def test_malformed_antecedents():
'''from_roman should fail with malformed antecedents'''
for s in ('IIMXCC', 'VX', 'DCM', 'CMM', 'IXIV', 'MCMC', 'XCX', 'IVI', 'LM',
'LD', 'LC'):
#raise InvalidRomanNumeralError('fail with malformed antecedents', s)
with pytest.raises(InvalidRomanNumeralError):
from_roman(s)
def test_Blank():
'''from_roman should fail with blank string'''
s = ''
with pytest.raises(InvalidRomanNumeralError):
from_roman(s)
def test_repeated_pairs():
'''from_roman should fail with repeated pairs of numerals'''
for s in ('CMCM', 'CDCD', 'XCXC', 'XLXL', 'IXIX', 'IVIV'):
#raise InvalidRomanNumeralError('repeated pairs of numerals', s)
with pytest.raises(InvalidRomanNumeralError):
from_roman(s)
def test_too_many_repeated_numerals():
'''from_roman should fail with too many repeated numerals'''
for s in ('MMMMM', 'DD', 'CCCC', 'LL', 'XXXX', 'VV', 'IIII'):
with pytest.raises(InvalidRomanNumeralError):
from_roman(s)
def test_from_roman_known_values(integer, roman):
'testuje fci from_roman'
assert from_roman(roman) == integer
def test_roundtrip():
for integer in range(1, 5000):
roman = to_roman(integer)
result = from_roman(roman)
assert integer == result