}

    // Tests for instance methods

    @Test
    @DisplayName("writeWireFormat should write header and trailer")
    void testWriteWireFormat() {
        packet.type = SessionServicePacket.SESSION_MESSAGE;
        packet.trailerLength = 10; // Mock trailer will write 10 bytes

        byte[] dst = new byte[50];

        assertEquals(12, packet.rDataLength);
        assertNotNull(packet.addrEntry);
        assertEquals(2, packet.addrEntry.length);
    }

    @Test
    void testWriteWireFormat() {
        byte[] dst = new byte[50];
        packet.nameTrnId = 0x1234;
        packet.questionCount = 1;
        packet.questionType = NameServicePacket.NB;
        packet.questionClass = NameServicePacket.IN;