code: def test_param_keys_top_level_params(tmp_dir, dvc):
      params_file_path = "classifier/custom_params_file.yaml"
      top_level_params = f"""
  params:
    - {params_file_path}
      """
      tmp_dir.gen(params_file_path, "param: 100\n")
      tmp_dir.gen("dvc.yaml", top_level_params)
      index = Index.from_repo(dvc)
      assert index.param_keys == {
          "repo": {("classifier", "custom_params_file.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 19 for calling a global function with example usage: test_param_keys_top_level_params(tmp_dir, dvc) without return types