from dirty_equals import IsPartialDict from fastapi import Cookie, FastAPI, Header, Query from fastapi._compat import PYDANTIC_V2 from fastapi.testclient import TestClient from pydantic import BaseModel, Field app = FastAPI() class Model(BaseModel): param: str = Field(alias="param_alias") @app.get("/query") async def query_model(data: Model = Query()): return {"param": data.param} @app.get("/header") async def header_model(data: Model = Header()): return {"param": data.param} @app.get("/cookie") async def cookie_model(data: Model = Cookie()): return {"param": data.param} def test_query_model_with_alias(): client = TestClient(app) response = client.get("/query", params={"param_alias": "value"}) assert response.status_code == 200, response.text assert response.json() == {"param": "value"} def test_header_model_with_alias(): client = TestClient(app) response = client.get("/header", headers={"param_alias": "value"}) assert response.status_code == 200, response.text assert response.json() == {"param": "value"} def test_cookie_model_with_alias(): client = TestClient(app) client.cookies.set("param_alias", "value") response = client.get("/cookie") assert response.status_code == 200, response.text assert response.json() == {"param": "value"} def test_query_model_with_alias_by_name(): client = TestClient(app) response = client.get("/query", params={"param": "value"}) assert response.status_code == 422, response.text details = response.json() if PYDANTIC_V2: assert details["detail"][0]["input"] == {"param": "value"} def test_header_model_with_alias_by_name(): client = TestClient(app) response = client.get("/header", headers={"param": "value"}) assert response.status_code == 422, response.text details = response.json() if PYDANTIC_V2: assert details["detail"][0]["input"] == IsPartialDict({"param": "value"}) def test_cookie_model_with_alias_by_name(): client = TestClient(app) client.cookies.set("param", "value") response = client.get("/cookie") assert response.status_code == 422, response.text details = response.json() if PYDANTIC_V2: assert details["detail"][0]["input"] == {"param": "value"}