test: touchfile superset check for modules moved out of browse/src/server.ts

Records the paid evals selected by touching browse/src/server.ts at 96764e80
(17 E2E, 1 LLM judge) and asserts every browse/src/routes/*.ts module selects
a superset. The test reads every golden in test/fixtures/moved-module-selection/
so other moved-code goldens can sit beside it.

test/fixtures/moved-module-selection/w3-browse-routes.json

@@ -0,0 +1,40 @@
+{
+  "workstream": "W3 browse route table",
+  "recordedAt": "96764e80",
+  "source": "browse/src/server.ts",
+  "modules": [
+    "browse/src/routes/activity.ts",
+    "browse/src/routes/commands.ts",
+    "browse/src/routes/core.ts",
+    "browse/src/routes/files.ts",
+    "browse/src/routes/index.ts",
+    "browse/src/routes/inspector.ts",
+    "browse/src/routes/pairing.ts",
+    "browse/src/routes/pty.ts",
+    "browse/src/routes/table.ts",
+    "browse/src/routes/tokens.ts",
+    "browse/src/routes/tunnel.ts"
+  ],
+  "e2e": [
+    "aside-browse-basic",
+    "aside-browse-flow",
+    "benchmark-workflow",
+    "browse-basic",
+    "browse-snapshot",
+    "canary-workflow",
+    "carve-section-loading",
+    "design-review-detector-shim-dom",
+    "design-review-fix",
+    "diagram-authoring-quality",
+    "diagram-triplet",
+    "qa-b6-static",
+    "qa-b7-spa",
+    "qa-b8-checkout",
+    "qa-fix-loop",
+    "qa-only-no-fix",
+    "qa-quick"
+  ],
+  "llmJudge": [
+    "browse/SKILL.md reference"
+  ]
+}

test/touchfile-moved-module-selection.test.ts

@@ -0,0 +1,61 @@
+/**
+ * Touchfile coverage for moved code.
+ *
+ * Each JSON file in test/fixtures/moved-module-selection/ records, before a
+ * refactor moved code out of `source`, the paid evals selected by touching
+ * that source file. Touching any module the code moved into must select a
+ * superset, so a move can never silently drop eval coverage.
+ */
+
+import { describe, test, expect } from 'bun:test';
+import * as fs from 'node:fs';
+import * as path from 'node:path';
+import { E2E_TOUCHFILES, LLM_JUDGE_TOUCHFILES, GLOBAL_TOUCHFILES, selectTests } from './helpers/touchfiles';
+
+const ROOT = path.resolve(import.meta.dir, '..');
+const GOLDEN_DIR = 'test/fixtures/moved-module-selection';
+
+interface Golden { workstream: string; source: string; modules: string[]; e2e: string[]; llmJudge: string[] }
+
+const goldens = fs.readdirSync(path.join(ROOT, GOLDEN_DIR))
+  .filter(f => f.endsWith('.json'))
+  .map(f => ({ file: `${GOLDEN_DIR}/${f}`, golden: JSON.parse(fs.readFileSync(path.join(ROOT, GOLDEN_DIR, f), 'utf-8')) as Golden }));
+
+function missingSelections(module: string, golden: Golden): string[] {
+  const e2e = new Set(selectTests([module], E2E_TOUCHFILES, GLOBAL_TOUCHFILES).selected);
+  const judge = new Set(selectTests([module], LLM_JUDGE_TOUCHFILES, GLOBAL_TOUCHFILES).selected);
+  return [
+    ...golden.e2e.filter(t => !e2e.has(t)).map(t => `E2E ${t}`),
+    ...golden.llmJudge.filter(t => !judge.has(t)).map(t => `LLM judge ${t}`),
+  ];
+}
+
+describe('moved modules keep their source file\'s paid-eval selection', () => {
+  test('at least one golden is recorded', () => {
+    expect(goldens.length).toBeGreaterThan(0);
+  });
+
+  for (const { file, golden } of goldens) {
+    test(`${golden.workstream}: every module moved out of ${golden.source} selects a superset`, () => {
+      const problems: string[] = [];
+      for (const module of golden.modules) {
+        if (!fs.existsSync(path.join(ROOT, module))) problems.push(`${module}  (listed in ${file} but missing)`);
+        for (const miss of missingSelections(module, golden)) problems.push(`${module}  does not select ${miss}`);
+      }
+      if (problems.length) {
+        throw new Error([
+          'Moved modules lost paid-eval selection:',
+          ...problems.map(p => `  ${p}`),
+          `Rule: code moved out of ${golden.source} must keep every eval that touching ${golden.source} selected, or a regression in the moved code ships unevaluated.`,
+          `Fix: add the new module to ${golden.source}'s touchfile entries in test/helpers/touchfiles-data.ts (a directory glob is fine).`,
+          `Golden: ${file} — re-record it only when the source file's own selection legitimately changes.`,
+        ].join('\n'));
+      }
+    });
+  }
+
+  test('a module outside every touchfile entry is reported', () => {
+    const golden: Golden = { workstream: 'self-test', source: 'browse/src/server.ts', modules: [], e2e: ['browse-basic'], llmJudge: [] };
+    expect(missingSelections('nowhere/planted-module.ts', golden)).toEqual(['E2E browse-basic']);
+  });
+});