def test_one(self): self.assertEqual(staircase_num_ways(1), 1)
def test_five(self): self.assertEqual(staircase_num_ways(5), 13)
def test_three(self): self.assertEqual(staircase_num_ways(3), 4)
def test_four(self): self.assertEqual(staircase_num_ways(4), 7)
def test_two(self): self.assertEqual(staircase_num_ways(2), 2)