buf.enc_ndr_small(0);
        TestMessage msg = new TestMessage();
        assertThrows(NdrException.class, () -> msg.decode_header(buf));
    }

    @Test
    void testRoundTripEncodeDecodeForRequestType() throws Exception {
        TestMessage m = new TestMessage();
        m.ptype = 0; // Request type
        NdrBuffer buf = new NdrBuffer(new byte[1024], 0);
        m.encode(buf);