def test_check_digit_is_correct(self):
isbn = ISBN10(group='1', registrant='4516', publication='7331')
assert isbn.check_digit == '0'
isbn = ISBN10(group='0', registrant='06', publication='230125')
assert isbn.check_digit == 'X'
isbn = ISBN10(group='1', registrant='4936', publication='8222')
assert isbn.check_digit == '9'
def test_check_digit_is_correct(self):
isbn = ISBN10(group="1", registrant="4516", publication="7331")
assert isbn.check_digit == "0"
isbn = ISBN10(group="0", registrant="06", publication="230125")
assert isbn.check_digit == "X"
isbn = ISBN10(group="1", registrant="4936", publication="8222")
assert isbn.check_digit == "9"
def test_format_length(self):
isbn = ISBN10(group='1', registrant='4516', publication='7331')
assert len(isbn.format()) == 10
def test_format_length(self):
isbn = ISBN10(group="1", registrant="4516", publication="7331")
assert len(isbn.format()) == 10