code: def test_get_key(tmp_dir, dvc, path, key):
      fs = DataFileSystem(index=dvc.index.data["repo"])
      assert fs.fs._get_key(path) == key
  
imports: import posixpath
  import shutil
  import pytest
  import dvc_data
  from dvc.fs import localfs
  from dvc.fs.data import DataFileSystem
  from dvc.utils.fs import remove
  from dvc_data.hashfile.build import build
  from dvc_data.hashfile.hash_info import HashInfo
label_desc: Use image node_id 1 for calling a global function with example usage: test_get_key(tmp_dir, dvc, path, key) without return types