code: def test_make_pager_when_no_pager_found(mocker, monkeypatch):
      assert make_pager(None).__name__ == "plainpager"
  
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 9 for calling a global function with example usage: test_make_pager_when_no_pager_found(mocker, monkeypatch) without return types