fix(tests): stop test_merge_attribution flaking on a sha substring (tsk-oqpbvn) - #2811
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…sha substring
Two assertions checked that the excluded PR's number ("41") was a bare
substring of the checker's stdout, but the fixture commit shas in this file
are generated at runtime by real git commits. When the in-scope PR's own
sha happened to contain "41" as a hex-digit coincidence, the assertion
failed for a reason with nothing to do with the reconciliation logic under
test -- CI hit this three times in one hour on unrelated PRs (#2798 shard
3.12/3, #2800 shard 3.13/3).
Both now assert on the exact "#41"/"#42" PR-reference token the checker
prints (f"#{pr_num} {short}"), which cannot collide with a hex sha
substring the way a bare number can. Added a deterministic regression test
that fixes the collision directly rather than depending on a real sha
happening to reproduce it, so the fix itself isn't probabilistic either.
Swept tests/ for the same class (`assert "[0-9]+" not in result.stdout`
against output containing a runtime-generated sha); these were the only two
hits.
Docs-Reviewed: tests-only change, no code/route/doc surface touched
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📝 WalkthroughWalkthroughThe merge attribution tests now assert exact ChangesMerge attribution test stability
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to This tests-only change makes merge-attribution assertions resilient to SHA substring collisions, but the new regression test does not directly prove the bare-number collision it documents. The change is otherwise bounded, with a small remaining risk that this protection could be weakened without detection. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@tests/test_merge_attribution.py`:
- Around line 450-457: Strengthen the regression test around the UNMATCHED MERGE
stdout fixture by asserting that the bare substring “41” is present while the
PR-reference token “#41” is absent, and apply these shared assertions through
the common logic used by both cutoff tests. Preserve the existing collision
fixture and ensure both tests would fail if matching reverted to bare PR
numbers.
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changelog.d/tsk-oqpbvn-merge-attribution-flake.mdtests/test_merge_attribution.py
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…egression fixture
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Closes tsk-oqpbvn
What
tests/test_merge_attribution.py::TestMergeAttributionReconciliation::test_cutoff_excludes_pre_adoption_mergeshas hit CI three times in the last hour on unrelated PRs (#2798 shard 3.12/3, #2800 shard 3.13/3) viaassert "41" not in result.stdout. Two spots in this file asserted an excluded PR's number was a bare substring absent fromresult.stdout, but the fixture commit shas are generated at runtime by real git commits -- so whenever the IN-SCOPE PR's own sha (asserted present two lines earlier) happened to contain "41" as a hex-digit coincidence, the assertion failed for a reason unrelated to the reconciliation logic under test.Fixed both to assert on the exact PR-reference token the checker prints (
f"#{pr_num} {short}"->UNMATCHED MERGE: #42 <sha> -- no audit entry found), i.e."#41"/"#42", which cannot collide with a hex sha substring the way a bare number can.Added a deterministic regression test (
test_bare_pr_number_assertion_is_not_sha_safe) that fixes the collision directly with a hand-built stdout string rather than depending on a real git sha happening to reproduce it at test time -- the fix is not itself probabilistic.Sweep
grep -rnE 'assert "[0-9]+" (not )?in result' tests/plus a broader pass for any bare-digitnot in stdout/outputassertion against output containing a runtime-generated sha:tests/test_merge_attribution.py:427and:545-- the two hits, fixed here.assert "<digits>" in result...hits in the repo (test_shibaclaw_adapter.py,test_containers.py,test_container_docker.py,test_backend_adapters.py) assert presence of a fixed, deterministic value (an HTTP status code baked into a static error message), not absence from output containing runtime-random data -- not the same bug class, left alone.tests/test_auth_pin.py:194(assert "4913" not in raw) checks a salted argon2 hash -- also random per run, structurally the same flake shape, but not sha/PR-related and not part of this card's scope. Flagging for a separate look rather than touching it here.tests/test_log_redaction.py:134(assert "0000" not in out) is against a fully static, hardcoded input string -- no runtime randomness, not actually at risk.RED
Command:
python -m pytest tests/test_merge_attribution.py::TestMergeAttributionReconciliation::test_bare_pr_number_assertion_is_not_sha_safe -vGREEN
Command:
python -m pytest tests/test_merge_attribution.py -qSummary by CodeRabbit
Bug Fixes
Tests
Documentation