Iterator<String> i = lru.keySet().iterator();
        assertThat(i.next(), is("bbb"));
        assertThat(i.next(), is("ccc"));
        assertThat(i.next(), is("aaa"));
        lru.put("ddd", "444");
        assertThat(lru.size(), is(3));
        assertThat(lru.get("bbb"), is(nullValue()));
        i = lru.keySet().iterator();
        assertThat(i.next(), is("ccc"));
        assertThat(i.next(), is("aaa"));

     */
    @Test
    public void testRemoveNothing() throws Exception {
        final String[] array = new String[] { "111", "222", "333" };
        final String[] newArray = ArrayUtil.remove(array, "444");
        assertThat(newArray, is(sameInstance(array)));
    }

    /**
     *
     */
    @Test
    public void testIsEmpty() {
        assertTrue(ArrayUtil.isEmpty((Object[]) null));