def test_even_false(self):
     self.assertFalse(checker("abcd"))
 def test_odd_true(self):
     self.assertTrue(checker("abcdcba"))
 def test_case_true(self):
     self.assertTrue(checker("Abcba"))
 def test_even_true(self):
     self.assertTrue(checker("abccba"))
 def test_odd_false(self):
     self.assertFalse(checker("abcde"))