@Override
    public boolean add(final Integer value) {
        return add(value.intValue());
    }
@Test
    @SuppressWarnings("UnnecessaryBoxing")
    public void containsAddedBoxedElements() {
        assertTrue(set.add(1));
        assertTrue(set.add(Integer.valueOf(2)));

        assertContains(set, Integer.valueOf(1));
        assertContains(set, 2);
    }