code: def test_always_changed(dvc):
      stage = Stage(dvc, "path", always_changed=True)
      stage.save()
      with dvc.lock:
          assert stage.changed()
          assert stage.status()["path"] == ["always changed"]
  
file_path: dvc/tests/unit/stage/test_stage.py
imports: import os
  import signal
  import subprocess
  import threading
  import pytest
  from dvc.dependency.repo import RepoDependency
  from dvc.stage import Stage
  from dvc.stage.exceptions import StageUpdateError
label_desc: Use image node_id 8 for calling a global function with example usage: test_always_changed(dvc) without return types