void testConstants() {
        assertEquals(0x00, SessionServicePacket.SESSION_MESSAGE);
        assertEquals(0x81, SessionServicePacket.SESSION_REQUEST);
        assertEquals(0x82, SessionServicePacket.POSITIVE_SESSION_RESPONSE);
        assertEquals(0x83, SessionServicePacket.NEGATIVE_SESSION_RESPONSE);
        assertEquals(0x84, SessionServicePacket.SESSION_RETARGET_RESPONSE);

     * - Byte 1: High bit of 17-bit length field
     * - Bytes 2-3: Lower 16 bits of length field
     */
    private static byte[] messageHeader(int length) {
        byte[] h = new byte[4];
        h[0] = (byte) SessionServicePacket.SESSION_MESSAGE;
        h[1] = (byte) ((length >> 16) & 0x01);
        h[2] = (byte) ((length >> 8) & 0xFF);
        h[3] = (byte) (length & 0xFF);
        return h;
    }

    /**

            }
            switch (sbuf[0] & 0xFF) {
            case SessionServicePacket.POSITIVE_SESSION_RESPONSE:
                if (LogStream.level >= 4) {
                    log.println("session established ok with " + address);
                }
                return;
            case SessionServicePacket.NEGATIVE_SESSION_RESPONSE:
                final int errorCode = in.read() & 0xFF;

        SessionRequestPacket packet = new SessionRequestPacket(mockConfig, mockCalledName, mockCallingName);

        assertNotNull(packet);
        assertEquals(SessionServicePacket.SESSION_REQUEST, packet.type);
    }

    @Test
    @DisplayName("writeTrailerWireFormat should write both names correctly")
    void testWriteTrailerWireFormat() {