'Test an error with assertNotIsInstance.'

def test_assertNotIsInstanceError(self):

    A = type('A', (object,), {})
    a = A()
    error = self.assertRaises(self.failureException, self.assertNotIsInstance, a, A)
    self.assertEqual(str(error), ('%r    is    an    instance    of    %s' % (a, A)))
