test: cover review edge cases and repair paths

app/comments.test.js

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+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { postOldFindingsComment, postNewNonCriticalComment, postNewCriticalComments } from './comments.js';
+
+describe('comment publishers', () => {
+  it('skips publishing when there are no matching findings', async () => {
+    let called = 0;
+    await postOldFindingsComment([], async () => { called += 1; });
+    await postNewNonCriticalComment([], async () => { called += 1; });
+    await postNewCriticalComments([], async () => { called += 1; });
+    assert.equal(called, 0);
+  });
+
+  it('publishes old, non-critical, and critical comments in separate calls', async () => {
+    const bodies = [];
+    const findings = [
+      { level: 'warning', role: 'Rex', location: 'a.js:1', suggestion: 'fix', is_new: false },
+      { level: 'info', role: 'Maya', location: 'b.js:2', suggestion: 'note', is_new: true },
+      { level: 'critical', role: 'Aria', location: 'c.js:3', suggestion: 'stop', is_new: true },
+    ];
+
+    await postOldFindingsComment(findings, async body => bodies.push(body));
+    await postNewNonCriticalComment(findings, async body => bodies.push(body));
+    await postNewCriticalComments(findings, async body => bodies.push(body));
+
+    assert.equal(bodies.length, 3);
+    assert.match(bodies[0], /舊有未解決問題/);
+    assert.match(bodies[1], /新發現問題/);
+    assert.match(bodies[2], /嚴重問題/);
+  });
+});