### Question:
DNDListDOMHelper { static void setCSSTop(final HTMLElement element, final int value) { element.style.setProperty("top", value + "px"); }   static final String DRAGGING; }### Answer:
@Test public void testSetCSSTop() { element.style = mock(CSSStyleDeclaration.class); setCSSTop(element, 123); verify(element.style).setProperty("top", "123px"); }