android - 如何为通知进行android单元测试？

Question

我有类 handleFirebaseMessages 。它包含函数 onMessageReceived() 。此功能负责接收数据和创建通知。 onMessageReceived() 在 RemoteMessages 对象中接收数据。我正在尝试为此功能编写测试。但我还没有完全明白。

HandleFirebaseMessages

public class HandleFirebaseMessages extends FirebaseMessagingService {
@Override
    public void onMessageReceived(final RemoteMessage remoteMessage) {
   final Map<String, String> data = remoteMessage.getData();
    //create notifications using NotificationCompat.Builder
    }
 }

我已经能够编写部分测试代码。我该如何完成这个？

@Test
public  void testHandleFirebaseMessages() throws  Exception {

    Map<String,String> data=new HashMap<String,String>();
    data.put("id","4422");
    data.put("type", "1");
    data.put("imageUrl" , "https://image.freepik.com/free-vector/android-boot-logo_634639.jpg");
    data.put("smallTitle" , "DoJMA v2");
    data.put("smallSubTitle", "Update now from Google Play Store");
    data.put("ticker" , "New update for DoJMA");
    data.put("contentInfo" , "");
    data.put("link" , "https://photo2.tinhte.vn/data/avatars/l/1885/1885712.jpg?1402763583");
    data.put("className" , "HomeActivity");
    data.put("page" , "2");
    data.put("bigTitle" , "DoJMA Android app version 2 released!");
    data.put("bigSubTitle" , "Hi folks! New DoJMA update is here! Major redesigning and improvements! This app was made by the Mobile App Club.They work really hard man...and get good products");
    data.put("bigSummaryText" , "Update now");


    RemoteMessage message = new RemoteMessage.Builder("1")
            .setMessageId("1")
            .setData(data)
            .build();
    (new HandleFirebaseMessages()).onMessageReceived(message);

    //WHat now?
}

Answer 1

您通过包装 Notifications API 来测试它以使其可测试。首先，您需要一种将模拟依赖项传递给包装器构造函数的方法。你可以这样写:

class NotificationBuilderProvider {

    //TODO: implement Provider<NotificationCompat.Builder> if you are using JSR-330 annotations

    private Context context;

    NotificationBuilderProvider(Context context) {
        this.context = context;
    }

    @Override
    public NotificationCompat.Builder get() {
        return new NotificationCompat.Builder(context);
    }

}

现在你可以像这样写一个包装器:

class NotificationsWrapper {

    private final NotificationBuilderProvider notificationBuilderProvider;
    private final NotificationManager notificationManager;

    NotficiationsWrapper(NotificationBuilderProvider notificationBuilderProvider, NotificationManager notificationManager) {
        this.notificationBuilderProvider = notificationBuilderProvider;
        this.notificationManager = notificationManager;
    }

    public void postNotification(Map<String, String> data) {
        Notification notification = notificationBuilderProvider.get()
            .setContentTitle(data.get("Title"))
            //etc
            .build();
        notificationManager.notify(ID, notification);
    }
}

现在您可以为您的 NotificationWrapper 编写单元测试，这比测试重量级服务更容易测试:

//mocks
NotificationBuilderProvider mockNotificationBuilderProvider;
NotificationBuilder mockNotificationBuilder;
NotificationManager mockNotificationManager;


//system under test
NotificationWrapper notificationWrapper;

@Before
public void setUp() {
     mockNotificationBuilderProvider = Mockito.mock(NotificationBuilderProvider.class);
     mockNotificationBuilder = Mockito.mock(NotificationCompat.Builder.class, RETURNS_SELF);
     mockNotifyManager = Mockito.mock(NotificationManager.class);
}

@Test
public void givenTitleInData_whenPost_thenNotificationHasContentTitle() {
     //arrange
     Map<String, String> data = new HashMap<>();
     data.put("Title", "MyTitle");

     //act
     notificationsWrapper.postNotification(data);

     //assert
     verify(notificationBuilder).setContentTitle(eq("Title"));
}

如果这一切看起来有点复杂，最好从为简单类编写单元测试开始，直到您熟悉单元测试和模拟的概念。然后您可以继续测试更复杂的类。 Mockito documentation是开始学习模拟和单元测试的好地方。祝你好运!