def test_given_no_extension_then_returns_none(self, find_by_line_id, extension_get):
line_id = 1
find_by_line_id.return_value = None
result = ule_service.find_extension(line_id)
assert_that(result, none())
def test_given_extension_associated_then_returns_extension(self, find_by_line_id, extension_get):
line_id = 1
find_by_line_id.return_value = Mock(LineExtension, extension_id=1)
extension = extension_get.return_value = Mock(Extension)
result = ule_service.find_extension(line_id)
assert_that(result, equal_to(extension))
