def test_to_roman_known_values(self):
'''`to_roman` should give known result with known input'''
for integer, numeral in self.known_values:
result = arb2rom2arb.to_roman(integer)
self.assertEqual(numeral, result)
def test_roundtrip(self):
'''the output of `from_roman(to_roman(n)) should equal to n'''
for integer in range(1, 4000):
numeral = arb2rom2arb.to_roman(integer)
result = arb2rom2arb.from_roman(numeral)
self.assertEqual(integer, result)
