code: def testImporterDumpsJsonRoundtrip(self):
      component_id = "my_importer"
      source_uris = ["m/y/u/r/i"]
      impt = importer.Importer(
          source_uri=source_uris,
          artifact_type=standard_artifacts.Examples,
      ).with_id(component_id)
  
      # The following line will raise an assertion if object not JSONable.
      json_text = json_utils.dumps(impt)
  
      actual_obj = json_utils.loads(json_text)
      self.assertEqual(actual_obj.id, component_id)
      self.assertEqual(actual_obj._source_uri, source_uris)
  
imports: from absl.testing import parameterized
  import tensorflow
  from tfx import types
  from tfx.dsl.components.common import importer
  from tfx.orchestration import data_types
  from tfx.orchestration import data_types_utils
  from tfx.orchestration import metadata
  from tfx.types import artifact_utils
  from tfx.types import standard_artifacts
  from tfx.utils import json_utils
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 6 for calling the ImporterTest obj's underlying member method code with example usage: obj.testImporterDumpsJsonRoundtrip() without return types