code: def test_terminalwriter_dumb_term_no_markup(
      monkeypatch: MonkeyPatch,
  ) -> None:
      monkeypatch.setattr(os, "environ", {"TERM": "dumb", "PATH": ""})
  
      class MyFile:
          closed = False
  
          def isatty(self):
              return True
  
      with monkeypatch.context() as m:
          m.setattr(sys, "stdout", MyFile())
          assert sys.stdout.isatty()
          tw = terminalwriter.TerminalWriter()
          assert not tw.hasmarkup
  
imports: import io
  import os
  import re
  import shutil
  import sys
  from pathlib import Path
  from typing import Generator
  from typing import Optional
  from unittest import mock
  import pytest
  from _pytest._io import terminalwriter
  from _pytest.monkeypatch import MonkeyPatch
label_desc: Use image node_id 4 for calling a global function with example usage: test_terminalwriter_dumb_term_no_markup(monkeypatch) and returns: True