Tests trying to find unused ports are flakey when automated

• uvloop version: 0.17.0
• Python version: 3.10
• Platform: nix/darwin
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: N/A
• Does uvloop behave differently from vanilla asyncio? How?: N/A

The tests using find_free_port (like https://github.com/MagicStack/uvloop/blob/d2deffefa18653636eb03ea77a5dab6e4febf6c6/tests/test_tcp.py#L252) may fail in busy CI environments. For example building for nixpkgs involves running tests every time. It ends up with: (https://hydra.nixos.org/build/197525892/nixlog/1)

=================================== FAILURES ===================================
_______________________ Test_UV_TCP.test_create_server_5 _______________________
Traceback (most recent call last):
  File "/private/tmp/tmp.xkcj6kx4o4/tests/test_tcp.py", line 245, in test_create_server_5
    self.loop.run_until_complete(runner())
  File "uvloop/loop.pyx", line 1517, in uvloop.loop.Loop.run_until_complete
  File "/private/tmp/tmp.xkcj6kx4o4/tests/test_tcp.py", line 238, in runner
    srv = await self.loop.create_server(
  File "uvloop/loop.pyx", line 1790, in create_server
OSError: [Errno 48] error while attempting to bind on address ('::', 50000, 0, 0): address already in use
_______________________ Test_UV_TCP.test_create_server_6 _______________________
Traceback (most recent call last):
  File "/private/tmp/tmp.xkcj6kx4o4/tests/test_tcp.py", line 271, in test_create_server_6
    self.loop.run_until_complete(runner())
  File "uvloop/loop.pyx", line 1517, in uvloop.loop.Loop.run_until_complete
  File "/private/tmp/tmp.xkcj6kx4o4/tests/test_tcp.py", line 255, in runner
    srv1 = await self.loop.create_server(
  File "uvloop/loop.pyx", line 1790, in create_server
OSError: [Errno 48] error while attempting to bind on address ('::', 50000, 0, 0): address already in use
=============================== warnings summary ===============================

Do those tests need to use a common ipv4/6 socket? Could they use only one protocol at a time with port 0 and then get the local port number from the result?

Or maybe build the retry loop around the first socket creation rather than 2 independent steps?

tests/test_tcp.py から始め、特に test_create_server_5 と test_create_server_6 周辺で find_free_port を使用しているテストを確認してください。自動化された環境または負荷の高い環境で失敗を再現し、その後、ポート 0、共有 IPv4/IPv6 ソケット、または最初のソケット作成の再試行を使用する方法を評価してください。選択されたポートがすでに使用中であることが原因でテストが失敗しなくなれば完了です。