// Nested arrays
        assertEquals(120L, MemoryUtil.sizeOf(new Object[] { new String[] { "test" }, new String[] { "test" } }));
    }

    @Test
    public void test_sizeOf_collectionVariations() {
        // Empty collection
        assertEquals(0L, MemoryUtil.sizeOf(new ArrayList<>()));

        // Collection with null elements
        List<String> listWithNulls = new ArrayList<>();