assertEquals("1.024MB", MemoryUtil.byteCountToDisplaySize(1024L * 1024L));
        assertEquals("1.024GB", MemoryUtil.byteCountToDisplaySize(1024L * 1024L * 1024L));
    }

    @Test
    public void test_sizeOf_nullObject() {
        assertEquals(0L, MemoryUtil.sizeOf(null));
    }

    @Test
    public void test_sizeOf_stringVariations() {
        // Empty string
        assertEquals(56L, MemoryUtil.sizeOf(""));