def test_decode_throws_input_error_if_input_is_not_a_string_or_is_empty(
self):
# noinspection PyTypeChecker
self.assertRaises(ValueError, lambda: roman_decode(None))
# noinspection PyTypeChecker
self.assertRaises(ValueError, lambda: roman_decode(42))
# noinspection PyTypeChecker
self.assertRaises(ValueError, lambda: roman_decode(True))
self.assertRaises(ValueError, lambda: roman_decode(''))
self.assertRaises(ValueError, lambda: roman_decode(' '))
def test_units_are_decoded_as_expected(self):
self.assertEqual(roman_decode('I'), 1)
self.assertEqual(roman_decode('II'), 2)
self.assertEqual(roman_decode('III'), 3)
self.assertEqual(roman_decode('IV'), 4)
self.assertEqual(roman_decode('V'), 5)
self.assertEqual(roman_decode('VI'), 6)
self.assertEqual(roman_decode('VII'), 7)
self.assertEqual(roman_decode('VIII'), 8)
self.assertEqual(roman_decode('IX'), 9)
def test_tens_are_decoded_as_expected(self):
self.assertEqual(roman_decode('X'), 10)
self.assertEqual(roman_decode('XX'), 20)
self.assertEqual(roman_decode('XXX'), 30)
self.assertEqual(roman_decode('XL'), 40)
self.assertEqual(roman_decode('L'), 50)
self.assertEqual(roman_decode('LX'), 60)
self.assertEqual(roman_decode('LXX'), 70)
self.assertEqual(roman_decode('LXXX'), 80)
self.assertEqual(roman_decode('XC'), 90)
def test_hundreds_are_decoded_as_expected(self):
self.assertEqual(100, roman_decode('C'))
self.assertEqual(200, roman_decode('CC'))
self.assertEqual(300, roman_decode('CCC'))
self.assertEqual(400, roman_decode('CD'))
self.assertEqual(500, roman_decode('D'))
self.assertEqual(600, roman_decode('DC'))
self.assertEqual(700, roman_decode('DCC'))
self.assertEqual(800, roman_decode('DCCC'))
self.assertEqual(900, roman_decode('CM'))
def test_decode_raise_exception_for_unexpected_sign(self):
with self.assertRaises(ValueError) as raised:
roman_decode('wtf?')
self.assertEqual(str(raised.exception), 'Invalid token found: "?"')
with self.assertRaises(ValueError) as raised:
roman_decode('OK')
self.assertEqual(str(raised.exception), 'Invalid token found: "K"')
with self.assertRaises(ValueError) as raised:
roman_decode('QMMMCMXCIX')
self.assertEqual(str(raised.exception), 'Invalid token found: "Q"')
def test_tens_and_units_are_decoded_as_expected(self):
# 1x
self.assertEqual(11, roman_decode('XI'))
self.assertEqual(12, roman_decode('XII'))
self.assertEqual(13, roman_decode('XIII'))
self.assertEqual(14, roman_decode('XIV'))
self.assertEqual(15, roman_decode('XV'))
self.assertEqual(16, roman_decode('XVI'))
self.assertEqual(17, roman_decode('XVII'))
self.assertEqual(18, roman_decode('XVIII'))
self.assertEqual(19, roman_decode('XIX'))
# 2x
self.assertEqual(21, roman_decode('XXI'))
self.assertEqual(22, roman_decode('XXII'))
self.assertEqual(23, roman_decode('XXIII'))
self.assertEqual(24, roman_decode('XXIV'))
self.assertEqual(25, roman_decode('XXV'))
self.assertEqual(26, roman_decode('XXVI'))
self.assertEqual(27, roman_decode('XXVII'))
self.assertEqual(28, roman_decode('XXVIII'))
self.assertEqual(29, roman_decode('XXIX'))
# 3x
self.assertEqual(31, roman_decode('XXXI'))
self.assertEqual(32, roman_decode('XXXII'))
self.assertEqual(33, roman_decode('XXXIII'))
self.assertEqual(34, roman_decode('XXXIV'))
self.assertEqual(35, roman_decode('XXXV'))
self.assertEqual(36, roman_decode('XXXVI'))
self.assertEqual(37, roman_decode('XXXVII'))
self.assertEqual(38, roman_decode('XXXVIII'))
self.assertEqual(39, roman_decode('XXXIX'))
# 4x
self.assertEqual(41, roman_decode('XLI'))
self.assertEqual(42, roman_decode('XLII'))
self.assertEqual(43, roman_decode('XLIII'))
self.assertEqual(44, roman_decode('XLIV'))
self.assertEqual(45, roman_decode('XLV'))
self.assertEqual(46, roman_decode('XLVI'))
self.assertEqual(47, roman_decode('XLVII'))
self.assertEqual(48, roman_decode('XLVIII'))
self.assertEqual(49, roman_decode('XLIX'))
# 5x
self.assertEqual(51, roman_decode('LI'))
self.assertEqual(52, roman_decode('LII'))
self.assertEqual(53, roman_decode('LIII'))
self.assertEqual(54, roman_decode('LIV'))
self.assertEqual(55, roman_decode('LV'))
self.assertEqual(56, roman_decode('LVI'))
self.assertEqual(57, roman_decode('LVII'))
self.assertEqual(58, roman_decode('LVIII'))
self.assertEqual(59, roman_decode('LIX'))
# 6x
self.assertEqual(61, roman_decode('LXI'))
self.assertEqual(62, roman_decode('LXII'))
self.assertEqual(63, roman_decode('LXIII'))
self.assertEqual(64, roman_decode('LXIV'))
self.assertEqual(65, roman_decode('LXV'))
self.assertEqual(66, roman_decode('LXVI'))
self.assertEqual(67, roman_decode('LXVII'))
self.assertEqual(68, roman_decode('LXVIII'))
self.assertEqual(69, roman_decode('LXIX'))
# 7x
self.assertEqual(71, roman_decode('LXXI'))
self.assertEqual(72, roman_decode('LXXII'))
self.assertEqual(73, roman_decode('LXXIII'))
self.assertEqual(74, roman_decode('LXXIV'))
self.assertEqual(75, roman_decode('LXXV'))
self.assertEqual(76, roman_decode('LXXVI'))
self.assertEqual(77, roman_decode('LXXVII'))
self.assertEqual(78, roman_decode('LXXVIII'))
self.assertEqual(79, roman_decode('LXXIX'))
# 8x
self.assertEqual(81, roman_decode('LXXXI'))
self.assertEqual(82, roman_decode('LXXXII'))
self.assertEqual(83, roman_decode('LXXXIII'))
self.assertEqual(84, roman_decode('LXXXIV'))
self.assertEqual(85, roman_decode('LXXXV'))
self.assertEqual(86, roman_decode('LXXXVI'))
self.assertEqual(87, roman_decode('LXXXVII'))
self.assertEqual(88, roman_decode('LXXXVIII'))
self.assertEqual(89, roman_decode('LXXXIX'))
# 9x
self.assertEqual(91, roman_decode('XCI'))
self.assertEqual(92, roman_decode('XCII'))
self.assertEqual(93, roman_decode('XCIII'))
self.assertEqual(94, roman_decode('XCIV'))
self.assertEqual(95, roman_decode('XCV'))
self.assertEqual(96, roman_decode('XCVI'))
self.assertEqual(97, roman_decode('XCVII'))
self.assertEqual(98, roman_decode('XCVIII'))
self.assertEqual(99, roman_decode('XCIX'))
def test_decode_does_not_care_about_case(self):
self.assertEqual(3, roman_decode('iii'))
self.assertEqual(30, roman_decode('xxx'))
self.assertEqual(82, roman_decode('lxxxii'))
self.assertEqual(roman_decode('VII'), roman_decode('vii'))
self.assertEqual(roman_decode('VII'), roman_decode('Vii'))
def test_combined_numbers_decode(self):
self.assertEqual(3001, roman_decode('MMMI'))
self.assertEqual(3090, roman_decode('MMMXC'))
self.assertEqual(1200, roman_decode('MCC'))
self.assertEqual(2739, roman_decode('MMDCCXXXIX'))
self.assertEqual(3999, roman_decode('MMMCMXCIX'))
def test_thousands_are_decoded_as_expected(self):
self.assertEqual(1000, roman_decode('M'))
self.assertEqual(2000, roman_decode('MM'))
self.assertEqual(3000, roman_decode('MMM'))