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os-sdlc: mutation overlap report (mutation testing increment 5) #1637

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opened 2026-11-08 15:24:35 +00:00 by jared · 2 comments

jared commented

2026-11-08 15:24:35 +00:00

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Problem

Jared suspects duplicated behavior as the cause of suite growth. The Mutineer kill matrix shows overlap: shared mutant kills across files, cross-class kills, and one class killed by many unrelated files. The plan section on the overlap lesson defines the report and its caveat (untested duplicate copies are not detected). This ticket needs increment 4.

Reproduce

n/a: feature ticket.

Approach

Source: docs/research/mutation-testing/plan-v1-2026-11-08.md, table "Increments, in order", row 5. The section "Rulings" is binding; do not re-decide it. Decompose against the plan before implementation.

Origin

Trigger: plan docs/research/mutation-testing/plan-v1-2026-11-08.md (commit b90d8253), ruled by Jared 2026-11-07 and 2026-11-08
Improvised this session: none
Chain: suite doubled in six weeks (757 test files, 3,572 test methods) ← suspected duplicated behavior and tests with no demonstrated value ← no mutation evidence in the gate. End: DESIGN (docs/research/mutation-testing/plan-v1-2026-11-08.md)
Root candidate: none found; searched mutation, mutineer, mutant, survivor, taxonomy, redundant test, blind test, duplicate, overlap, ledger
Where: plugins/os-sdlc (overlap report)
Session: ff703e34-8046-4b24-af68-6ef76d8aa338
Transcript: /home/jared/.claude/projects/-home-jared-dev-cc-os-plugins-os-sdlc/ff703e34-8046-4b24-af68-6ef76d8aa338.jsonl

VERDICT: CREATE

## Problem Jared suspects duplicated behavior as the cause of suite growth. The Mutineer kill matrix shows overlap: shared mutant kills across files, cross-class kills, and one class killed by many unrelated files. The plan section on the overlap lesson defines the report and its caveat (untested duplicate copies are not detected). This ticket needs increment 4. ## Reproduce n/a: feature ticket. ## Approach Source: `docs/research/mutation-testing/plan-v1-2026-11-08.md`, table "Increments, in order", row 5. The section "Rulings" is binding; do not re-decide it. Decompose against the plan before implementation. ## Origin - Trigger: plan `docs/research/mutation-testing/plan-v1-2026-11-08.md` (commit b90d8253), ruled by Jared 2026-11-07 and 2026-11-08 - Improvised this session: none - Chain: suite doubled in six weeks (757 test files, 3,572 test methods) ← suspected duplicated behavior and tests with no demonstrated value ← no mutation evidence in the gate. End: DESIGN (`docs/research/mutation-testing/plan-v1-2026-11-08.md`) - Root candidate: none found; searched mutation, mutineer, mutant, survivor, taxonomy, redundant test, blind test, duplicate, overlap, ledger - Where: plugins/os-sdlc (overlap report) - Session: ff703e34-8046-4b24-af68-6ef76d8aa338 - Transcript: /home/jared/.claude/projects/-home-jared-dev-cc-os-plugins-os-sdlc/ff703e34-8046-4b24-af68-6ef76d8aa338.jsonl VERDICT: CREATE

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2026-11-08 15:24:35 +00:00

jared changed title from ~~os-sdlc: whole-codebase mutation pass (mutation testing increment 4)~~ to os-sdlc: mutation overlap report (mutation testing increment 5)

2026-11-08 15:24:55 +00:00

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2026-11-08 15:25:03 +00:00

jared commented

2026-11-08 15:25:04 +00:00

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Blocked on #1636 (increment 4, whole-codebase pass), which supplies the kill matrix. Plan: docs/research/mutation-testing/plan-v1-2026-11-08.md, row 5.

jared referenced this issue

2026-11-08 17:53:48 +00:00

os-sdlc: test taxonomy classifier (mutation testing increment 2) #1634

jared referenced this issue

2026-11-08 18:07:27 +00:00

os-sdlc: test taxonomy classifier (mutation testing increment 2) #1634

jared referenced this issue

2026-11-08 19:15:13 +00:00

os-backlog CLI has no label-add or label-remove command #867

jared commented

2026-11-08 20:57:19 +00:00

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Owner

Resolution

Done: MutationTest::Overlap computes the three plan signals from the kill matrix after the BEHAVIOR and ledger filter and prints them as TSV sections through os-sdlc-mutation-pass overlap.

Evidence: commit 8e2537db on main; suite 3626 runs 0 failures; rubocop clean on 18 files; history row in docs/implementation-status/os-sdlc.md

Follow-ups: none; the lesson text stays in the plan, the report prints rows only

## Resolution **Done:** MutationTest::Overlap computes the three plan signals from the kill matrix after the BEHAVIOR and ledger filter and prints them as TSV sections through os-sdlc-mutation-pass overlap. **Evidence:** commit 8e2537db on main; suite 3626 runs 0 failures; rubocop clean on 18 files; history row in docs/implementation-status/os-sdlc.md **Follow-ups:** none; the lesson text stays in the plan, the report prints rows only

jared closed this issue

2026-11-08 20:57:19 +00:00

jared referenced this issue from a commit

2026-11-08 20:57:21 +00:00

feat(os-sdlc): mutation overlap report finds shared kills, sole foreign killers, and many-killer owners (#1637)

jared referenced this issue from a commit

2026-11-08 20:57:21 +00:00

docs(os-sdlc): history row for #1637 overlap report; plan v1 all increments built