Resolve merge conflicts

Author: 你的GitHub帳號名稱

lab2/main_test.js

@@ -1,3 +1,4 @@
+<<<<<<< HEAD
 const assert = require('assert');
 const test = require('node:test');
 const { Application, MailSystem } = require('./main');
@@ -184,4 +185,5 @@ test('notifySelected should send mail to all selected people', async (t) => {
 // 我們使用單獨的測試進行清理
 test('Cleanup test environment', async () => {
   await removeTestFile();
-});
+});
+