code: def expected_path(self):
      return self.path / "expected"
  
file_path: snakemake/snakemake/unit_tests/__init__.py
imports: from itertools import groupby
  from pathlib import Path
  import shutil
  import os
  from snakemake.common import async_run
  from snakemake.logging import logger
  from snakemake import __version__
  from snakemake.exceptions import WorkflowError
label_desc: Use image node_id 4 for calling the RuleTest obj's underlying member method code with example usage: obj.expected_path() and returns: unknown