[BOM-1182] refactor: 리뷰어 배정을 2025-bom-bom 이벤트 방식으로 이관

.github/scripts/check-overdue.test.js

@@ -0,0 +1,46 @@
+'use strict';
+
+const { test } = require('node:test');
+const assert = require('node:assert/strict');
+const { buildNotification } = require('./check-overdue');
+
+test('buildNotification: 멘션과 초과 시간 필드를 생성한다', () => {
+  const now = new Date('2026-07-03T12:00:00Z');
+  const assignments = [
+    {
+      id: 1,
+      pr_number: 10,
+      pr_title: '기능 추가',
+      deadline_at: '2026-07-03T09:00:00Z',
+      reviewer: { github_username: 'a', display_name: '유저A' },
+    },
+  ];
+  const { mentions, fields } = buildNotification(assignments, { a: '111' }, now);
+  assert.equal(mentions, '<@111>');
+  assert.deepEqual(fields, [
+    { name: '#10 기능 추가', value: '담당: 유저A · 3시간 초과' },
+  ]);
+});
+
+test('buildNotification: 매핑 없는 유저는 username으로, 중복 멘션은 제거한다', () => {
+  const now = new Date('2026-07-03T12:00:00Z');
+  const assignments = [
+    {
+      id: 1,
+      pr_number: 10,
+      pr_title: 'A',
+      deadline_at: '2026-07-03T11:00:00Z',
+      reviewer: { github_username: 'x', display_name: 'X' },
+    },
+    {
+      id: 2,
+      pr_number: 11,
+      pr_title: 'B',
+      deadline_at: '2026-07-03T10:00:00Z',
+      reviewer: { github_username: 'x', display_name: 'X' },
+    },
+  ];
+  const { mentions, fields } = buildNotification(assignments, {}, now);
+  assert.equal(mentions, 'x');
+  assert.equal(fields.length, 2);
+});