- 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
- ✅ Error messages include file type context

---

### 2. FilenameExtractorEnhancedTest.java
**Purpose**: Test FilenameExtractor edge cases and new documentation.

        assertNotNull(result.getContent());
        assertTrue("Should contain test content", result.getContent().contains("テスト"));
    }

    /**
     * Test that error message format is consistent and descriptive.
     */
    public void test_errorMessage_formatIsDescriptive() {
        final InputStream errorStream = new InputStream() {
            @Override
            public int read() throws IOException {

        } catch (final CrawlerSystemException e) {
            assertEquals("The inputstream is null.", e.getMessage());
        }
    }

    /**
     * Test that ZipExtractor provides descriptive error message for invalid archive.
     */
    public void test_ZipExtractor_invalidArchive_throwsWithDescriptiveMessage() {
        final InputStream invalidStream = new ByteArrayInputStream("not a valid zip file".getBytes());

    }

    /**
     * Gets the description of the video.
     * @return the description
     */
    public String getDescription() {
        return description;
    }

    /**
     * Sets the description of the video.
     * @param description the description to set
     */
    public void setDescription(final String description) {
        this.description = description;
    }

    /**

                                        <label for="description" class="col-sm-2 text-sm-right col-form-label"><la:message
                                                key="labels.description"/></label>
                                        <div class="col-sm-10">
                                            <la:text styleId="description" property="description"
                                                     styleClass="form-control"/>

                                        <label for="description" class="col-sm-2 text-sm-right col-form-label"><la:message
                                                key="labels.description"/></label>
                                        <div class="col-sm-10">
                                            <la:text styleId="description" property="description"
                                                     styleClass="form-control"/>

      ],
      "allowedVersions": "<10.0",
      "description": "JDK 11 requirement"
    },
    {
      "extends": [
        "monorepo:junit5"
      ],
      "allowedVersions": "<5.14.0",
    },
    {
      "matchPackageNames": [
        "org.junit-pioneer:junit-pioneer"
      ],
      "allowedVersions": "<2.0.0",
      "description": "JDK 11 requirement"
    }
  ]

                                        <label for="description" class="col-sm-2 text-sm-right col-form-label"><la:message
                                                key="labels.description"/></label>
                                        <div class="col-sm-10">
                                            <la:text styleId="description" property="description"
                                                     styleClass="form-control"/>

                                            key="labels.description"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="description"/>
                                        <la:textarea styleId="description" property="description"
                                                     styleClass="form-control"

                                    <tr>
                                        <th><la:message key="labels.description"/></th>
                                        <td>${f:br(f:h(description))}<la:hidden
                                                property="description"/></td>
                                    </tr>
                                    </tbody>
                                </table>