def test_romanConverter_negative():
assert romanConverter(-4) == "Error, negative number"
def test_romanConverter_4():
assert romanConverter(4) == "IV"
def test_romanConverter_decimal():
assert romanConverter("2.2") == "Error, input is not integer"
def test_romanConverter_0():
assert romanConverter(0) == "Error, no zero conversion"
def test_romanConverter_2020():
assert romanConverter(2020) == "MMXX"
def test_romanConverter_letter():
assert romanConverter("4a0") == "Error, input is not integer"
def test_romanConverter_900():
assert romanConverter(900) == "CM"
def test_romanConverter_1000():
assert romanConverter(1000) == "M"
def test_romanConverter_1():
assert romanConverter(1) == "I"
def test_romanConverter_500():
assert romanConverter(500) == "D"
def test_romanConverter_400():
assert romanConverter(400) == "CD"
def test_romanConverter_90():
assert romanConverter(90) == "XC"
def test_romanConverter_40():
assert romanConverter(40) == "XL"
def test_romanConverter_10():
assert romanConverter(10) == "X"
def test_romanConverter_5():
assert romanConverter(5) == "V"
