'If a message is specified as L{None}, it is not included in the error
message of L{assertEqual}.'

def test_assertEqualNoneMessage(self):

    exceptionForNone = self.assertRaises(self.failureException, self.assertEqual, 'foo', 'bar', None)
    exceptionWithout = self.assertRaises(self.failureException, self.assertEqual, 'foo', 'bar')
    self.assertEqual(str(exceptionWithout), str(exceptionForNone))
