text: import pytest
  
  from catalyst.dl import __main__ as main
  
  
  def test_arg_parser_run():
      """@TODO: Docs. Contribution is welcome."""
      parser = main.build_parser()
  
      args, uargs = parser.parse_known_args(
          ["run", "--config", "test.yml", "--unknown"]
      )
  
      assert args.command == "run"
      assert args.configs == ["test.yml"]
      assert "--unknown" in uargs
  
  
  def test_run_multiple_configs():
      """@TODO: Docs. Contribution is welcome."""
      parser = main.build_parser()
  
      args, uargs = parser.parse_known_args(
          ["run", "--config", "test.yml", "test1.yml"]
      )
  
      assert args.configs == ["test.yml", "test1.yml"]
  
  
  def test_arg_parser_fail_on_none():
      """@TODO: Docs. Contribution is welcome."""
      parser = main.build_parser()
  
      with pytest.raises(SystemExit):
          # Raises SystemExit when args are not ok
          parser.parse_known_args(["--config", "test.yml", "--unknown"])
  