text: import pytest
  
  from problems.problem_0415 import Solution
  
  
  @pytest.mark.parametrize('test_input, expected', (
      (('0', '0'), '0'),
      (('123', '456'), '579'),
      (('1', '9'), '10'),
      (('9', '99'), '108')
  ))
  def test_add_strings(test_input, expected):
      assert Solution.addStrings(*test_input) == expected
  