Could you please make it easier to test without trio?

[mgorny]

I'm working on adding Python 3.13 support to httpx in Gentoo. Unfortunately, trio right now fails tests with Python 3.13 pretty badly, so I'd like to skip it for the time being. Also, we don't really need it, except to run the tests. I can easily work through most of the issues but the direct import trio in tests/concurrency.py is quite a hassle. Would you consider accepting a patch that would move it into the function, e.g.:

diff --git a/tests/concurrency.py b/tests/concurrency.py
index a8ed558..d5ce803 100644
--- a/tests/concurrency.py
+++ b/tests/concurrency.py
@@ -5,11 +5,11 @@ Async environment-agnostic concurrency utilities that are only used in tests.
 import asyncio
 
 import sniffio
-import trio
 
 
 async def sleep(seconds: float) -> None:
     if sniffio.current_async_library() == "trio":
+        import trio
         await trio.sleep(seconds)  # pragma: no cover
     else:
         await asyncio.sleep(seconds)

so that we could simply deselect tests using trio, without getting a top-level failure about the missing package?

[zanieb]

Seems reasonable to me. Is this the only place that would need to change?

[mgorny]

Yes. I would also need to do pytest -o filterwarnings= -k "not trio" but that's not really a problem for us.