### Question:
HiddenHelper { public static void show(final Element element) { element.classList.remove(HIDDEN_CSS_CLASS); }  static void hide(final Element element); static void show(final Element element); static boolean isHidden(final Element element); static final String HIDDEN_CSS_CLASS; }### Answer:
@Test public void testShow() { final Element element = mock(Element.class); final DOMTokenList classList = mock(DOMTokenList.class); element.classList = classList; HiddenHelper.show(element); verify(classList).remove(HIDDEN_CSS_CLASS); }