Unit test Glide: make sure ImageView has correct image

Android Studio 3.0 Beta 5
robolectric:3.3.1

I have a the following view holder that loads a image url using the glide library. I am trying to find a way to unit test this:

    public class MovieActorsViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.civActorPicture) CircleImageView actorPicture;
        @BindView(R.id.tvName) TextView name;
        @BindView(R.id.tvCharacter) TextView character;

        private Context context;

        public MovieActorsViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);

            context = itemView.getContext();
        }

        public void populateActor(Actor actor) {
            Glide.with(context)
                    .load(actor.getPicturePath())
                    .placeholder(R.drawable.people_placeholder)
                    .into(actorPicture);

            name.setText(actor.getName());
            character.setText(actor.getCharacter());
        }
    }

This is the unit test I have done, but I am not sure how can I unit test the image view. I am not sure using Mockito to mock the Glide library would work?

@RunWith(RobolectricTestRunner.class)
public class MovieActorsViewHolderTest {
    private MovieActorsViewHolder movieActorsViewHolder;

    @Before
    public void setup() {
        final Context context = ShadowApplication.getInstance().getApplicationContext();
        final View view = LayoutInflater.from(context).inflate(R.layout.movie_actors_item, new LinearLayout(context));

        movieActorsViewHolder = new MovieActorsViewHolder(view);
    }

    @Test
    public void testShouldPopulateActorWithValidData() {
        final Actor actor = getActor();
        movieActorsViewHolder.populateActor(actor);

        /* test that the image view */
    final ShadowDrawable shadowDrawable = Shadows.shadowOf(movieActorsViewHolder.actorPicture.getDrawable());
    final Drawable drawable = Drawable.createFromPath(actor.getPicturePath());
    assertThat(drawable, is(shadowDrawable.getCreatedFromResId()));

        assertThat(movieActorsViewHolder.name.getText(), is(actor.getName()));
        assertThat(movieActorsViewHolder.character.getText(), is(actor.getCharacter()));
    }

  private Actor getActor() {
    return new Actor(
            "https://image.tmdb.org/t/p/w92/dRLSoufWtc16F5fliK4ECIVs56p.jpg",
            "Robert Danny Junior",
            "Iron Man");
}

}

Output:

Expected: is <org.robolectric.shadows.ShadowBitmapDrawable@ffffffe0>
     but: was <android.graphics.drawable.BitmapDrawable@ffffffe0>
Expected :is <org.robolectric.shadows.ShadowBitmapDrawable@ffffffe0>

Actual   :<android.graphics.drawable.BitmapDrawable@ffffffe0>

Many thanks for any suggestions.