def test__gcd__when_one_of_numbers_is_zero__then_another_number():
# given
number = 96
# when
result = gcd(number, 0)
# then
assert_that(result).is_equal_to(number)
def test__gcd__when_one_of_numbers_is_multiple_of_another__then_less_number(
):
# given
number = 34
# when
result = gcd(number, number * 6)
# then
assert_that(result).is_equal_to(number)
def test__gcd__when_numbers_are_prime__then_one():
# when
result = gcd(127, 41)
# then
assert_that(result).is_equal_to(1)
def test__gcd__when_numbers_are_mutually_prime__then_one():
# when
result = gcd(119, 57)
# then
assert_that(result).is_equal_to(1)
def test__gcd__when_numbers_are_composite__then_gcd():
# when
result = gcd(161, 46)
# then
assert_that(result).is_equal_to(23)