def test_cookie_param_model(client: TestClient):
    with client as c:
        c.cookies.set("session_id", "123")
        c.cookies.set("fatebook_tracker", "456")
        c.cookies.set("googall_tracker", "789")
        response = c.get("/items/")
    assert response.status_code == 200
    assert response.json() == {
        "session_id": "123",
        "fatebook_tracker": "456",
        "googall_tracker": "789",
    }

def test_cookie_param_model(client: TestClient):
    with client as c:
        c.cookies.set("session_id", "123")
        c.cookies.set("fatebook_tracker", "456")
        c.cookies.set("googall_tracker", "789")
        response = c.get("/items/")
    assert response.status_code == 200
    assert response.json() == {
        "session_id": "123",
        "fatebook_tracker": "456",
        "googall_tracker": "789",
    }

```python
from typing import Annotated

from fastapi import Cookie, FastAPI
from pydantic import BaseModel

app = FastAPI()


class Cookies(BaseModel):
    session_id: str
    fatebook_tracker: str | None = None
    googall_tracker: str | None = None


@app.get("/items/")
async def read_items(cookies: Annotated[Cookies, Cookie()]):
    return cookies
```