### Question:
ListItemViewCssHelper { public static void asFocusedDataType(final Element element) { element.classList.add(FOCUSED_CSS_CLASS); }  static void asRightArrow(final Element element); static void asDownArrow(final Element element); static boolean isRightArrow(final Element element); static void asFocusedDataType(final Element element); static void asNonFocusedDataType(final Element element); static boolean isFocusedDataType(final Element element); static final String RIGHT_ARROW_CSS_CLASS; static final String DOWN_ARROW_CSS_CLASS; static final String FOCUSED_CSS_CLASS; }### Answer:
@Test public void testAsFocusedDataType() { final Element element = mock(Element.class); final DOMTokenList classList = mock(DOMTokenList.class); element.classList = classList; ListItemViewCssHelper.asFocusedDataType(element); verify(classList).add(FOCUSED_CSS_CLASS); }