[vdusek]

Two tests added in #2349 fail intermittently in CI (seen on #2371).

• test_closing_unread_response_reuses_connection[impit]: impit returns a drained connection to its pool in the background, so the request sent right after a close sometimes opens a second connection. Under load this failed in 2 of 120 local runs. The test now allows up to two connections. A working client opens 1 or 2, and one that drops the connections of closed responses always opens 3 (300 runs each), so the test still catches that regression.
• test_read_again_after_timeout[httpx]: the 200 ms timeout covered the whole request, and the slow macOS runner didn't get the headers in time. The test now uses a 10 s timeout and moves the event loop clock past the deadline before the second read(), so it doesn't wait on the wall clock.

Both tests still fail when the behavior they cover is broken. After the change, 1,440 runs under load passed.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@          Coverage Diff          @@
##             v2    #2373   +/-   ##
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  Coverage      ?   94.29%           
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  Files         ?      187           
  Lines         ?    13838           
  Branches      ?        0           
=====================================
  Hits          ?    13048           
  Misses        ?      790           
  Partials      ?        0           

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