java单元测试之如何实现异步接口的测试案例

    @Test
    public void testExplicitThread() {
        System.out.println("testExplicitThread");
        Thread thread = new Thread() {
            @Override
            public void run() {
                System.out.println("thread start.");
                try {
                    for (int i = 0; i < 5; i++) {
                        System.out.println("progress: " + i);
                        sleep(1000);
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    System.out.println("thread finish.");
                }
            }
        };
        thread.start();
        try {
            thread.join(); // 等待线程执行完毕
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("testExplicitThread exit");
    }

    /**
     * 回调接口
     */
    interface Callback {
        void onStart();
        void onProgress(int progress);
        void onFinish();
    }
 
    /**
     * 异步方法
     */
    static class AsyncDemo {
        private int len = 0;
        private Callback callback = null;
        public AsyncDemo(int len, Callback cb) {
            this.len = len;
            this.callback = cb;
        }
 
        public void doJob() {
            new Thread() {
                @Override
                public void run() {
                    if (null != callback) {
                        callback.onStart();
                    }
                    try {
                        for (int i = 0; i < len; i++) {
                            if (null != callback) {
                                callback.onProgress(i);
                            }
                            sleep(1000);
                        }
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    } finally {
                        if (null != callback) {
                            callback.onFinish();
                        }
                    }
                }
            }.start();
        }
    }
 
    private Object mLock = new Object(); // 同步锁
    private int mCount = 0; // 加解锁条件
 
    @Test
    public void testBlindCallback() {
        System.out.println("testBlindCallback");
        Callback cb = new Callback() {
 
            public void onStart() {
                System.out.println("onStart");
            }
 
            public void onProgress(int progress) {
                System.out.println("onProgress: " + progress);
            }
 
            public void onFinish() {
                System.out.println("onFinish");
                synchronized (mLock) {
                    mCount = 0;
                    mLock.notifyAll(); // 回调执行完毕，唤醒主线程
                }
            }
        };
        System.out.println("before AsyncDemo doJob");
        AsyncDemo demo = new AsyncDemo(5, cb);
        demo.doJob();
        synchronized (mLock) {
            mCount = 1;  // 设置锁条件
            while (mCount > 0) {
                try {
                mLock.wait(); // 等待唤醒
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println("after AsyncDemo doJob");
    }