// Calculate expected size based on actual behavior
        long actualSize = MemoryUtil.sizeOf(complexMap);
        assertEquals(689L, actualSize);
    }

    public void test_getUsedMemory_variations() {
        // Test multiple calls to ensure consistency
        long memory1 = MemoryUtil.getUsedMemory();
        assertTrue(memory1 >= 0);

        // Create some objects to change memory usage