I run my python tests with pytest and it shows a warning:
RuntimeWarning: coroutine 'AsyncMockMixin._execute_mock_call' was never awaited
In the first glance I didn't see problems with my code. All coroutines were awaited as far as I can see. But obviously there is some problem in tests.
How my test looks like. I deleted some info to hide business logic.
@pytest.mark.asyncio()
async def test1(
client: httpx.AsyncClient,
mock1: MagicMock, ...
) -> None:
...
await client.post(url="url", json=jsonable_encoder(body.dict(), by_alias=True))
mock1.func.assert_awaited_once_with(...)
As docs recommends, I've enabled tracemalloc. But it only shows this info:
.../lib/python3.11/site-packages/fastapi/routing.py:144: RuntimeWarning: coroutine 'AsyncMockMixin._execute_mock_call' was never awaited
value, errors_ = field.validate(response_content, {}, loc=("response",))
Object allocated at:
File ".../lib/python3.11/site-packages/pluggy/_callers.py", line 77
res = hook_impl.function(*args)
File ".../lib/python3.11/site-packages/_pytest/runner.py", line 169
item.runtest()
File ".../lib/python3.11/site-packages/_pytest/python.py", line 1792
self.ihook.pytest_pyfunc_call(pyfuncitem=self)
File ".../lib/python3.11/site-packages/pluggy/_hooks.py", line 493
return self._hookexec(self.name, self._hookimpls, kwargs, firstresult)
File ".../lib/python3.11/site-packages/pluggy/_manager.py", line 115
return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
File ".../lib/python3.11/site-packages/pluggy/_callers.py", line 77
res = hook_impl.function(*args)
File ".../lib/python3.11/site-packages/_pytest/python.py", line 194
result = testfunction(**testargs)
File ".../lib/python3.11/site-packages/pytest_asyncio/plugin.py", line 532
_loop.run_until_complete(task)
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/asyncio/base_events.py", line 640
self.run_forever()
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/asyncio/base_events.py", line 607
self._run_once()
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/asyncio/base_events.py", line 1922
handle._run()
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/asyncio/events.py", line 80
self._context.run(self._callback, *self._args)
File ".../lib/python3.11/site-packages/starlette/middleware/base.py", line 70
await self.app(scope, receive_or_disconnect, send_no_error)
File ".../lib/python3.11/site-packages/starlette/middleware/exceptions.py", line 68
await self.app(scope, receive, sender)
File ".../lib/python3.11/site-packages/fastapi/middleware/asyncexitstack.py", line 17
await self.app(scope, receive, send)
File ".../python3.11/site-packages/starlette/routing.py", line 718
await route.handle(scope, receive, send)
File ".../lib/python3.11/site-packages/starlette/routing.py", line 276
await self.app(scope, receive, send)
File ".../lib/python3.11/site-packages/starlette/routing.py", line 66
response = await func(request)
File ".../lib/python3.11/site-packages/fastapi/routing.py", line 291
content = await serialize_response(
File ".../lib/python3.11/site-packages/fastapi/routing.py", line 144
value, errors_ = field.validate(response_content, {}, loc=("response",))
But it's fastapi package. I don't think, that the problem is there
What my possible next steps to catch where exactly not awaited coroutine created in my code? Please, recommend some tools or commands.
Turned out that this warning was appearing because result of function client.post was never assigned to any variable.
So I changed my test to
@pytest.mark.asyncio()
async def test1(
client: httpx.AsyncClient,
mock1: MagicMock, ...
) -> None:
...
resp = await client.post(url="url", json=jsonable_encoder(body.dict(), by_alias=True))
assert resp.status_code == 200
mock1.func.assert_awaited_once_with(...)
And warning was gone.