code: def test_module_to_path():
      """verify that we can go the other way and turn modules back into expected
      relative paths.
  
      """
      m = {
          # normal modules get nesting.
          "face.cake": "face/cake.py",
          # root-level modules just get a py extension.
          "face": "face.py",
          # This will get treated as a module nested inside of a folder, which is
          # clearly invalid; marking this behavior in the tests.
          "face/cake.py": "face/cake/py.py",
      }
      for k in m:
          assert ufs.module_to_path(k) == m[k]
  
file_path: caliban/tests/caliban/util/test_fs.py
imports: import io
  import json
  import os
  import caliban.util.fs
label_desc: Use image node_id 1 for calling a global function with example usage: test_module_to_path() without return types