code: def testTypeMismatchError(self):
      class UnitQ(pipeline.Pipeline):
          def __init__(self):
              pipeline.Pipeline.__init__(self, Type0, Type1)
  
          def transform(self, input_object):
              pass
  
      class UnitR(pipeline.Pipeline):
          def __init__(self):
              pipeline.Pipeline.__init__(
                  self, Type1, {"a": Type2, "b": Type3}
              )
  
          def transform(self, input_object):
              pass
  
      class UnitS(pipeline.Pipeline):
          def __init__(self):
              pipeline.Pipeline.__init__(
                  self, {"x": Type2, "y": Type3}, Type4
              )
  
          def transform(self, input_object):
              pass
  
      class UnitT(pipeline.Pipeline):
          def __init__(self):
              pipeline.Pipeline.__init__(
                  self, {"x": Type2, "y": Type5}, Type4
              )
  
          def transform(self, input_object):
              pass
  
      q, r, s, t = UnitQ(), UnitR(), UnitS(), UnitT()
      dag = {
          q: dag_pipeline.DagInput(Type1),
          r: q,
          s: r,
          dag_pipeline.DagOutput("output"): s,
      }
      with self.assertRaises(dag_pipeline.TypeMismatchError):
          dag_pipeline.DAGPipeline(dag)
  
      q2 = UnitQ()
      dag = {
          q: dag_pipeline.DagInput(Type0),
          q2: q,
          dag_pipeline.DagOutput("output"): q2,
      }
      with self.assertRaises(dag_pipeline.TypeMismatchError):
          dag_pipeline.DAGPipeline(dag)
  
      dag = {
          q: dag_pipeline.DagInput(Type0),
          r: q,
          s: {"x": r["b"], "y": r["a"]},
          dag_pipeline.DagOutput("output"): s,
      }
      with self.assertRaises(dag_pipeline.TypeMismatchError):
          dag_pipeline.DAGPipeline(dag)
  
      dag = {
          q: dag_pipeline.DagInput(Type0),
          r: q,
          t: r,
          dag_pipeline.DagOutput("output"): t,
      }
      with self.assertRaises(dag_pipeline.TypeMismatchError):
          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 12 for calling the DAGPipelineTest obj's underlying member method code with example usage: obj.testTypeMismatchError() without return types