public void testValidateInputStream(final InputStream in) {
            validateInputStream(in);
        }
    }

    private TestExtractor extractor;

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        extractor = new TestExtractor();
    }

    /**
     * Test that validateInputStream accepts non-null input streams.
     */

**Key Test Areas**:
- Resource closure on successful extraction (MS Office extractors)
- Resource closure on failed extraction
- Improved error messages with context
- Input validation using `validateInputStream()`

**Covered Extractors**:
- MsWordExtractor
- MsExcelExtractor
- MsPowerPointExtractor
- TextExtractor

**Test Count**: 8 tests

**Key Scenarios**:

     * @throws ExtractException if an unexpected error occurs during extraction
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);
        try {
            final String content = params != null ? params.getOrDefault(ExtractData.RESOURCE_NAME_KEY, StringUtil.EMPTY) : StringUtil.EMPTY;
            return new ExtractData(content);

     * @param params The parameters.
     * @return The extracted data.
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);
        try (final HSLFSlideShow slideShow = new HSLFSlideShow(in);
                final SlideShowExtractor<HSLFShape, HSLFTextParagraph> extractor = new SlideShowExtractor<>(slideShow)) {

     */
    public TextExtractor() {
        super();
    }

    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);
        try {
            final String content = new String(InputStreamUtil.getBytes(in), getEncoding());
            return new ExtractData(content);
        } catch (final Exception e) {

     * @param params The parameters.
     * @return The extracted data.
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);
        try (final HSSFWorkbook workbook = new HSSFWorkbook(in);
                final org.apache.poi.hssf.extractor.ExcelExtractor excelExtractor =

     * @param params The parameters.
     * @return The extracted data.
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);
        try (final org.apache.poi.hwpf.extractor.WordExtractor wordExtractor = new org.apache.poi.hwpf.extractor.WordExtractor(in)) {
            return new ExtractData(wordExtractor.getText());

     */
    public ZipExtractor() {
        super();
    }

    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);

        final MimeTypeHelper mimeTypeHelper = getMimeTypeHelper();
        final ExtractorFactory extractorFactory = getExtractorFactory();
        final StringBuilder buf = new StringBuilder(1000);

     */
    public TarExtractor() {
        super();
    }

    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);

        final MimeTypeHelper mimeTypeHelper = getMimeTypeHelper();
        final ExtractorFactory extractorFactory = getExtractorFactory();

     * This is a common validation performed by most extractors.
     *
     * @param in The input stream to validate
     * @throws CrawlerSystemException if the input stream is null
     */
    protected void validateInputStream(final InputStream in) {
        if (in == null) {
            throw new CrawlerSystemException("The inputstream is null.");
        }
    }