code: def test_repr():
      class DummyStep(Step):
          def somefunc(self, X):
              pass
  
      step = DummyStep(name="some-step")
      data_placeholder = DataPlaceholder(step, 1, "some-step:1/0")
      expected_repr = "DataPlaceholder(step=DummyStep(name='some-step', n_outputs=1), port=1, name='some-step:1/0')"
      assert repr(data_placeholder) == expected_repr
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_repr() without return types