}

    @Test
    public void test_getUsedMemory() {
        assertTrue(MemoryUtil.getUsedMemory() >= 0);
    }

    @Test
    public void test_sizeOf() throws Exception {
        // System.out.println("size: " + getObjectSize(""));
        assertEquals(24L, MemoryUtil.sizeOf(Integer.MAX_VALUE));
        assertEquals(24L, MemoryUtil.sizeOf(Long.MAX_VALUE));