buf.enc_ndr_small(4); // bad major
        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);

     * Ensures that the exception is created with the correct message.
     */
    @Test
    void testConstructorWithMessage() {
        String testMessage = "This is a test message for NdrException.";
        NdrException exception = new NdrException(testMessage);
        assertEquals(testMessage, exception.getMessage(), "The exception message should match the input message.");
    }

    /**
     * Test the NO_NULL_REF static field.