code: def step_all(self):
      pass
  
file_path: metaflow/test/core/tests/basic_unbounded_foreach.py
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps, tag
label_desc: Use image node_id 4 for calling the BasicUnboundedForeachTest obj's underlying member method code with example usage: obj.step_all() without return types