def test_string_should_be_9_plus_one(self):
captcha = Captcha(2, 9, 1, 1)
self.assertEqual("9 + one", captcha.string())
def test_string_should_be_one_plus_9(self):
captcha = Captcha(1, 1, 1, 9)
self.assertEqual("one + 9", captcha.string())
