Method assertIsNot

Lib/unittest/case.py:1208–1212

Just like self.assertTrue(a is not b), but with a nicer default message.

(self, expr1, expr2, msg=None)

            self.fail(self._formatMessage(msg, standardMsg))

    def assertIsNot(self, expr1, expr2, msg=None):
        """Just like self.assertTrue(a is not b), but with a nicer default message."""
        if expr1 is expr2:
            standardMsg = 'unexpectedly identical: %s' % (safe_repr(expr1),)
            self.fail(self._formatMessage(msg, standardMsg))

    def assertDictEqual(self, d1, d2, msg=None):
        self.assertIsInstance(d1, dict, 'First argument is not a dictionary')