tegwick
4ddb2f896c
lab/app.py (users, tenants, auth, resources, sharing, read/write, revoke, audit), lab/http_api.py (JSON API + browser UI, stdlib only), 20 labelled composable version-stamped mutations, ground-truth matrix. 48 tests pass. Detection against the reference scenario: MECHANICAL 0/10 flagged (correct), DEFECT 6/6, SEMANTIC 2/4 with both inert cases declared. - F-0002: M16 and M18 initially escaped detection entirely. A use case protects exactly what it asserts. Resolved by adding two claims already stated as intent in INTENT.md; the six-mutation catalogue would never have surfaced this. - test-id axis added: stable selectors survive most UI mutations, which would make H-001 trivially false. Mutations now vary on preserves_test_ids so the hypothesis is analysed split by that axis rather than rigged. - M12 (semantic deferred revoke) and M19 (defect race) are behaviourally identical and asserted as such - the discrimination problem as a test. lab/minimal.py removed; superseded by lab/app.py. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Assistant: claude-code Assistant-Model: opus Assistant-Process: 1629012@bnt-lap001 Assistant-Session: 78d4fb13-8a1e-474b-87a3-9b9261c49a39
61 lines
3.1 KiB
Markdown
61 lines
3.1 KiB
Markdown
# Lab Ground Truth
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**Lab version base:** `lab-0.2.0` · **Catalogue:** 20 mutations · **Scenario:**
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`scenarios/alice_bob_carol.py`
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Labels are decided by a human from the use case and recorded **before** any run.
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They are never inferred from behaviour — that is the whole point, and M12/M19
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below show why.
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| ID | Mutation | Label | Test ids | Reference scenario |
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|---|---|---|---|---|
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| M01 | Sharing control moves into a modal | MECHANICAL | preserved | PASS |
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| M02 | DOM rewritten, test ids not carried forward | MECHANICAL | **dropped** | PASS |
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| M03 | API renames `resource_id` to `id` | MECHANICAL | preserved | PASS |
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| M04 | UI labels reworded | MECHANICAL | preserved | PASS |
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| M05 | Form field order reversed | MECHANICAL | preserved | PASS |
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| M06 | API paths shortened | MECHANICAL | preserved | PASS |
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| M07 | Buttons become anchors | MECHANICAL | preserved | PASS |
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| M08 | Revoke gains a confirmation step | MECHANICAL | preserved | PASS |
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| M09 | Responses are slower | MECHANICAL | preserved | PASS |
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| M10 | Denials return 401 instead of 403 | MECHANICAL | preserved | PASS |
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| M11 | A share must be accepted first | SEMANTIC | preserved | FAIL |
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| M12 | Revocation is deferred by decision | SEMANTIC | preserved | FAIL |
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| M13 | Grants default to WRITE | SEMANTIC | preserved | PASS *(inert)* |
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| M14 | Cross-tenant sharing declared prohibited | SEMANTIC | preserved | PASS *(inert)* |
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| M15 | Revocation updates record but not enforcement | DEFECT | preserved | FAIL |
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| M16 | A READ grant confers WRITE | DEFECT | preserved | FAIL |
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| M17 | Any authenticated user can read anything | DEFECT | preserved | FAIL |
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| M18 | Revocation is not audited | DEFECT | preserved | FAIL |
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| M19 | Revocation propagates after a delay | DEFECT | preserved | FAIL |
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| M20 | Tenant isolation leaks | DEFECT | preserved | FAIL |
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Baseline: PASS. Detection: **MECHANICAL 0/10 flagged** (correct — semantics
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preserved), **DEFECT 6/6 flagged**, **SEMANTIC 2/4 flagged**.
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## The two inert mutations
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Recorded rather than hidden. `test_inert_semantic_mutations_are_declared` fails
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if an invisible mutation is ever left undeclared.
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- **M13** only affects grants that omit a permission; the reference scenario
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passes `READ` explicitly, so nothing changes.
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- **M14** is a change of *intent* with no change of code — cross-tenant sharing
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was already enforced, and the mutation declares it deliberate. Nothing
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observable moves. This is the sharpest available demonstration that
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classification cannot be a diff.
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## M12 vs M19 — the discrimination problem in one row
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Both produce an identical failure: `c-bob-revoked`, same step, same evidence.
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One is a deliberate product decision that revocation batches; the other is a
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propagation race. **No observation distinguishes them.** Only intent does.
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This is why claims require independent provenance (D-06), why `AMBIGUOUS`
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escalates to a human rather than resolving itself, and why T08's classifier is
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not permitted to guess.
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## Regenerating
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The matrix is asserted in `tests/test_lab_ground_truth.py`. A moved cell fails
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the suite: changing the measuring instrument must be a deliberate, reviewed act.
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