code: def clear_envs(monkeypatch):
      monkeypatch.delenv(DVC_PAGER, raising=False)
      monkeypatch.delenv(PAGER_ENV, raising=False)
      monkeypatch.delenv(LESS, raising=False)
  
file_path: dvc/tests/unit/ui/test_pager.py
imports: import pytest
  from dvc.env import DVC_PAGER
  from dvc.ui.pager import DEFAULT_PAGER, LESS, PAGER_ENV, find_pager, make_pager, pager
label_desc: Use image node_id 1 for calling a global function with example usage: clear_envs(monkeypatch) without return types