def test_f1_4(self): self.assertEqual(f1(2, 3), 7)
def test_f1_3(self): self.assertEqual(f1(2, 1), 5)
def test_f1_1(self): self.assertEqual(f1(1), 1)
def test_f1_2(self): self.assertEqual(f1(2), 4)
def test_f1(self): self.assertEqual(f1(0), 0)