def test_true_2(self): self.assertTrue(is_palindrome('Amor, Roma'))
def test_true(self): self.assertTrue(is_palindrome('race car'))
def test_false(self): self.assertFalse(is_palindrome(None))
def test_false_2(self): self.assertFalse(is_palindrome('aaaaza'))
def test_true_3(self): self.assertTrue(is_palindrome('No \'x\' in Nixon'))