private void stubMockPosts(List<Long> postIds, List<Post> mockPosts) {
   when(component.getMockHackerNewsService().getTopStories()).thenReturn(Observable.just(postIds));
   for (Long id : postIds) {
     for (Post post : mockPosts) {
       if (post.id.equals(id)) {
         when(component.getMockHackerNewsService().getStoryItem(id.toString()))
             .thenReturn(Observable.just(post));
       }
     }
   }
 }
  @Test
  public void testJobPostHasViewButton() throws Exception {
    List<Long> postIdList = new ArrayList<>();
    Post mockPost = MockModelsUtil.createMockJobWithTitle("Post with url");
    postIdList.add(mockPost.id);
    when(component.getMockHackerNewsService().getTopStories())
        .thenReturn(Observable.just(postIdList));
    when(component.getMockHackerNewsService().getStoryItem(mockPost.id.toString()))
        .thenReturn(Observable.just(mockPost));

    Intent i = new Intent(MainActivity.getStartIntent(InstrumentationRegistry.getTargetContext()));
    main.launchActivity(i);
    onView(withId(R.id.text_view_post)).check(matches(isDisplayed()));
  }