code: def testDuplicateNameError(self):
      class UnitQ(pipeline.Pipeline):
          def __init__(self, name="UnitQ"):
              pipeline.Pipeline.__init__(self, Type0, Type1, name)
  
          def transform(self, input_object):
              pass
  
      q, q2 = UnitQ(), UnitQ()
      dag = {
          q: dag_pipeline.DagInput(Type0),
          q2: dag_pipeline.DagInput(Type0),
          dag_pipeline.DagOutput(): {"q": q, "q2": q2},
      }
      with self.assertRaises(dag_pipeline.DuplicateNameError):
          dag_pipeline.DAGPipeline(dag)
  
imports: import collections
  from absl.testing import absltest
  from magenta.pipelines import dag_pipeline
  from magenta.pipelines import pipeline
  from magenta.pipelines import statistics
label_desc: Use image node_id 16 for calling the DAGPipelineTest obj's underlying member method code with example usage: obj.testDuplicateNameError() without return types