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test(context): pin recovery from a partial index file and generation-bound content

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- A build interrupted while writing the index leaves a partial file under
  its digest name before the pointer exists. The next build rejects those
  bytes ("content changed under its digest") and cannot repair the index.
- A skill edited after the entries are read leaves an index that still
  matches the stored generation, and the next build reports that
  generation stale. This pins the current behavior: the index is bound to
  the generation, not to live sources.
This commit is contained in:
montjeffrey
2026-10-09 18:57:52 -04:00
parent da8c702435
commit 335f329618
1 changed files with 32 additions and 0 deletions
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tests/lib/context-routing-index.test.js
+32
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@@ -188,6 +188,38 @@ test('an anchored suggestion is not hidden by unanchored candidates ranked above
assert.deepEqual(routing.suggestContext(index, 'migrate database schema safely today').map(item => item.id), ['skill:schema-tool']);
});
test('an index file left partial by an interrupted build is replaced on the next build', () => fixture(({ repoRoot, stateRoot }) => {
store.applyStore({ repoRoot, stateRoot, target: 'claude' });
const { path: file } = routing.writeRoutingIndex({ repoRoot, stateRoot });
const bytes = fs.readFileSync(file);
// A build that stops mid-write leaves a partial file under the digest name
// and has not yet published the pointer.
const directory = path.join(stateRoot, 'routing');
fs.rmSync(path.join(directory, fs.readdirSync(directory).find(name => name.endsWith('.json'))));
fs.writeFileSync(file, bytes.subarray(0, Math.floor(bytes.length / 2)));
assert.equal(routing.readRoutingIndex(stateRoot), null);
routing.writeRoutingIndex({ repoRoot, stateRoot });
assert.ok(fs.readFileSync(file).equals(bytes));
assert.equal(routing.routingIndexStatus(stateRoot).status, 'current');
}));
test('a source edited after entries are read leaves an index that matches the stored generation', () => fixture(({ repoRoot, stateRoot }) => {
store.applyStore({ repoRoot, stateRoot, target: 'claude' });
const selection = require('../../scripts/lib/context-selection');
const original = selection.routingEntries;
const skill = path.join(repoRoot, 'skills/feature/SKILL.md');
const stored = fs.readFileSync(skill, 'utf8').match(/description: (.*)/)[1];
selection.routingEntries = options => {
const routed = original(options);
fs.writeFileSync(skill, fs.readFileSync(skill, 'utf8').replace(/description: .*/, 'description: Edited after entries'));
return routed;
};
try { routing.writeRoutingIndex({ repoRoot, stateRoot }); } finally { selection.routingEntries = original; }
assert.equal(routing.readRoutingIndex(stateRoot).entries.find(entry => entry.id === 'skill:feature').description, stored);
// The drift is the generation's, and the next build reports it.
assert.throws(() => routing.writeRoutingIndex({ repoRoot, stateRoot }), /stale/);
}));
test('a skill edited during the build never publishes an index under the stored generation', () => fixture(({ repoRoot, stateRoot }) => {
store.applyStore({ repoRoot, stateRoot, target: 'claude' });
const selection = require('../../scripts/lib/context-selection');