def test_input_MDCCLXXVI_output_1776():
assert roman_to_int("MDCCLXXVI") == 1776
def test_input_IX_output_9():
assert roman_to_int("IX") == 9
def test_input_XCIV_output_94():
assert roman_to_int("XCIV") == 94
def test_input_XLII_output_42():
assert roman_to_int("XLII") == 42
def test_input_XV_output_15():
assert roman_to_int("XV") == 15
def test_input_V_output_five():
assert roman_to_int("V") == 5
def test_input_I_output_one():
assert roman_to_int("I") == 1
def test_roman_to_int_with_data(test_input, expected):
assert roman_to_int(test_input) == expected