java - Android测试方法中如何mock方法调用？

Question

我为我的 Android 应用程序编写测试，我需要模拟我的类中的一个方法，该方法在我测试的方法中调用。这是我的课:

public class MyFirebaseMessagingService extends FirebaseMessagingService {
.....
 @Override
public void onMessageReceived(RemoteMessage remoteMessage) {
            if (!isAppOnForeground(this)) {
                DoSomeThing();
            }
        }
    }

public boolean isAppOnForeground(Context context) {
       return isAppOnForeground;
    }
}

我想在 isAppOnForeground 返回 true 和 false 时测试 onMessageReceived 方法。

我试试

@Test
public void onMessageReceived() {
MyFirebaseMessagingService mockMyFirebaseMessagingService = org.mockito.Mockito.mock(MyFirebaseMessagingService.class);
when(mockMyFirebaseMessagingService.isAppOnForeground(any(Context.class))).thenReturn(false);
mockMyFirebaseMessagingService.onMessageReceived(remoteMessage);
...
}

但是当我运行此测试时，我没有看到方法 onMessageReceived 中的调用(断点不起作用)。如何模拟 isAppOnForeground 并调用 onMessageReceived？

Answer 1

您看不到 onMessageReceived() 方法正在运行，因为它没有运行。

MyFirebaseMessagingService mockMyFirebaseMessagingService = org.mockito.Mockito.mock(MyFirebaseMessagingService.class);

您正在创建一个模拟，一个空的模拟，它对原始类的实现一无所知。

您想使用spy()来代替。试试这个:

MyFirebaseMessagingService myFirebaseMessagingService = new MyFirebaseMessagingService();
MyFirebaseMessagingService mockMyFirebaseMessagingService = org.mockito.Mockito.spy(myFirebaseMessagingService);
doReturn(false).when(mockMyFirebaseMessagingService).isAppOnForeground(any(Context.class));
mockMyFirebaseMessagingService.onMessageReceived(remoteMessage);