def test_fizz(): assert fb(3) == 'fizz'
def test_buzz(): assert fb(5) == 'buzz'
def test_default(): assert fb(7) == 7
def test_fizzbuzz_multi(): assert fb(30) == 'fizzbuzz'
def test_buzz_multi(): assert fb(10) == 'buzz'
def test_fizz_multi(): assert fb(6) == 'fizz'
def test_fizzbuzz(): assert fb(15) == 'fizzbuzz'