test(review): prove fail-open status contract

test/reviewFailOpen.test.js

@@ -0,0 +1,45 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { openDb } from '../src/lib/db.js';
+import { runReview } from '../src/lib/review.js';
+
+const HEAD = 'a'.repeat(40);
+
+test('an unavailable review posts success without hiding the failure', async () => {
+  const statuses = [];
+  const db = openDb(':memory:');
+  const gitea = {
+    postStatus: async (_owner, _repo, _sha, body) => statuses.push(body),
+    getCommitDiff: async () => { throw new Error('review service unavailable'); }
+  };
+  const job = {
+    owner: 'o', repo: 'r', sha: HEAD, before: null, prIndex: null,
+    event: 'push', pusher: 'tester', authors: [], commitMessages: []
+  };
+
+  const result = await runReview({
+    cfg: {
+      publicBaseUrl: 'https://reviews.example.test',
+      maxDiffBytes: 1024,
+      model: 'claude-cli/claude-sonnet-4-6',
+      botUsername: 'reviewer'
+    },
+    gitea,
+    adminGitea: null,
+    db,
+    job,
+    withGlobal: async (fn) => fn(),
+    log: () => {}
+  });
+
+  assert.equal(result.ok, false);
+  assert.deepEqual(statuses.map(({ state }) => state), ['pending', 'success']);
+  assert.equal(statuses[1].context, 'granthi-review');
+  assert.equal(statuses[1].description, 'review unavailable — diff fetch failed (not blocking)');
+
+  const persisted = db.prepare(
+    'SELECT status_state, error FROM reviews WHERE repo = ? AND sha = ?'
+  ).get('o/r', HEAD);
+  assert.equal(persisted.status_state, 'success');
+  assert.match(persisted.error, /review service unavailable/);
+});