pytest RuntimeError: Event loop is closed FastApi

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I receive an error RuntimeError: Event loop is closed each time when i try to make more than one async call function inside my test. I already tried to use all suggestions on stackoverflow to rewrite event_loop fixture but nothing works. I wonder what i'm missing

Run test command: python -m pytest tests/ --asyncio-mode=auto

requirements.txt

pytest==7.1.2
pytest-asyncio==0.18.3
pytest-html==3.1.1
pytest-metadata==2.0.1

test.py

async def test_user(test_client_fast_api):
    assert 200 == 200


    request_first = test_client_fast_api.post( # works fine
        "/first_route",

    )

    request_second = test_client_fast_api.post( # recieve RuntimeError: Event loop is closed
        "/second_route",
    )

conftest.py

@pytest.fixture()
def event_loop():
    try:
        loop = asyncio.get_running_loop()
    except RuntimeError:
        loop = asyncio.new_event_loop()
    yield loop
    loop.close()
pytest
1 Answers

It took me all afternoon to solve this problem. I also try to succeed from other people's code, here is my code.

Add a file conftest.py to the directory where the test script is placed. And write the following code.

import pytest
from main import app
from httpx import AsyncClient


@pytest.fixture(scope="session")
def anyio_backend():
    return "asyncio"


@pytest.fixture(scope="session")
async def client():
    async with AsyncClient(app=app, base_url="http://test") as client:
        print("Client is ready")
        yield client

And then write a test script test_xxx.py.

import pytest
from httpx import AsyncClient


@pytest.mark.anyio
async def test_run_not_exists_schedule(client: AsyncClient):
    response = await client.get("/schedule/list")
    assert response.status_code == 200
    schedules = response.json()["data"]["schedules"]
    schedules_exists = [i["id"] for i in schedules]
    not_exists_id = max(schedules_exists) + 1
    request_body = {"id": not_exists_id}
    response = await client.put("/schedule/run_cycle", data=request_body)
    assert response.status_code != 200


@pytest.mark.anyio
async def test_run_adfasdfw(client: AsyncClient):
    response = await client.get("/schedule/list")
    assert response.status_code == 200
    schedules = response.json()["data"]["schedules"]
    schedules_exists = [i["id"] for i in schedules]
    not_exists_id = max(schedules_exists) + 1
    request_body = {"id": not_exists_id}
    response = await client.put("/schedule/run_cycle", data=request_body)
    assert response.status_code != 200

This is the real test code for my own project. You can change it to your own.Finally, run in the project's terminal python -m pytest.If all goes well, it should be ok's.This may involve libraries that need to be installed.

pytest
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