code: def testDirectConnection(self):
      # Tests a direct dict to dict connection in the DAG.
  
      class UnitQ(pipeline.Pipeline):
          def __init__(self):
              pipeline.Pipeline.__init__(
                  self, Type0, {"xy": Type1, "z": Type2}
              )
  
          def transform(self, input_object):
              return {
                  "xy": [Type1(x=input_object.x, y=input_object.y)],
                  "z": [Type2(z=input_object.z)],
              }
  
      class UnitR(pipeline.Pipeline):
          def __init__(self):
              pipeline.Pipeline.__init__(
                  self, {"xy": Type1, "z": Type2}, Type4
              )
  
          def transform(self, input_object):
              input_dict = input_object
              return [
                  Type4(
                      input_dict["xy"].x,
                      input_dict["xy"].y,
                      input_dict["z"].z,
                  )
              ]
  
      q, r = UnitQ(), UnitR()
      dag = {
          q: dag_pipeline.DagInput(q.input_type),
          r: q,
          dag_pipeline.DagOutput("output"): r,
      }
  
      dag_pipe_obj = dag_pipeline.DAGPipeline(dag)
      x, y, z = -3, 0, 8
      output_dict = dag_pipe_obj.transform(Type0(x, y, z))
  
      self.assertEqual(output_dict, {"output": [Type4(x, y, z)]})
  
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 6 for calling the DAGPipelineTest obj's underlying member method code with example usage: obj.testDirectConnection() and returns: dict, list