@Test
public void unWatch() throws Exception {

    TestSubscriber<Boolean> subscriber = TestSubscriber.create();
    repositoryDataSource.unWatch("TellH", "GitClub").subscribe(subscriber);
    subscriber.assertValue(true);
    subscriber = TestSubscriber.create();
    repositoryDataSource.checkWatching("TellH", "GitClub").subscribe(subscriber);
    subscriber.assertValue(false);
}