assertSame(data, blob.get(), "get() should expose the same array reference passed in");
        assertEquals(data.length, blob.length(), "length() should match underlying array length");
        assertEquals("deadbeef", blob.toString(), "toString() should reflect underlying content");
        assertEquals(data.hashCode(), blob.hashCode(), "hashCode should equal the array's hashCode");
    }

    }

    @Test
    @DisplayName("Unknown DOS error code yields empty Optional")
    void testUnknownCode() {
        Optional<Integer> noMatch = findNtStatus(0xdeadbeef);
        assertFalse(noMatch.isPresent(), "Mapping for unknown code should be absent");
    }

    @Test
    @DisplayName("Mocked consumer receives correct NTSTATUS value")
    void testConsumerInteraction() {

                // An error that maps via DOS mapping
                Arguments.of(0x00000002, SmbException.getMessageByCode(0x00000002)),
                // Unknown code → hex string (uppercase)
                Arguments.of(0xDEADBEEF, "0xDEADBEEF"));
    }

    @ParameterizedTest
    @MethodSource("errorCodes")
    void constructorInitialisesMessageAndStatus(int code, String expectedMsg) {
        SmbAuthException e = new SmbAuthException(code);

        buf.enc_ndr_short(0); // context_id
        buf.enc_ndr_short(0); // cancel_count
        buf.enc_ndr_long(0xDEADBEEF); // fault status

        // Decode
        buf.setIndex(0);
        TestMessage m = new TestMessage();
        m.decode(buf);

        assertEquals(3, m.ptype);
        assertEquals(0xDEADBEEF, m.result);
        assertNotNull(m.getResult());
    }

    @Test