code: def test_scheduler_not_found(self):
      task = test_utils.create_exec_node_task(
          node_uid=task_lib.NodeUid(
              pipeline_uid=task_lib.PipelineUid(pipeline_id="pipeline"),
              node_id="Transform",
          ),
          pipeline=self._pipeline,
      )
      with self.assertRaisesRegex(
          ValueError, "No task scheduler class or builder found"
      ):
          ts.TaskSchedulerRegistry.create_task_scheduler(
              mock.Mock(), self._pipeline, task
          )
  
imports: from absl.testing.absltest import mock
  import tensorflow
  from tfx.orchestration import metadata
  from tfx.orchestration.experimental.core import constants
  from tfx.orchestration.experimental.core import task
  from tfx.orchestration.experimental.core import task_scheduler
  from tfx.orchestration.experimental.core import test_utils
  from tfx.proto.orchestration import execution_result_pb2
  from tfx.proto.orchestration import pipeline_pb2
  from tfx.utils import test_case_utils
label_desc: Use image node_id 5 for calling the TaskSchedulerRegistryTest obj's underlying member method code with example usage: obj.test_scheduler_not_found() without return types