// Write a valid string structure
        String testString = "TEST";
        int totalChars = testString.length();
        writeLittleEndianInt(dos, totalChars); // totalChars
        writeLittleEndianInt(dos, 0); // unusedChars
        writeLittleEndianInt(dos, totalChars); // usedChars

        // Write the actual characters (as shorts in little-endian)
        for (char c : testString.toCharArray()) {