[开发测试]Android 单元测试中遇到的一些问题汇总

1. verifyNoMoreInteractions(listener);//验证没有更多交互
2. @Mock private PlaybackParametersListener listener; initMocks(this);在使用 Androidunit4 时同样可以使用 Mockito；
3. assertThat(mediaClock.syncAndGetPositionUs( false)).isEqualTo(TEST_POSITION_US);
4. @Config(sdk = 29) // Allows using MediaFormat.getKeys() to make assertions over the expected keys.//写在类名上方
5. 单元测试：上下文：context = InstrumentationRegistry.getTargetContext();
6. Context applicationContext = ApplicationProvider.getApplicationContext()
7. 反射调用私有静态方法

        //调用私有静态的
        Method method = Camera1Enumerator.class.getDeclaredMethod("getCameraInfo", Integer.class);
        method.setAccessible(true);
        android.hardware.Camera.CameraInfo cameraInfo = (android.hardware.Camera.CameraInfo) method.invoke(mCamera1Enumerator, 0);
        Assert.assertNotNull( cameraInfo);

8. 屏蔽静态代码块加载：@SuppressStaticInitializationFor(“com.rz.paas.internal.RZRtcEngineImpl”)//阻止静态代码块运行

9. 反射回去静态属性‘
   private Class reflectClass, reflectRecord; //用以获取私有属性
   private Field mbluetoothManager, maudioManager;
   reflectClass = mDBAudioManager.getClass();
   reflectRecord = mDBAudioRecord.getClass();
   mbluetoothManager = reflectClass.getDeclaredField(“bluetoothManager”);//私有属性
   mbluetoothManager.setAccessible(true);
   //获取其值
   mbluetoothManager.get(mDBAudioManager)
   //设置其值
   mbluetoothManager.set(mDBAudioManager,value)

10. 描述

/**
 * 2021-08-06 Unit tests for {@link EncodedImage}.
 */

11. 测试异常 @Test(expected = IllegalStateException.class)
12. 抽象类的反射
    私有属性：

私有属性的变量 = 抽象类 .class.getDeclaredField("私有属性");
私有属性的变量.setAccessible(true);

方法

AbstractClass.class.getMethod("getName").invoke(子类对象); 

12. cameraName

cameraName = "Camera 0, Facing back, Orientation 90";
cameraName_Back = "Camera 1, Facing front, Orientation 270";

13. 单元测试测试线程

Thread thread = new Thread(){
    @Override
    public void run() {
        super.run();
        for (int i = 0; i < 5; i++) {
            System.out.println(i);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
};

@Test
public void createTextureBufferWithModifiedTransformMatrix() throws Exception{
    thread.start();
    thread.join();
    System.out.println("线程执行结束");
}

thread.join(); 等待线程执行结束！

13. 测试回调

/**
 * 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();
    //作用类似于 thread.join(); 等待线程执行结束
    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");
}

输出结果：
testBlindCallback
before AsyncDemo doJob
onStart
onProgress: 0
onProgress: 1
onProgress: 2
onProgress: 3
onProgress: 4
onFinish
after AsyncDemo doJob

15. 初始化无参构造器
    mCamera1Session = Camera1Session.class .newInstance();
16. Mac 运行 .sh 文件， sh ./build_libs.sh
17. 一个Volatile;

@Test
public void test() throws Exception {
    AoFlag aoFlag = new AoFlag();
    aoFlag.start();
    for (int i = 0; i < 300; i++) {
        if (aoFlag.isFlag())
            Log.e("TAG\t\t\t", "test: ~~~ "+i);
    }
    aoFlag.join();
}
class AoFlag extends Thread {
    boolean flag = false;
    public boolean isFlag() {
        return flag;
    }
    @Override
    public void run() {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        flag = true;
        Log.e("TAG\t\t\t", "run: " + flag);
    }
}
//输出只有：TAG			: run: true

18. 乐观锁、悲观锁;
19. Synchronized
20. 理解协程、LiveData 和 Flow
21. 没有LiveData如何实现轻松MVVM

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