def test_zero(self): assert (liczby.num2text(0) == 'zero')
def test_default(self): assert (liczby.num2text(4) == None)
def test_answer_type(self): assert isinstance(liczby.num2text(1), str)
def test_four(self): assert (liczby.num2text(3) == 'cztery')
def test_three(self): assert (liczby.num2text(3) == 'trzy')
def test_two(self): assert (liczby.num2text(2) == 'dwa')
def test_one(self): assert (liczby.num2text(1) == 'jeden')
def test_two(self): assert liczby.num2text(2) == 'jeden'