def test_factorial_two():
actual = factorial(2)
expected = 2
assert actual == expected
def test_factorial_one():
actual = factorial(1)
expected = 1
assert actual == expected
def test_factorial_4():
actual = factorial(4)
expected = 24
assert actual == expected
def test_factorial_5():
actual = factorial(5)
expected = 120
assert actual == expected
def test_factorial_3():
actual = factorial(3)
expected = 6
assert actual == expected