@Junit不支持多线程得测试

问题： 在一次学习mq，写单元测试得时候，发现并不支持多线程测试。如果开多个线程，主线程运行结束就结束了，并不会等待子线程执行完。

解决思路：在子线程结束前，阻塞主线程。

解决方案：

　　（1）让主线程休眠10s

    @Test
    public void threadTest() throws InterruptedException {
        //(1)让主线程休眠10s
        for (int i = 0; i <5 ; i++) {
            new Thread(new ThreadDemo()).start();
        }
        Thread.sleep(10000);
        
    }

    class ThreadDemo implements  Runnable{
        @Override
        public void run() {
            System.out.println("当前线程-----"+Thread.currentThread().getId());
        }
    }

　　(2)使用join

    @Test
    public void threadTest() throws InterruptedException {
        
        //(2) 将子线程加入到主线程中，这样一来就能确保子线程得逻辑先执行结束后在执行主线程
        ThreadDem  thread1 = new ThreadDemo();
        ThreadDemo thread2 = new ThreadDemo();
        thread1.start();
        thread2.start();
        thread1.join();
        thread2.join();

    }

    class ThreadDemo extends   Thread{
        @Override
        public void run() {
            for (int i = 0; i <3 ; i++) {
                System.out.println("当前线程-----"+Thread.currentThread().getId());
            }
        }
    }

　　(3)使用CountDownLatch

    @Test
    public void threadTest() throws InterruptedException {
        
        CountDownLatch latch = new CountDownLatch(2);
        ThreadDemo  thread1 = new ThreadDemo ();
        ThreadDemo  thread2 = new ThreadDemo();
        thread1.start();
        thread2.start();
        latch.await();


    }

    class ThreadDemo  extends   Thread{
        @Override
        public void run() {
            for (int i = 0; i <3 ; i++) {
                System.out.println("当前线程-----"+Thread.currentThread().getId());
            }
        }
    }

参考链接： （1）https://blog.csdn.net/w605283073/article/details/92016433?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522160384792219724835815719%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=160384792219724835815719&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~first_rank_v2~rank_v28-1-92016433.pc_first_rank_v2_rank_v28&utm_term=Test%E4%B8%8D%E6%94%AF%E6%8C%81%E5%A4%9A%E7%BA%BF%E7%A8%8B&spm=1018.2118.3001.4187