code: def test_downstream(dvc, mocker):
      cmd = CmdRepro(parse_args(["repro", "--downstream"]))
      mocker.patch.object(cmd.repo, "reproduce")
      cmd.run()
      arguments = common_arguments.copy()
      arguments.update(repro_arguments)
      arguments.update({"downstream": True})
      cmd.repo.reproduce.assert_called_with(**arguments)
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_downstream(dvc, mocker) without return types