aioloop-proxy
A proxy for asyncio.AbstractEventLoop for testing purposes.
When tests writing for asyncio based code, there are controversial requirements.
First, a signle event loop for the whole test session (or test subset) is desired. For example, if web server starts slowly, there is a temptation to create a server only once and access to the single web server instance from each test.
Second, each test should be isolated. It means that asyncio tasks (timers, connections, etc.) created by test A should be finished at test A finalization and should not affect test B execution.
The library provides loop proxy class that fully implements asyncio.AbstractEventLoop interface but redirects all actual work to the proxied parent loop. It allows to check that all activities created with the proxy are finished on the proxy finalization. In turn, all tasks created with the parent loop are still keep working during the proxy execution.
Loop proxies can be nested, e.g. global-loop -> module-loop -> test-loop is supported.
The library is test tool agnostic, e.g. it can be integrated with unittest and pytest easily (the actual integraion is out of the project scope).
Installation:
pip install aioloop-proxy
The usage is:
import asyncio import aioloop_proxy loop = asyncio.new_event_loop() ... with aioloop_proxy(loop, strict=True) as loop_proxy: loop_proxy.run_until_complete(test_func())
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