assertEquals(18, ServerMessageBlock2.size8(15, 2));
        }

        @Test
        @DisplayName("Should calculate padding")
        void testPad8() {
            testMessage.encode(new byte[1024], 0);
            // After header is written, padding depends on position
            int headerStart = testMessage.getHeaderStart();

        assertThat(list.getLast(), is("1"));
        list.getLastEntry().remove();
        assertThat(list.size(), is(0));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testAdd() throws Exception {
        list.addLast("1");
        list.addLast("2");
        list.addLast("3");
        list.add(1, "4");
        assertThat(list.get(1), is("4"));
        assertThat(list.get(2), is("2"));

    @Mock
    private MemoryDataHelper dataHelper;

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        MockitoAnnotations.openMocks(this);
    }

    public void test_add() {
        // Setup
        String sessionId = "session123";
        String url = "https://example.com/page";
        Queue<UrlQueueImpl<Long>> mockQueue = new LinkedList<>();