def test_equal_2(self):
     self.assertEqual(print_nums(2), '2')
 def test_equal_4(self):
     self.assertEqual(print_nums(1009, 2), '1009\n0002')
 def test_equal_1(self):
     self.assertEqual(print_nums(), '')
 def test_equal_3(self):
     self.assertEqual(print_nums(1, 12, 34), '01\n12\n34')