def test_exceptions(self):
ancient = 'The ancient Romans did not recognize 0 as a number neither did they include negative numbers'
try:
_ = Roman.convert_to_roman(0)
self.fail('Should get an exception for non-positive values')
except ValueError as ex:
self.assertEqual(ancient, str(ex))
try:
_ = Roman.convert_to_roman(-22)
self.fail('Should get an exception for non-positive values')
except ValueError as ex:
self.assertEqual(ancient, str(ex))
try:
_ = Roman.convert_to_decimal('T') # T unknown
self.fail('Should get an exception for unrecognized characters')
except ValueError as ex:
self.assertEqual('Not found', str(ex))
try:
_ = Roman.convert_to_decimal(
'IIII') # III is 3 and cannot be followed by anything
self.fail('Should get an exception for unrecognized characters')
except ValueError as ex:
self.assertEqual('Wrong level', str(ex))
try:
# not following the convention - XX is 20 and cannot be followed by 50
_ = Roman.convert_to_decimal('XXL')
self.fail('Should get an exception for unrecognized characters')
except ValueError as ex:
self.assertEqual('Wrong level', str(ex))
try:
_ = Roman.convert_to_decimal(
'MMCCXXC') # 2220 cannot be followed by 100
self.fail('Should get an exception for unrecognized characters')
except ValueError as ex:
self.assertEqual('Wrong level', str(ex))
try:
_ = Roman.convert_to_decimal(
'I^'
) # with the current convention I can never be followed by a ^
self.fail('Should get an exception for unrecognized characters')
except ValueError as ex:
self.assertEqual('Not found', str(ex))
try:
_ = Roman.convert_to_decimal('V^MMMDCCCLXXXVIIIR') # R unknown
self.fail('Should get an exception for unrecognized characters')
except ValueError as ex:
self.assertEqual('Not found', str(ex))
def test_conversion(self): # happy path
try:
test_numbers = [
1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 14, 15, 16, 19, 20, 21, 29, 30,
40, 50, 60, 70, 90, 100, 110, 111, 119, 120, 140, 149, 150,
199, 200, 300, 400, 500, 600, 700, 900, 999, 1000, 1499, 1500,
1501, 1900, 1999, 2222, 2999, 3333, 3999, 4444, 4999, 5555,
5999, 6666, 6999, 7777, 7999, 8888, 8999, 9999, 10000, 10001,
10004, 10005, 10006, 10009, 10010, 10019, 10022, 10029, 10033,
10039, 10044, 10049, 10055, 10059, 10066, 10069, 10077, 10079,
10089, 10099, 10100, 10111, 10199, 10222, 10333, 10444, 10555,
10666, 10777, 10888, 10999, 11111, 12222, 13333, 14444, 15555,
16666, 17777, 18888, 19999, 20000, 22222, 33333, 44444, 55555,
66666, 77777, 88888, 99999, 100000, 111111, 222222, 333333,
444444, 555555, 666666, 777777, 888888, 999999, 1000000,
999999999
]
test_romans = [
'I', 'II', 'III', 'IV', 'V', 'VI', 'VIII', 'IX', 'X', 'XI',
'XIV', 'XV', 'XVI', 'XIX', 'XX', 'XXI', 'XXIX', 'XXX', 'XL',
'L', 'LX', 'LXX', 'XC', 'C', 'CX', 'CXI', 'CXIX', 'CXX', 'CXL',
'CXLIX', 'CL', 'CXCIX', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC',
'CM', 'CMXCIX', 'M', 'MCDXCIX', 'MD', 'MDI', 'MCM', 'MCMXCIX',
'MMCCXXII', 'MMCMXCIX', 'MMMCCCXXXIII', 'MMMCMXCIX',
'MV^CDXLIV', 'MV^CMXCIX', 'V^DLV', 'V^CMXCIX', 'V^MDCLXVI',
'V^MCMXCIX', 'V^MMDCCLXXVII', 'V^MMCMXCIX',
'V^MMMDCCCLXXXVIII', 'V^MMMCMXCIX', 'MX^CMXCIX', 'X^', 'X^I',
'X^IV', 'X^V', 'X^VI', 'X^IX', 'X^X', 'X^XIX', 'X^XXII',
'X^XXIX', 'X^XXXIII', 'X^XXXIX', 'X^XLIV', 'X^XLIX', 'X^LV',
'X^LIX', 'X^LXVI', 'X^LXIX', 'X^LXXVII', 'X^LXXIX', 'X^LXXXIX',
'X^XCIX', 'X^C', 'X^CXI', 'X^CXCIX', 'X^CCXXII', 'X^CCCXXXIII',
'X^CDXLIV', 'X^DLV', 'X^DCLXVI', 'X^DCCLXXVII',
'X^DCCCLXXXVIII', 'X^CMXCIX', 'X^MCXI', 'X^MMCCXXII',
'X^MMMCCCXXXIII', 'X^MV^CDXLIV', 'X^V^DLV', 'X^V^MDCLXVI',
'X^V^MMDCCLXXVII', 'X^V^MMMDCCCLXXXVIII', 'X^MX^CMXCIX',
'X^X^', 'X^X^MMCCXXII', 'X^X^X^MMMCCCXXXIII', 'X^L^MV^CDXLIV',
'L^V^DLV', 'L^X^V^MDCLXVI', 'L^X^X^V^MMDCCLXXVII',
'L^X^X^X^V^MMMDCCCLXXXVIII', 'X^C^MX^CMXCIX', 'C^', 'C^X^MCXI',
'C^C^X^X^MMCCXXII', 'C^C^C^X^X^X^MMMCCCXXXIII',
'C^D^X^L^MV^CDXLIV', 'D^L^V^DLV', 'D^C^L^X^V^MDCLXVI',
'D^C^C^L^X^X^V^MMDCCLXXVII',
'D^C^C^C^L^X^X^X^V^MMMDCCCLXXXVIII', 'C^M^X^C^MX^CMXCIX', 'M^',
'C^^M^^X^^C^^M^X^^C^M^X^C^MX^CMXCIX'
]
for idx in range(len(test_numbers)):
self.assertEqual(test_romans[idx],
Roman.convert_to_roman(test_numbers[idx]))
Roman._cache_decimal.clear(
) # clear the caches to really test the back conversion
Roman._cache_roman.clear()
for idx in range(len(test_romans)):
self.assertEqual(test_numbers[idx],
Roman.convert_to_decimal(test_romans[idx]))
for idx in range(len(test_numbers)): # test cache
self.assertEqual(test_romans[idx],
Roman.convert_to_roman(test_numbers[idx]))
except ValueError as ex:
self.fail('Failed with - {}'.format(ex))