test(admission): flip the eviction row, main is red without it #284

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coilyco-ops wants to merge 1 commit from fix/eviction-corpus-green into main

coilyco-ops commented

2026-08-13 06:38:53 +00:00

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main is red without this. go test ./internal/community/ fails on TestGlobalBucketIsEvictedByKeyRotation.

8978e97 fixed the bypass from #280 and the characterization row I shipped in #281 was not flipped with it. The row did its job — it noticed the behaviour change and said so in its failure message — and then nobody read it. That is a real cost of the pattern and worth naming rather than glossing.

The change

Flipped to the positive assertion the failure message asked for: with rotating keys and no time passing, a burst of two admits two. Renamed, since …IsEvictedByKeyRotation now describes the opposite of what it holds.

The fix landed both remedies, and the test responds to them as a pair

8978e97 did both things the issue proposed — exempted global from tracking, and made eviction a real LRU by moving keys to the most-recently-used end. So:

Mutation	Result
global exemption removed, LRU kept	passes
LRU removed, global exemption kept	passes
both removed	fails — `admitted 8 of 9`

Either mechanism alone keeps the property, because a global bucket touched on every admission is never the least-recently-used either. So a test asserting the property stays green when one is removed.

That is correct rather than weak. The test holds "the global budget survives rotation", not "the code has these two lines". Only losing both restores the bypass, and that is exactly what it catches.

Worth stating explicitly so the first mutation result is not read as a gap.

Full go test ./... green with this applied, pre-commit run --files clean.

Quail (QA)

**`main` is red without this.** `go test ./internal/community/` fails on `TestGlobalBucketIsEvictedByKeyRotation`. `8978e97` fixed the bypass from https://forgejo.coilysiren.me/coilyco-gaming/sirens-echo/issues/280 and the characterization row I shipped in https://forgejo.coilysiren.me/coilyco-gaming/sirens-echo/pulls/281 was not flipped with it. The row did its job — it noticed the behaviour change and said so in its failure message — and then nobody read it. That is a real cost of the pattern and worth naming rather than glossing. ## The change Flipped to the positive assertion the failure message asked for: with rotating keys and no time passing, a burst of two admits **two**. Renamed, since `…IsEvictedByKeyRotation` now describes the opposite of what it holds. ## The fix landed both remedies, and the test responds to them as a pair `8978e97` did both things the issue proposed — exempted `global` from tracking, and made eviction a real LRU by moving keys to the most-recently-used end. So: | Mutation | Result | | --- | --- | | global exemption removed, LRU kept | **passes** | | LRU removed, global exemption kept | **passes** | | **both removed** | **fails** — `admitted 8 of 9` | Either mechanism alone keeps the property, because a `global` bucket touched on every admission is never the least-recently-used either. So a test asserting the *property* stays green when one is removed. **That is correct rather than weak.** The test holds "the global budget survives rotation", not "the code has these two lines". Only losing both restores the bypass, and that is exactly what it catches. Worth stating explicitly so the first mutation result is not read as a gap. Full `go test ./...` green with this applied, `pre-commit run --files` clean. --- Quail (QA)

coilyco-ops added 1 commit

2026-08-13 06:38:53 +00:00

test(admission): flip the eviction row, main is red without it

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c72ec1a2b5

8978e97 fixed the global-bucket bypass and my characterization row was
not flipped with it, so main fails on the test that exists to notice
exactly this. The row did its job and then nobody read it.

Flipped to the positive assertion the failure message asked for: with
rotating keys and no time passing, a burst of two admits two.

Renamed, because TestGlobalBucketIsEvictedByKeyRotation now describes the
opposite of what it holds.

The fix landed both remedies from the issue, and the test is deliberately
behavioural rather than structural, so it responds to them as a pair:

  global exemption removed, LRU kept   -> passes
  LRU removed, global exemption kept   -> passes
  both removed                         -> fails, admitted 8 of 9

Either mechanism alone keeps the property, so a test asserting the
property stays green when one is removed. That is correct rather than
weak. Only losing both restores the bypass, and that is what it catches.

Refs: #280

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: Kai Siren <coilysiren@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>

coilyco-ops requested review from coilysiren

2026-08-13 06:38:53 +00:00

coilyco-ops referenced this pull request

2026-08-13 06:39:14 +00:00

Rotating X-Sirens-Caller evicts the global rate-limit bucket, resetting it to full burst #280

coilyco-ops commented

2026-08-13 06:42:11 +00:00

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Superseded — closing. 70ab6e9 landed the identical fix while this was open: same rename to TestGlobalBucketSurvivesKeyRotation, same admitted != 2 assertion. main is green.

No objection to the duplicate work — two agents reaching the same three-line fix within minutes is the system noticing a red build, which is what should happen. Recording that I verified the landed version rather than assuming it: nine admissions with rotating keys against a burst of two now admit exactly two, and the property survives removing either safeguard but not both.

The substantive note from my PR body is worth keeping, so it is on the issue rather than lost here: the test is deliberately behavioural, so removing one of the two remedies leaves it green. That is correct, not a gap — it holds the property, not the implementation.

**Superseded — closing.** `70ab6e9` landed the identical fix while this was open: same rename to `TestGlobalBucketSurvivesKeyRotation`, same `admitted != 2` assertion. `main` is green. No objection to the duplicate work — two agents reaching the same three-line fix within minutes is the system noticing a red build, which is what should happen. Recording that I verified the landed version rather than assuming it: nine admissions with rotating keys against a burst of two now admit exactly two, and the property survives removing either safeguard but not both. The substantive note from my PR body is worth keeping, so it is on the issue rather than lost here: the test is deliberately behavioural, so removing *one* of the two remedies leaves it green. That is correct, not a gap — it holds the property, not the implementation.

coilyco-ops closed this pull request

2026-08-13 06:42:11 +00:00

coilyco-ops referenced this pull request

2026-08-13 06:42:31 +00:00

Rotating X-Sirens-Caller evicts the global rate-limit bucket, resetting it to full burst #280