Merge branch '313553005' of https://github.com/nanlioniya/113-spring-software-testing into 313553005

Author: nanlioniya

lab2/main_test.js

@@ -1,7 +1,6 @@
-const { test } = require('node:test');
-const assert = require('node:assert');
-const { Application, MailSystem } = require('./main.js');
-const fs = require('fs');
+const test = require('node:test');
+const assert = require('assert');
+const { Application, MailSystem } = require('./main');
 
 /*
     function coverage testing: