多个异步单元测试失败，但逐个运行它们将通过

问题描述

我有两个单元测试，如果逐个运行它们，它们就会通过。如果我在类级别运行它们，则在response = await ac.post(处一次传递失败，另一次失败，并显示错误消息：RuntimeError: Event loop is closed

@pytest.mark.asyncio
async def test_successful_register_saves_expiry_to_seven_days(self):
    async with AsyncClient(app=app, base_url="http://127.0.0.1") as ac:
        response = await ac.post(
            "/register/",
            headers={},
            json={
                "device_id": "u1",
                "device_type": DeviceType.IPHONE.value,
            },
        )
        query = device.select(whereclause=device.c.id == "u1")
        d = await db.fetch_one(query)
        assert d.expires_at == datetime.utcnow().replace(
            second=0, microsecond=0
        ) + timedelta(days=7)

@pytest.mark.asyncio
async def test_successful_register_saves_device_type(self):
    async with AsyncClient(app=app, base_url="http://127.0.0.1") as ac:
        response = await ac.post(
            "/register/",
            headers={},
            json={
                "device_id": "u1",
                "device_type": DeviceType.ANDROID.value,
            },
        )
        query = device.select(whereclause=device.c.id == "u1")
        d = await db.fetch_one(query)
        assert d.type == DeviceType.ANDROID.value

我已经尝试了几个小时，请问我错过了什么？

---

解决方案

我已找到解决方案。

在tests下创建名为conftest.py的文件

并插入以下内容：

@pytest.yield_fixture(scope="session")
def event_loop(request):
    """Create an instance of the default event loop for each test case."""
    loop = asyncio.get_event_loop_policy().new_event_loop()
    yield loop
    loop.close()

这将在每次测试后正确结束循环，并允许运行多个循环。