Roboelectric test gridview onclick starts new activity

I am stuck creating a test that checks if the next activity is fired, but using a gridview on click. This means that if you click one click, it will launch a new Activity (DetailActivity). I am providing a gridview adapter that collects data from a list.

Here's the complete code:

@Test
public void shouldDisplayDetailActivityWhenAdapterClicked() throws Exception{
    List<ImageNode> nodes = new ArrayList<ImageNode>();
    ImageNode node = new ImageNode();
    node.setId(36597698);
    node.setContributorId("halfpoint");
    node.setFileName("halfpoint150200457");
    node.setFolder("halfpoint1502");
    node.setDescription("halfpoint1502");
    node.setMediaType("halfpoint1502");
    node.setUrlThumb(URLHelper.buildThumbUrl(
            node.getId(),
            node.getContributorId(),
            node.getFolder(),
            node.getFileName(),
            node.getDescription()));
    node.setUrlFullSize(URLHelper.buildFullSizeUrl(node.getUrlThumb()));
    nodes.add(node);
    DetailLikeBoxAdapter mAdapter = new DetailLikeBoxAdapter(activity, nodes);
    GridView gridView = (GridView) activity.findViewById(R.id.likebox_gridview);
    View itemView = mAdapter.getView(0, null, gridView);
    gridView.performItemClick(itemView, 0, mAdapter.getItemId(0));
    Intent startedIntent = shadowOf(activity).getNextStartedActivity();
    startedIntent.putExtra(CommonConstants.DETAIL_IMAGE_KEY, node.getId());
    startedIntent.putExtra(CommonConstants.DETAIL_IMAGE_POS, 0);
    startedIntent.putExtra(CommonConstants.DETAIL_IMAGE_URLFULLSIZES,node.getUrlFullSize() );
    startedIntent.putExtra(CommonConstants.IS_BUILD_CATEGORY, false);// get intent of next activity on stack
    ShadowIntent shadowIntent = shadowOf(startedIntent);            // create shadow intent which starts next activity
    assertEquals(DetailActivity.class.getName(), shadowIntent.getComponent().getClassName()); // compare shadow intent w/ desired next activity
}

      

        
        
        
      

    

Error: java.lang.NullpointerException.

any ideas will be suggested. Thank.