code: def unknown_platform(monkeypatch, name="nonplatform"):
      monkeypatch.setattr("graphviz.backend.viewing.PLATFORM", name)
      yield name
  
file_path: graphviz/tests/conftest.py
imports: import pytest
label_desc: Use image node_id 13 for calling a global function with example usage: unknown_platform(monkeypatch, name) without return types