[3.14 backport] Fix test_data_file race condition on Python 3.14 free-threaded#12172
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Dreamsorcerer merged 1 commit intoaio-libs:3.14from Feb 28, 2026
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## 3.14 #12172 +/- ##
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Coverage 98.25% 98.26%
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Files 129 129
Lines 45678 45683 +5
Branches 2473 2473
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+ Hits 44881 44890 +9
+ Misses 615 612 -3
+ Partials 182 181 -1
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What do these changes do?
Backport of #12170 to the
3.14release branch.This fixes a flaky test (
test_data_file) that fails on Python 3.14 free-threaded (3.14t) builds.The test asserts
asyncio.isfuture(req._writer)immediately afterawait req.send(conn). On Python 3.12+,asyncio.Taskacceptseager_start=True. Because the 2-byte file payload in the test is tiny, the task may complete synchronously duringsend(), leavingreq._writerasNone.We mock
write_bytesto executeawait asyncio.sleep(0), guaranteeing the task yields before the assertion.Are there changes in behavior for the user?
No user-facing changes. This strictly fixes test flakiness.
Is it a substantial burden for the maintainers to support this?
No. This follows the exact same pattern already used in
test_data_stream.Related issue number
Backport of #12170
Checklist
CHANGES/folder