### Question:
Lists { public static <T> boolean isEmpty(List<T> suspect) { return suspect == null || suspect.isEmpty(); } private  Lists(); static List<T> gen(T... elements); static List<T> gen(int size, GenCall<T> generator); static U gen(int size, Class<U> container, GenCall<T> generator); static List<T> each(List<T> elements, EachCall<T> callback); static List<T> collect(List<T> elements, CollectCall<T> callback); static Map<String, List<T>> group(List<T> elements, GroupCall<T> callback); static boolean isEmpty(List<T> suspect); static PartialList<T> emptyPartialList(); @SuppressWarnings("rawtypes")
    static final PartialList EMPTY_PARTIAL_LIST; }### Answer:
@Test public void isEmptyテスト() { assertTrue(Lists.isEmpty(Collections.emptyList())); assertTrue(Lists.isEmpty(null)); }