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from typing import Union

from fastapi import Depends, FastAPI

from fastapi.testclient import TestClient

app = FastAPI()

async def common_parameters(

q: Union[str, None] = None, skip: int = 0, limit: int = 100

):

return {"q": q, "skip": skip, "limit": limit}

@app.get("/items/")

async def read_items(commons: dict = Depends(common_parameters)):

return {"message": "Hello Items!", "params": commons}

@app.get("/users/")

async def read_users(commons: dict = Depends(common_parameters)):

return {"message": "Hello Users!", "params": commons}

client = TestClient(app)

async def override_dependency(q: Union[str, None] = None):

return {"q": q, "skip": 5, "limit": 10}

app.dependency_overrides[common_parameters] = override_dependency

def test_override_in_items():

response = client.get("/items/")

assert response.status_code == 200

assert response.json() == {

"message": "Hello Items!",

"params": {"q": None, "skip": 5, "limit": 10},

}

def test_override_in_items_with_q():

response = client.get("/items/?q=foo")

assert response.status_code == 200

assert response.json() == {

"message": "Hello Items!",

"params": {"q": "foo", "skip": 5, "limit": 10},

}

def test_override_in_items_with_params():

response = client.get("/items/?q=foo&skip=100&limit=200")

assert response.status_code == 200

assert response.json() == {

"message": "Hello Items!",

"params": {"q": "foo", "skip": 5, "limit": 10},

}