failure with uvloop and @fail_on

[janhn]

While testing with uvloop, the @fail_on decorator seems to rely on the internals of the default asyncio loop:

import asyncio
import asynctest
import uvloop

# make calls to asyncio.get_event_loop() return an instance of uvloop
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())


@asynctest.fail_on(active_handles=True)
class TestFailOn(asynctest.TestCase):
    """
    This raises in asynctest with:
        AttributeError: 'Loop' object has no attribute '_scheduled'
    at .../asynctest/_fail_on.py:88
    """

    use_default_loop = True

    async def test_async_task(self):
        await asyncio.sleep(0)

[Martiusweb]

Yes, the public API of asyncio doesn't expose enough methods to implement these features.

Unfortunately, fixing this is complicated and I've no plans yet.