byte[] buf = new byte[256];
        int len = invokeProtectedInt(obj, "writeParameterWordsWireFormat", buf, 0);

        // Expected size: 2 (sendBuffer) + 2 (mpxCount) + 2 (vcNumber) + 4 (sessionKey) + 2 (blob length) + 4 (reserved) + 4 (capabilities)
        int expected = 2 + 2 + 2 + 4 + 2 + 4 + 4;
        assertEquals(expected, len);

        int off = 0;