@Test
public void deleteCommentDeletesOnService() {

    String postId = "postId";
    String commentId = "commentiD";
    when(service.deleteComment(postId, commentId)).thenReturn(Observable.<Void>empty());
    TestSubscriber<Void> ts = new TestSubscriber<>();
    network.deleteComment(postId, commentId).subscribe(ts);
    ts.assertNoErrors();
    ts.assertCompleted();
}