} catch (IllegalArgumentException e) {
            assertTrue(e.getMessage().contains("data must not be null"));
        }
    }

    @Test
    public void testMemoryBasedCacheDefensiveCopy() throws IOException {
        byte[] data = "Hello, World!".getBytes();
        byte[] originalData = data.clone();
        ContentCache cache = new ContentCache(data);

        // Modify the original array