) def test_custom_assertion(self): self.assertLengthIsOne(self.seq) if __name__ == "__main__": unittest.main() $ python mytestcase_demo.py FF ====================================================================== FAIL: test_custom_assertion (__main__.TestFoo) ---------------------------------------------------------------------- Traceback (most recent call last): File "mytestcase_demo.py", line 11, in test_custom_assertion self.assertLengthIsOne(self.seq) AssertionError: length is not one ====================================================================== FAIL: test_stock_unittest_assertion (__main__.TestFoo) ---------------------------------------------------------------------- Traceback (most recent call last): File "mytestcase_demo.py", line 8, in test_stock_unittest_assertion self.assertEqual(len(self.seq), 1) AssertionError: 5 != 1 ---------------------------------------------------------------------- Ran 2 tests in 0.000s FAILED (failures=2) $ </code></pre>
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    1. COI cannot believe this question/answer have not received more votes! Great information & exactly why I <3 SO.
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