tegwick
0c52461801
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
85 lines
4.3 KiB
Markdown
85 lines
4.3 KiB
Markdown
# Lab Ground Truth
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**Lab version base:** `lab-0.2.0` · **Catalogue:** 23 mutations · **Scenarios:**
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`scenarios/alice_bob_carol.py` (API-only) and `scenarios/full_journey.py`
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(cross-surface)
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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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| 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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| M21 | Controls reworded and test ids dropped | MECHANICAL | **dropped** | PASS *(UI: out of scope)* |
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| M22 | Form field names changed | MECHANICAL | **dropped** | PASS *(UI: out of scope)* |
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| M23 | Sharing control removed from UI, API left open | DEFECT | preserved | PASS *(UI: out of scope)* |
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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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## Coverage is scoped twice over
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A scenario protects what it asserts (F-0002) **and** only what it can reach. The
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reference scenario is API-only, so the three UI mutations above are outside its
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scope entirely — M23 is a genuine defect it cannot see. They are covered by the
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cross-surface journey instead, where M23 is the E-003 surface-substitution
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attack. Both facts are declared in `OUT_OF_SCOPE` and asserted: an undeclared
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invisible mutation fails the suite, and so does a declaration that has gone
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stale.
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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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## Classifier response (cross-surface journey)
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Measured in `tests/test_classification.py`. **False Adaptation Rate = 0/7.**
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| Ground truth | Accepted without a human |
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| MECHANICAL (12) | 11 — M22 escalates as `AMBIGUOUS` |
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| SEMANTIC (4) | 2 — M13 and M14, both genuinely inert |
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| DEFECT (7) | **0** |
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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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