@Test
public void testDragToMoveMultiple() {

  testDragToSelectMultiple(); // to select the two tiles
  selector.select(firstTile);
  selector.select(secondTile);
  clickOn(firstTile)
      .drag()
      .dropBy(0, 128);
  waitForFxEvents();
  assertEquals(new GridPoint(0, 1), pane.getTileLayout(firstTile).origin);
  assertEquals(new GridPoint(1, 1), pane.getTileLayout(secondTile).origin);
}