public MsPowerPointExtractor msPowerPointExtractor;

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        StandardCrawlerContainer container = new StandardCrawlerContainer().singleton("msPowerPointExtractor", MsPowerPointExtractor.class);
        msPowerPointExtractor = container.getComponent("msPowerPointExtractor");
    }

    public void test_getText() {

- 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**:
- ✅ Successful extraction closes resources properly
- ✅ Failed extraction includes descriptive error messages
- ✅ Null input stream validation