assertEquals("909.494PB", MemoryUtil.byteCountToDisplaySize(1000_000_000_000_000_000L));
        assertEquals("1.024EB", MemoryUtil.byteCountToDisplaySize(FileUtils.ONE_EB));
    }

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

    public void test_sizeOf() throws Exception {
        // System.out.println("size: " + getObjectSize(""));