@Test
public void retrieveUserFollowingsCallsNetwork() {

    String id = "userId";
    when(network.retrieveUserFollowings(id)).thenReturn(Observable.just(userPage));
    TestSubscriber<RxPage<List<User>>> ts = new TestSubscriber<>();
    tapglue.retrieveUserFollowings(id).subscribe(ts);
    assertThat(ts.getOnNextEvents(), hasItems(userPage));
}