### Question:
DragAndDropHelper { Element findElementByPosition(final int position) { return dragArea.querySelector("[" + DATA_POSITION + "=\"" + position + "\"]"); } DragAndDropHelper(final HTMLElement dragArea,
                             final HTMLElement addButtonContainer);   }### Answer:
@Test public void testFindElementByPosition() { final int position = 1; helper.findElementByPosition(position); verify(dragArea).querySelector("[" + DATA_POSITION + "=\"" + position + "\"]"); }