Time is not freezed when using uvloop event loop

[serozhenka]

Description

freeze_time function doesn't freeze time when using asyncio with uvloop event loop.

uvloop's _time() uses uv_now() which is defined inside libuv here. From what I can see, you don't properly handle such a scenario and don't mock the time there.

Attaching simple script to reproduce:

import asyncio
from datetime import datetime, timezone

import uvloop
from freezegun import freeze_time


async def main():
    ts = datetime.now(timezone.utc)
    loop = asyncio.get_event_loop()
    print(loop.time())
    with freeze_time(ts):
        print(loop.time())


if __name__ == "__main__":
    asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
    asyncio.get_event_loop().run_until_complete(main())

Output:

334815.235
334815.248

Commenting the line with set_event_loop_policy yields the following result , which is the expected behaviour:

159228.968793708
1704377572.259583