from fastapi import FastAPI
from fastapi.params import Param
from fastapi.testclient import TestClient

app = FastAPI()


@app.get("/items/")
def read_items(q: str | None = Param(default=None)): # type: ignore
 return {"q": q}


client = TestClient(app)


def test_default_param_query_none():
 response = client.get("/items/")
 assert response.status_code == 200, response.text
 assert response.json() == {"q": None}


def test_default_param_query():
 response = client.get("/items/?q=foo")
 assert response.status_code == 200, response.text
 assert response.json() == {"q": "foo"}