text: from fastapi import FastAPI
  from fastapi.testclient import TestClient
  
  swagger_ui_oauth2_redirect_url = "/docs/redirect"
  
  app = FastAPI(swagger_ui_oauth2_redirect_url=swagger_ui_oauth2_redirect_url)
  
  
  @app.get("/items/")
  async def read_items():
      return {"id": "foo"}
  
  
  client = TestClient(app)
  
  
  def test_swagger_ui():
      response = client.get("/docs")
      assert response.status_code == 200, response.text
      assert response.headers["content-type"] == "text/html; charset=utf-8"
      assert "swagger-ui-dist" in response.text
      print(client.base_url)
      assert (
          f"oauth2RedirectUrl: window.location.origin + '{swagger_ui_oauth2_redirect_url}'"
          in response.text
      )
  
  
  def test_swagger_ui_oauth2_redirect():
      response = client.get(swagger_ui_oauth2_redirect_url)
      assert response.status_code == 200, response.text
      assert response.headers["content-type"] == "text/html; charset=utf-8"
      assert "window.opener.swaggerUIRedirectOauth2" in response.text
  
  
  def test_response():
      response = client.get("/items/")
      assert response.json() == {"id": "foo"}
  