content: import pytest
  
  from zenml import pipeline, step
  from zenml.pipelines.pipeline_definition import Pipeline
  
  
  @step
  def empty_step() -> None:
      return None
  
  
  @pipeline
  def _empty_pipeline() -> None:
      empty_step()
  
  
  @pytest.fixture
  def empty_pipeline() -> Pipeline:
      return _empty_pipeline.copy()
  