assertEquals(0x85, packet.type);
        assertEquals(10, packet.length);
    }

    @Test
    @DisplayName("writeHeaderWireFormat should write correct header")
    void testWriteHeaderWireFormat() {
        packet.type = SessionServicePacket.SESSION_REQUEST;
        packet.length = 0x1234;

        byte[] dst = new byte[10];
        int written = packet.writeHeaderWireFormat(dst, 0);

        assertEquals(1, packet.questionCount);
        assertEquals(NameServicePacket.IN, packet.questionClass);
        assertEquals(mockConfig, packet.config);
    }

    @Test
    void testWriteHeaderWireFormat() {
        byte[] dst = new byte[NameServicePacket.HEADER_LENGTH];
        packet.nameTrnId = 0x1234;
        packet.isResponse = true;
        packet.opCode = NameServicePacket.QUERY;