code: def test_save_missing(dvc, mocker):
      stage = Stage(dvc)
      dep = Dependency(stage, "path")
      mocker.patch.object(dep.fs, "exists", return_value=False)
      with pytest.raises(dep.DoesNotExistError):
          dep.save()
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_save_missing(dvc, mocker) without return types