import pytest from fastapi import Depends, FastAPI from fastapi.testclient import TestClient app = FastAPI() class CallableDependency: def __call__(self, value: str) -> str: return value class AsyncCallableDependency: async def __call__(self, value: str) -> str: return value class MethodsDependency: def synchronous(self, value: str) -> str: return value async def asynchronous(self, value: str) -> str: return value callable_dependency = CallableDependency() async_callable_dependency = AsyncCallableDependency() methods_dependency = MethodsDependency() @app.get("/callable-dependency") async def get_callable_dependency(value: str = Depends(callable_dependency)): return value @app.get("/async-callable-dependency") async def get_callable_dependency(value: str = Depends(async_callable_dependency)): return value @app.get("/synchronous-method-dependency") async def get_synchronous_method_dependency( value: str = Depends(methods_dependency.synchronous), ): return value @app.get("/asynchronous-method-dependency") async def get_asynchronous_method_dependency( value: str = Depends(methods_dependency.asynchronous), ): return value client = TestClient(app) @pytest.mark.parametrize( "route,value", [ ("/callable-dependency", "callable-dependency"), ("/async-callable-dependency", "async-callable-dependency"), ("/synchronous-method-dependency", "synchronous-method-dependency"), ("/asynchronous-method-dependency", "asynchronous-method-dependency"), ], ) def test_class_dependency(route, value): response = client.get(route, params={"value": value}) assert response.status_code == 200, response.text assert response.json() == value