}

    @Test
    @DisplayName("Structure: DOS_ERROR_CODES is non-null with [code,status] pairs")
    void dosErrorCodesStructureIsValid() {
        // Arrange & Act
        int[][] table = DosError.DOS_ERROR_CODES;

        // Assert
        assertNotNull(table, "DOS_ERROR_CODES must not be null");
        assertTrue(table.length > 0, "DOS_ERROR_CODES must not be empty");
        for (int i = 0; i < table.length; i++) {

    /**
     * Parameterised test covering many error codes.
     * - Error code 0 returns 0 (NT_STATUS_SUCCESS)
     * - Negative values with 0xC0000000 bits set are returned as-is
     * - Positive values not in DOS_ERROR_CODES map to NT_STATUS_UNSUCCESSFUL
     */
    @ParameterizedTest
    @ValueSource(ints = { 0, 1, 123, -7 })
    void testGetNtStatusVariousCodes(int errcode) {
        SmbException ex = new SmbException(errcode, false);

 */
public interface DosError {

    /**
     * Mapping table from DOS error codes to NT status codes.
     * Each entry contains a pair of [DOS error code, NT status code].
     */
    int[][] DOS_ERROR_CODES =
            { { 0x00000000, 0x00000000 }, { 0x00010001, 0xc0000002 }, { 0x00010002, 0xc0000002 }, { 0x00020001, 0xc000000f },

 */
public interface DosError {

    /**
     * Mapping table from DOS error codes to NT status codes.
     * Each entry contains a pair of [DOS error code, NT status code].
     */
    int[][] DOS_ERROR_CODES = { { 0x00000000, 0x00000000 }, { 0x00010001, 0xc0000002 }, { 0x00010002, 0xc0000002 },
            { 0x00020001, 0xc000000f }, { 0x00020002, 0xc000006a }, { 0x00030001, 0xc000003a }, { 0x00030002, 0xc00000cb },

    }

    @Test
    @DisplayName("Should handle DOS error codes")
    void testDOSErrorCodes() {
        // Given
        int dosError = 0x00020002; // File not found from DOS_ERROR_CODES

        // When
        SmbException exception = new SmbException(dosError, false);

        // Then
        assertNotNull(exception);
        assertNotNull(exception.getMessage());

            errorCodeMessagesTmp.put(NT_STATUS_CODES[i], NT_STATUS_MESSAGES[i]);
        }

        final Map<Integer, Integer> dosErrorCodeStatusesTmp = new HashMap<>();
        for (final int[] element : DOS_ERROR_CODES) {
            dosErrorCodeStatusesTmp.put(element[0], element[1]);
            final int mappedNtCode = element[1];
            final String mappedNtMessage = errorCodeMessagesTmp.get(mappedNtCode);