code: def test_get(tmp_path: Path):
      file_path: Path = tmp_path / "large-video-file.mp4"
      tutorial009.some_file_path = str(file_path)
      test_content = b"Fake video bytes"
      file_path.write_bytes(test_content)
      response = client.get("/")
      assert response.content == test_content
  
imports: from pathlib import Path
  from fastapi.testclient import TestClient
  from docs_src.custom_response import tutorial009
  from docs_src.custom_response.tutorial009 import app
label_desc: Use image node_id 1 for calling a global function with example usage: test_get(tmp_path) without return types