def test_true_2(self): self.assertTrue(is_isogram('isogram'))
def test_true(self): self.assertTrue(is_isogram('Dermatoglyphics'))
def test_false_3(self): self.assertFalse(is_isogram('isIsogram'))
def test_false_2(self): self.assertFalse(is_isogram('moOse'))
def test_false(self): self.assertFalse(is_isogram('aba'))
def test_true_3(self): self.assertTrue(is_isogram(''))