def test_non_palidromes2(self): self.assertEqual('nomolos', reverse_string('solomon'), msg='should return `nomolos` for `solomon`')
def test_non_palidromes3(self): self.assertEqual('csim', reverse_string('misc'), msg='should return `csim` for `misc`')
def test_non_palidromes1(self): self.assertEqual('skoob', reverse_string('books'), msg='should return `skoob` for `books`')
def test_palidromes3(self): self.assertTrue(reverse_string('civic'), msg='should return true for `civic`')
def test_palidromes2(self): self.assertTrue(reverse_string('NaN'), msg='should return true for `NaN`')
def test_palidromes1(self): self.assertTrue(reverse_string('anna'), msg='should return true for `anna`')
def test_empty_string(self): self.assertIsNone(reverse_string(''), msg='should return `None` for empty string')