assertTrue(length > 0);
            assertEquals(20, customBlock.getByteCount());
        }

        @Test
        @DisplayName("Test write string with odd Unicode alignment")
        void testWriteStringUnicodeAlignment() {
            testBlock.setUseUnicode(true);
            byte[] buffer = new byte[100];
            String testString = "Test";

            // Test odd Unicode alignment - headerStart affects alignment