### Question:
HtmlSeLionElementSet extends SeLionElementSet { public static HtmlSeLionElementSet getInstance() { return INSTANCE; } HtmlSeLionElementSet(Collection<SeLionElement> elements); static HtmlSeLionElementSet getInstance(); boolean add(String element); List<GUIObjectDetails> getGUIObjectList(List<String> keys);  }### Answer:
@Test public void testGet() { SeLionElementSet elementSet = HtmlSeLionElementSet.getInstance(); assertNotNull(elementSet); assertTrue(elementSet.size() >= 14); assertTrue(elementSet.contains(HtmlSeLionElement.BUTTON)); }