m.encode(buf);
        // decode back
        buf.setIndex(0);
        m.decode_header(buf);
        assertEquals(0, m.ptype);
    }

    @Test
    void testDecodeHeaderInvalidVersion() {
        NdrBuffer buf = new NdrBuffer(new byte[10], 0);
        buf.enc_ndr_small(4); // bad major
        buf.enc_ndr_small(0);
        TestMessage msg = new TestMessage();