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Async Mock Contract Mismatch

cluster-20

Async test doubles are wired with the wrong awaitable or context-manager contract (coroutine returned where an async context manager is expected, double-awaiting fetch results, or blocking calls), causing mocks to fail or logic to never run under the event loop.

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Updated6/9/2026

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14 linked nodes

INSTANCE_OFProblem

the mock-test is giving me an error — I have `async with connection.execute(query) as cursor:` block in my endpoint. Tension: the non-mock test is passing, but the mock-test is giving me an error. Outcome: delete the async from `fake_execute` just make it a regular function so it returns your context manager directly.

INSTANCE_OFProblem

I have never tried to use a decorator on an asynchronous function so I am confused — @review_router.get("/review") @admin_required async def get_review():. Tension: if it is going to affect asynchronous tasks. Outcome: Yes, it's Ok to use such decorators.

INSTANCE_OFProblem

<sys>:0: RuntimeWarning: coroutine 'Connection._cancel' was never awaited — Pytest in FastAPI + Postgres. Outcome: To fix this one method is to dispose the engine after every test route.

INSTANCE_OFProblem

facing error that `event loop is closed` — I have been working on yet another API using FastAPI and trying to write test cases for the APIs. Tension: using `asyncpg` driver/library to connect to the main db and for testcases using `aiosqlite` driver/library. Outcome: re-run the tests and report back on if it mitigates the issue.

INSTANCE_OFProblem

The object should be created within an async function or provide loop directly. Outcome: How to properly test my application? It looks like I have to mock kafka-functionality.

INSTANCE_OFProblem

Pytest async tests for a FastAPI app fail with RuntimeError: “Task got Future attached to a different loop” when interacting with the database via SQLAlchemy.

INSTANCE_OFProblem

Mock call count stays zero for patched async method in pytest

INSTANCE_OFProblem

TestClient(app) will not start `async def lifespan(app: FastAPI):`. Tension: the written test fails. Outcome: This is all working fine, every 10 seconds `app.state.global_rw` is increased by one.

INSTANCE_OFProblem

The second — I have this file `default.py` whose handlers I want to be based off root. Tension: The first method works fine when I hit `localhost:5000/`. The second. Outcome: you shouldn't be using the `route` decorator/method.

INSTANCE_OFProblem

got extra junk rows — SQLAlchemy filter on Query again. Outcome: simplify that down using joins and avoids having subqueries.

INSTANCE_OFProblem

the problem is, in fastapi/docs, when I test this endpoint, it returns {}, but the data is commited in database. — I have this function and others similars (with the same problem):. Tension: If I put a print(obj_update) BEFORE return statement, the endpoint returns the data correctly. Outcome: Why is my code being affected by print statement and how can I fix this without need to put print(obj_update)?

INSTANCE_OFProblem

The return type of `asyncConnectAndHandshake` function should be a promise that can be either used in a coroutine with co_await or in a regular function with `operator()`. Tension: This line of code should be executed when promise1 is completed. Outcome: Should I use async_compose?

INSTANCE_OFProblem

Attempting to build an async Django ORM query with `Q()` using `await sync_to_async(Offers.objects.filter)(status=True, Q(...))` raises `SyntaxError: positional argument follows keyword argument`. The query cannot be expressed as keyword args plus `Q()` in that call style.

INSTANCE_OFProblem

async fixtures decorated with @pytest.fixture are no longer auto-detected — Starting with pytest-asyncio 0.23.

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