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import pytest
from fastapi import APIRouter, FastAPI
from fastapi.exceptions import FastAPIError
from fastapi.staticfiles import StaticFiles
from fastapi.testclient import TestClient
def test_mount_static_files_to_apirouter(tmp_path):
static_asset = tmp_path / "index.html"
static_asset.write_text("Hello, World!")
router = APIRouter()
router.mount("/static", StaticFiles(directory=tmp_path), name="static")
app = FastAPI()
app.include_router(router)
client = TestClient(app)
response = client.get("/static/index.html")
assert response.status_code == 200
assert response.text == "Hello, World!"
def test_mount_app_to_apirouter_raises():
router = APIRouter()
sub_app = FastAPI()
with pytest.raises(
FastAPIError,
match="APIRouter does not support mounting ASGI applications other than StaticFiles.",
):
router.mount("/sub", sub_app)