class_docstr: Test that we can capture a large amount of log messages with
  accurate timings
code: def step_all(self):
      pass
  
file_path: metaflow/test/core/tests/large_mflog.py
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 4 for calling the LargeMflogTest obj's underlying member method code with example usage: obj.step_all() without return types