assertArrayEquals(new byte[] { 4, 3, 2, 1 }, dest, "Writer must be little‑endian");
    }

    @Test
    @DisplayName("writeULong handles negative values as unsigned")
    void testWriteULongNegative() {
        byte[] dest = new byte[4];
        NtlmMessage.writeULong(dest, 0, -1);
        assertArrayEquals(new byte[] { -1, -1, -1, -1 }, dest, "All bytes should be 0xFF for -1");
    }

    @Test