* negative so it with NT_STATUS_SUCCESS (0) the binary search will not be
         * performed properly. The effect is that the code at index 1 is never found
         * (NT_STATUS_UNSUCCESSFUL). So here we factor out NT_STATUS_SUCCESS
         * as a special case (which it is).
         */
        if (errcode == 0) {
            return "NT_STATUS_SUCCESS";
        }

    @Test
    @DisplayName("Should define well-known NT status constants")
    void testWellKnownStatusConstants() {
        // Verify important NT status constants are defined
        assertEquals(0x00000000, NtStatus.NT_STATUS_SUCCESS);
        assertEquals((int) 0xC0000022L, NtStatus.NT_STATUS_ACCESS_DENIED);
        assertEquals((int) 0xC0000034L, NtStatus.NT_STATUS_OBJECT_NAME_NOT_FOUND);

    @Test
    @DisplayName("Constructor 0 – NT_STATUS_SUCCESS")
    void testConstructorWithZeroCode() {
        SmbException ex = new SmbException(0, false);
        assertEquals("NT_STATUS_SUCCESS", ex.getMessage());
        assertEquals(0, ex.getNtStatus());
        assertNull(ex.getRootCause(), "root cause should be null for this ctor");
        assertEquals("jcifs.smb1.smb1.SmbException: NT_STATUS_SUCCESS", ex.toString());
    }

    /**

     */
    static Stream<Arguments> intErrorCodes() {
        return Stream.of(Arguments.of(NtStatus.NT_STATUS_ACCESS_DENIED, NtStatus.NT_STATUS_ACCESS_DENIED),
                Arguments.of(NtStatus.NT_STATUS_SUCCESS, NtStatus.NT_STATUS_SUCCESS),
                Arguments.of(0x00001234, NtStatus.NT_STATUS_UNSUCCESSFUL));
    }

    @ParameterizedTest
    @MethodSource("intErrorCodes")

        Smb2SessionSetupResponse resp = newResponse();

        byte[] buf = new byte[256];
        int headerStart = 0;
        buildHeader(buf, headerStart, NtStatus.NT_STATUS_SUCCESS, 0x0001, 0xCAFEBABECAFEF00DL);

        int bodyStart = headerStart + Smb2Constants.SMB2_HEADER_LENGTH;
        byte[] blob = new byte[] { 1, 2, 3 };
        int secBufOffset = Smb2Constants.SMB2_HEADER_LENGTH + 8;

                // Known NT status code - NT_STATUS_UNSUCCESSFUL
                Arguments.of(0xC0000001, "A device attached to the system is not functioning."),
                Arguments.of(0x00000000, "NT_STATUS_SUCCESS"),
                // An error that maps via DOS mapping
                Arguments.of(0x00000002, SmbException.getMessageByCode(0x00000002)),
                // Unknown code → hex string (uppercase)

        assertTrue(ex instanceof SmbException, "Should be an SmbException subtype");
        // SmbException default ctor leaves status 0, which equals NT_STATUS_SUCCESS
        assertEquals(NtStatus.NT_STATUS_SUCCESS, ex.getNtStatus(), "Default status should be success (0)");
    }

    // Edge/null/empty: message-only constructor should propagate message and set unsuccessful status
    @ParameterizedTest

            createResp = th.send(create);
        } catch (final SmbException e) {
            final Smb2CreateResponse cr = create.getResponse();
            if (cr != null && cr.isReceived() && cr.getStatus() == NtStatus.NT_STATUS_SUCCESS) {
                try {
                    th.send(new Smb2CloseRequest(th.getConfig(), cr.getFileId()));
                } catch (final SmbException e2) {
                    e.addSuppressed(e2);
                }

        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
        assertEquals(cause, exception.getCause());
    }

    @ParameterizedTest
    @ValueSource(ints = { NtStatus.NT_STATUS_SUCCESS, NtStatus.NT_STATUS_ACCESS_DENIED, NtStatus.NT_STATUS_OBJECT_NAME_NOT_FOUND,
            NtStatus.NT_STATUS_SHARING_VIOLATION, NtStatus.NT_STATUS_INVALID_PARAMETER })
    @DisplayName("Should handle various NT status codes")

            }
        }

        // for backward compatibility since this is was different message in the NtStatus.NT_STATUS_CODES than returned
        // by getMessageByCode
        errorCodeMessagesTmp.put(0, "NT_STATUS_SUCCESS");

        errorCodeMessages = Collections.unmodifiableMap(errorCodeMessagesTmp);
        dosErrorCodeStatuses = Collections.unmodifiableMap(dosErrorCodeStatusesTmp);