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"