def test_empty_string(self):
self.assertIs(is_isogram(""), True)
def test_duplicated_character_in_the_middle(self):
self.assertIs(is_isogram("accentor"), False)
def test_isogram_with_duplicated_letter_and_nonletter_character(self):
self.assertIs(is_isogram("Aleph Bot Chap"), False)
def test_isogram_with_duplicated_hyphen(self):
self.assertIs(is_isogram("six-year-old"), True)
def test_made_up_name_that_is_an_isogram(self):
self.assertIs(is_isogram("Emily Jung Schwartzkopf"), True)
def test_hypothetical_isogrammic_word_with_hyphen(self):
self.assertIs(is_isogram("thumbscrew-japingly"), True)
def test_word_with_duplicated_character_in_mixed_case(self):
self.assertIs(is_isogram("Alphabet"), False)
def test_longest_reported_english_isogram(self):
self.assertIs(is_isogram("subdermatoglyphic"), True)
def test_word_with_one_duplicated_character(self):
self.assertIs(is_isogram("eleven"), False)
def test_isogram_with_only_lower_case_characters(self):
self.assertIs(is_isogram("isogram"), True)