@Test
public void getBackgroundDataWithIndex() {

    List<BackgroundDataWithIndex> backgroundDataWithIndex = background.getBackgroundDataWithIndex();
    assertEquals(background.getUnmodifiableData().size(), backgroundDataWithIndex.size());
    BackgroundDataWithIndex backgroundData = backgroundDataWithIndex.get(0);
    int index = backgroundData.getIndex();
    assertEquals(background.getDataByIndex(index - 1), backgroundData.getScesimData());
}