@Test
public void testInitializeMbTilesLayersWithSingleFile() {

    Pair<Set<Source>, Set<Layer>> layersAndSources = mbTilesHelper.initializeMbTileslayers(new File("src/test/resources/raster.mbtiles"));
    assertNotNull(layersAndSources);
    assertEquals(1, layersAndSources.first.size());
    assertEquals(1, layersAndSources.second.size());
    assertNotNull(mbTilesHelper.tileServer);
    Source source = layersAndSources.first.iterator().next();
    Layer layer = layersAndSources.second.iterator().next();
    assertTrue(source instanceof RasterSource);
    assertTrue(layer instanceof RasterLayer);
}