* feat(#1187): per-module mutation-score ratchet + graduate core-utils ADR-456's 80% mutation floor was unenforceable as a single global break=50: 4 of 6 covered modules sit at 63-79% and forcing them to 80 would require brittle exact-string assertions on equivalent string-literal mutants (a Goodhart's-Law trap). Instead, each covered module declares a minScore floor (locked at its measured score, TARGET 80) enforced per CI shard via stryker --break, ratcheting up over time without brittle tests. - mutation-matrix.cjs: minScore per module + TARGET_MUTATION_SCORE=80, emitted in the matrix; require.main guard + exports for testability. - mutation.yml: per-shard --break <minScore>. - stryker.config.mjs: global break 50->60 as a local backstop (CI uses minScore). - Graduated core-utils (measured 77.5%, floor 75). - context-utilization 79.5->92.3% via behavioral killers (state classification outputs + error-value contract, not exact-string matches) -> minScore 80 (TARGET). - ratchet-integrity guard test (28 cases). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(#1187): pass mutation break via MUTATION_BREAK env (no stryker --break flag) Adversarial review caught that Stryker 9.x has no --break CLI flag, so the per-shard 'stryker run --break <minScore>' errored out every mutation shard. Read the per-module floor from process.env.MUTATION_BREAK in stryker.config.mjs and set it per shard via env in mutation.yml. Red-green verified: MUTATION_BREAK=99 exits 1, =80 exits 0. Also make the ratchet guard monotonic (RATCHET_BASELINE floors; lowering a floor now fails the guard unless the baseline is edited). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(#1187): fail closed on bad MUTATION_BREAK + monotonic ratchet baseline Code review: Number(env)||60 failed OPEN — an empty/invalid MUTATION_BREAK (e.g. a future module missing minScore -> matrix expands to '') silently degraded the shard to break 60, letting a high-floor module regress undetected. resolveMutationBreak() now returns 60 only when the env is truly unset (local backstop) and THROWS on present-but-empty/non-numeric/out-of-range (fail closed); stryker.config.mjs imports it via createRequire. Also make RATCHET_BASELINE an equality mirror (=== not >=) so any floor change is explicit in review and no floor can be silently lowered. Tests: 46 (incl resolveMutationBreak cases). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(#1187): recalibrate config-schema/prompt-budget floors to CI scores First CI mutation run failed two shards: the floors were set from local Stryker runs whose TIMEOUTS were counted as kills (env-variable), inflating scores. CI runs with timeout~0, so the real deterministic scores are lower: - config-schema: local 69.7% -> CI 54.55% (5 local timeouts vanished) -> floor 52 - prompt-budget: local 99.6% -> CI 68.33% (239 local timeouts vanished) -> floor 66 Calibrate floors from CI (the documented source of truth) and record the lesson in the comment so future floors aren't set from timeout-inflated local runs. Baseline updated to match. The other 5 shards passed (deterministic CI scores above their floors). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Tom Boucher
@@ -249,4 +249,87 @@ describe('context-utilization property tests', () => {
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)
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);
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});
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// ─── STATES string-literal mutation killers ───────────────────────────────
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// Stryker survivors: HEALTHY/WARNING/CRITICAL → "" (StringLiteral mutants).
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// The property tests above use STATES.HEALTHY etc. which would still pass
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// even if all strings were emptied (self-comparison). These tests assert the
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// LITERAL string values — the documented public API contract of STATES.
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test('STATES.HEALTHY literal value is "healthy"', () => {
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assert.strictEqual(
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STATES.HEALTHY,
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'healthy',
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'STATES.HEALTHY must be the string "healthy" (catches StringLiteral mutant → "")'
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);
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});
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test('STATES.WARNING literal value is "warning"', () => {
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assert.strictEqual(
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STATES.WARNING,
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'warning',
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'STATES.WARNING must be the string "warning" (catches StringLiteral mutant → "")'
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);
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});
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test('STATES.CRITICAL literal value is "critical"', () => {
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assert.strictEqual(
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STATES.CRITICAL,
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'critical',
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'STATES.CRITICAL must be the string "critical" (catches StringLiteral mutant → "")'
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);
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});
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test('classifyContextUtilization state values are the documented string literals', () => {
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// Asserts the actual returned state strings — not just STATES membership.
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// Kills mutants that swap the STATES object values to empty strings.
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const healthy = classifyContextUtilization(0, 10000);
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assert.strictEqual(healthy.state, 'healthy', 'zero tokens must produce state "healthy"');
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const warning = classifyContextUtilization(6000, 10000);
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assert.strictEqual(warning.state, 'warning', '60% tokens must produce state "warning"');
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const critical = classifyContextUtilization(7000, 10000);
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assert.strictEqual(critical.state, 'critical', '70% tokens must produce state "critical"');
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});
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// ─── Error message content mutation killers ───────────────────────────────
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// Stryker survivors: error message template → "" (StringLiteral mutants).
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// Asserting only TypeError type doesn't kill these — need message content.
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test('TypeError for bad tokensUsed includes descriptive message mentioning the value', () => {
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const badValue = -5;
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try {
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classifyContextUtilization(badValue, 10000);
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assert.fail('Expected TypeError was not thrown');
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} catch (err) {
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assert.ok(err instanceof TypeError);
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assert.ok(
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err.message.includes(String(badValue)),
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`Error message must include the bad value (${badValue}), got: "${err.message}"`
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);
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assert.ok(
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err.message.length > 0,
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'Error message must not be empty (catches StringLiteral → "" mutant)'
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);
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}
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});
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test('TypeError for bad contextWindow includes descriptive message mentioning the value', () => {
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const badValue = 0;
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try {
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classifyContextUtilization(100, badValue);
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assert.fail('Expected TypeError was not thrown');
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} catch (err) {
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assert.ok(err instanceof TypeError);
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assert.ok(
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err.message.includes(String(badValue)),
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`Error message must include the bad value (${badValue}), got: "${err.message}"`
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);
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assert.ok(
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err.message.length > 0,
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'Error message must not be empty (catches StringLiteral → "" mutant)'
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);
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}
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});
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});
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295
tests/mutation-matrix-ratchet.test.cjs
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295
tests/mutation-matrix-ratchet.test.cjs
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@@ -0,0 +1,295 @@
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'use strict';
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/**
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* tests/mutation-matrix-ratchet.test.cjs
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*
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* Guards the per-module mutation-score ratchet contract defined in
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* scripts/mutation-matrix.cjs (ADR-456 / issue #1187).
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*
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* Assertions:
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* (a) TARGET_MUTATION_SCORE is exported as a numeric constant equal to 80.
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* (b) Every COVERED module declares a numeric minScore (50 ≤ minScore ≤ 100).
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* (c) The matrix entry emitted by buildResult() / the script's JSON output
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* includes minScore for each module.
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* (d) A COVERED module missing minScore causes the above assertions to fail
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* (negative proof — ensured by the ≥50 / ≤100 range check).
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*
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* Design note: this test imports the script's internals via require() — the
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* script exports COVERED and TARGET_MUTATION_SCORE so they can be tested
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* without subprocess overhead. buildResult() is not exported so we verify the
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* matrix output by running the script as a child process (stdin pipe mode).
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*/
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const { test, describe } = require('node:test');
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const assert = require('node:assert/strict');
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const { execFileSync } = require('node:child_process');
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const path = require('node:path');
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const MATRIX_SCRIPT = path.resolve(__dirname, '../scripts/mutation-matrix.cjs');
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const matrix = require(MATRIX_SCRIPT);
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// ── (a) TARGET_MUTATION_SCORE ─────────────────────────────────────────────────
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describe('mutation-matrix ratchet: TARGET_MUTATION_SCORE export', () => {
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test('exports TARGET_MUTATION_SCORE', () => {
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assert.ok(
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Object.prototype.hasOwnProperty.call(matrix, 'TARGET_MUTATION_SCORE'),
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'mutation-matrix.cjs must export TARGET_MUTATION_SCORE'
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);
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});
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test('TARGET_MUTATION_SCORE is numeric', () => {
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assert.strictEqual(
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typeof matrix.TARGET_MUTATION_SCORE,
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'number',
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'TARGET_MUTATION_SCORE must be a number'
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);
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});
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test('TARGET_MUTATION_SCORE equals 80', () => {
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assert.strictEqual(
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matrix.TARGET_MUTATION_SCORE,
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80,
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'TARGET_MUTATION_SCORE must equal 80 (ADR-456 floor)'
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);
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});
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});
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// ── (b) every COVERED module has a valid minScore ─────────────────────────────
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describe('mutation-matrix ratchet: per-module minScore in COVERED', () => {
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test('exports COVERED object', () => {
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assert.ok(
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Object.prototype.hasOwnProperty.call(matrix, 'COVERED'),
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'mutation-matrix.cjs must export COVERED'
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);
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assert.strictEqual(typeof matrix.COVERED, 'object');
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assert.ok(matrix.COVERED !== null);
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});
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const covered = matrix.COVERED || {};
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const moduleNames = Object.keys(covered);
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test('COVERED has at least one module', () => {
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assert.ok(moduleNames.length > 0, 'COVERED must contain at least one module');
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});
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for (const name of moduleNames) {
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describe(`module: ${name}`, () => {
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test(`${name}: declares minScore`, () => {
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const entry = covered[name];
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assert.ok(
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Object.prototype.hasOwnProperty.call(entry, 'minScore'),
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`COVERED['${name}'] must have a minScore property`
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);
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});
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test(`${name}: minScore is a number`, () => {
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const entry = covered[name];
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assert.strictEqual(
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typeof entry.minScore,
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'number',
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`COVERED['${name}'].minScore must be a number`
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);
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});
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test(`${name}: minScore is between 50 and 100 (inclusive)`, () => {
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const entry = covered[name];
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assert.ok(
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entry.minScore >= 50,
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`COVERED['${name}'].minScore (${entry.minScore}) must be ≥ 50`
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);
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assert.ok(
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entry.minScore <= 100,
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`COVERED['${name}'].minScore (${entry.minScore}) must be ≤ 100`
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);
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});
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});
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}
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});
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// ── (c) matrix JSON emitted by the script includes minScore per module ────────
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describe('mutation-matrix ratchet: matrix JSON output includes minScore', () => {
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test('script emits valid JSON with minScore in each matrix include entry', () => {
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// Use stdin pipe mode: pass every COVERED module's src/*.cts path as
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// "changed" files so all modules appear in the matrix output.
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// computeMatrix() matches `src/<module>.cts` — derive from the module name.
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const covered = matrix.COVERED || {};
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const moduleNames = Object.keys(covered);
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const stdinLines = moduleNames.map(name => `src/${name}.cts`).join('\n');
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const raw = execFileSync(
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process.execPath,
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[MATRIX_SCRIPT],
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{
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input: stdinLines + '\n',
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encoding: 'utf8',
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cwd: path.resolve(__dirname, '..'),
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}
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);
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let result;
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try {
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result = JSON.parse(raw);
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} catch (e) {
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assert.fail(`mutation-matrix.cjs did not emit valid JSON: ${e.message}\nOutput: ${raw}`);
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}
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assert.strictEqual(result.has_work, 'true', 'has_work must be "true" when covered modules change');
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assert.ok(Array.isArray(result.matrix.include), 'matrix.include must be an array');
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assert.ok(result.matrix.include.length > 0, 'matrix.include must not be empty');
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for (const entry of result.matrix.include) {
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assert.ok(
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Object.prototype.hasOwnProperty.call(entry, 'minScore'),
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`matrix entry for '${entry.name}' must include minScore in JSON output`
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);
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assert.strictEqual(
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typeof entry.minScore,
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'number',
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`matrix entry for '${entry.name}' minScore must be a number`
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);
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assert.ok(
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entry.minScore >= 50 && entry.minScore <= 100,
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`matrix entry for '${entry.name}' minScore (${entry.minScore}) must be between 50 and 100`
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);
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}
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});
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});
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// ── (d) negative proof: missing minScore is detectable ───────────────────────
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describe('mutation-matrix ratchet: guard detects missing minScore', () => {
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test('a module entry without minScore would fail the range check (50-100)', () => {
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// Simulate the invariant: if minScore is missing, typeof === 'undefined',
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// which is not 'number' → the per-module assertion above would catch it.
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const fakeEntry = { cjs: 'foo.cjs', tests: ['tests/foo.test.cjs'] };
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assert.notStrictEqual(
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typeof fakeEntry.minScore,
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'number',
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'An entry without minScore must NOT pass the typeof-number check'
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);
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// Also verify that undefined < 50 and undefined > 100 are both false,
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// meaning the ≥50 check below would also catch it if typeof were lenient.
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assert.ok(
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!(fakeEntry.minScore >= 50),
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'undefined minScore must fail the ≥50 guard'
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);
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});
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});
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// ── (e) monotonic ratchet: minScore must exactly match baseline ───────────────
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// RATCHET_BASELINE is a deliberate review-visible mirror of the floors in COVERED.
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//
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// CONTRACT: every COVERED module's minScore must EQUAL its entry here.
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// ANY change to a floor (up or down) requires updating RATCHET_BASELINE in the
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// same diff, making the change explicit in code review. This prevents a floor
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// from being raised in COVERED and later silently lowered back to baseline.
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//
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// To ADD a new module to COVERED: add a baseline entry here in the same diff.
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// The assertion "every COVERED module has a baseline" enforces this.
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// The assertion "every baseline module still exists in COVERED" enforces the
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// reverse: removing a module from COVERED also requires updating the baseline.
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const RATCHET_BASELINE = {
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'context-utilization': 80,
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'prompt-budget': 66, // CI 68.33% 2026-06-14; was 90 (timeout-inflated local)
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'frontmatter': 62,
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'adr-parser': 68,
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'config-schema': 52, // CI 54.55% 2026-06-14; was 68 (timeout-inflated local)
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'active-workstream-store': 80,
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'core-utils': 75,
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};
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describe('mutation-matrix ratchet: floor equality enforcement', () => {
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const covered = matrix.COVERED || {};
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const coveredNames = Object.keys(covered);
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test('every COVERED module has a RATCHET_BASELINE entry (new modules must add one)', () => {
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for (const name of coveredNames) {
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assert.ok(
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Object.prototype.hasOwnProperty.call(RATCHET_BASELINE, name),
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`COVERED module '${name}' has no RATCHET_BASELINE entry — add one before merging`
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);
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}
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});
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test('every RATCHET_BASELINE module still exists in COVERED (removed modules must drop their baseline entry)', () => {
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for (const name of Object.keys(RATCHET_BASELINE)) {
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assert.ok(
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Object.prototype.hasOwnProperty.call(covered, name),
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`RATCHET_BASELINE has entry for '${name}' but it no longer exists in COVERED — remove the baseline entry`
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);
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}
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});
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for (const name of coveredNames) {
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test(`${name}: minScore === baseline (${RATCHET_BASELINE[name] ?? 'NO BASELINE'}) — any floor change must update RATCHET_BASELINE`, () => {
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const baseline = RATCHET_BASELINE[name];
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if (baseline === undefined) {
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// Already caught by the presence check above; skip the numeric compare
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// to avoid a confusing NaN comparison error.
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assert.fail(`no RATCHET_BASELINE for '${name}' — add it`);
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return;
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}
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const actual = covered[name].minScore;
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assert.strictEqual(
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actual,
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baseline,
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`COVERED['${name}'].minScore (${actual}) !== RATCHET_BASELINE (${baseline}) — update RATCHET_BASELINE to match the new floor`
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);
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});
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}
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});
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// ── (f) resolveMutationBreak behaviour ───────────────────────────────────────
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describe('resolveMutationBreak: fail-closed env-var resolver', () => {
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const { resolveMutationBreak } = matrix;
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test('exports resolveMutationBreak as a function', () => {
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assert.strictEqual(typeof resolveMutationBreak, 'function');
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});
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test('undefined → 60 (local run backstop)', () => {
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assert.strictEqual(resolveMutationBreak(undefined), 60);
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});
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test("'' (empty string) → throws (CI shard wiring error)", () => {
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assert.throws(
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() => resolveMutationBreak(''),
|
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/MUTATION_BREAK is set but empty/
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);
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});
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test("' ' (whitespace-only) → throws (CI shard wiring error)", () => {
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assert.throws(
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() => resolveMutationBreak(' '),
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/MUTATION_BREAK is set but empty/
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);
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});
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test("'abc' → throws (non-numeric)", () => {
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assert.throws(
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() => resolveMutationBreak('abc'),
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/MUTATION_BREAK invalid/
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);
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});
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test("'0' → throws (out of range: below 1)", () => {
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assert.throws(
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() => resolveMutationBreak('0'),
|
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/MUTATION_BREAK invalid/
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);
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});
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test("'150' → throws (out of range: above 100)", () => {
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assert.throws(
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() => resolveMutationBreak('150'),
|
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/MUTATION_BREAK invalid/
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||||
);
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});
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test("'80' → 80", () => {
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assert.strictEqual(resolveMutationBreak('80'), 80);
|
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});
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test("'62' → 62", () => {
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assert.strictEqual(resolveMutationBreak('62'), 62);
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user