code: def test_param_keys_returns_default_file(tmp_dir, dvc):
      tmp_dir.gen({"params.yaml": "param: 100\n"})
      index = Index.from_repo(dvc)
      assert index.param_keys == {"repo": {("params.yaml",)}}
  
imports: import os
  from itertools import chain
  import pytest
  from pygtrie import Trie
  from dvc.repo.index import Index
  from dvc.stage import Stage
label_desc: Use image node_id 17 for calling a global function with example usage: test_param_keys_returns_default_file(tmp_dir, dvc) without return types