class_docstr: Test that we can capture a large amount of log messages with
  accurate timings
code: def inner(self):
      ISOFORMAT = "%Y-%m-%dT%H:%M:%S.%f"
      from datetime import datetime
      from metaflow import current
      import sys
  
      self.log_step = current.step_name
      task_id = current.task_id
      for i in range(NUM_LINES):
          now = datetime.utcnow().strftime(ISOFORMAT)
          print(
              "%s %s stdout %d %s"
              % (self.random_log_prefix, task_id, i, now)
          )
          sys.stderr.write(
              "%s %s stderr %d %s\n"
              % (self.random_log_prefix, task_id, i, now)
          )
  
file_path: metaflow/test/core/tests/large_mflog.py
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 2 for calling the LargeMflogTest obj's underlying member method code with example usage: obj.inner() without return types