def test_factorial_1(self): self.assertEqual(factorial(1), 1)
def test_factorial_4(self): self.assertEqual(factorial(4), 24)
def test_factorial_0(self): self.assertEqual(factorial(0), 1)
def test_factorial_2(self): self.assertEqual(factorial(2), 2)
def test_factorial_3(self): self.assertEqual(factorial(3), 6)