code: def test_update_before_and_after_dvc_init(tmp_dir, dvc, git_dir):
      with git_dir.chdir():
          git_dir.scm_gen(
              "file", "first version", commit="first version"
          )
          old_rev = git_dir.scm.get_rev()
  
      stage = dvc.imp(os.fspath(git_dir), "file", "file")
  
      with git_dir.chdir():
          git_dir.init(dvc=True)
          git_dir.scm.gitpython.repo.index.remove(["file"])
          os.remove("file")
          git_dir.dvc_gen("file", "second version", commit="with dvc")
          new_rev = git_dir.scm.get_rev()
  
      assert old_rev != new_rev
  
      assert dvc.status([stage.path]) == {
          "file.dvc": [
              {
                  "changed deps": {
                      f"file ({os.fspath(git_dir)})": "update available"
                  }
              }
          ]
      }
  
      dvc.update([stage.path])
  
      assert (tmp_dir / "file").read_text() == "second version"
      assert dvc.status([stage.path]) == {}
  
imports: import os
  import pytest
  from dvc.dependency import base
  from dvc.dvcfile import load_file
  from dvc.exceptions import InvalidArgumentError
  from dvc.testing.tmp_dir import make_subrepo
label_desc: Use image node_id 3 for calling a global function with example usage: test_update_before_and_after_dvc_init(tmp_dir, dvc, git_dir) without return types