class_docstr: Test that we can capture a large amount of log messages with
  accurate timings
code: def join(self, inputs):
      self.log_step = inputs[0].log_step
      self.random_log_prefix = inputs[0].random_log_prefix
  
file_path: metaflow/test/core/tests/large_mflog.py
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 3 for calling the LargeMflogTest obj's underlying member method code with example usage: obj.join(inputs) without return types