<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.dbflute.utflute</groupId>
			<artifactId>utflute-lasta-di</artifactId>
			<version>${utflute.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.mortbay.jetty</groupId>
			<artifactId>jetty</artifactId>
			<version>6.1.26</version>

			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.dbflute.utflute</groupId>
			<artifactId>utflute-lasta-di</artifactId>
			<version>${utflute.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.mockito</groupId>
			<artifactId>mockito-core</artifactId>

- License headers required

### Testing

**Structure**: `src/test/java/org/codelibs/fess/crawler/`
**Frameworks**: JUnit 4, UTFlute, Mockito, Testcontainers
**Test Resources**: `src/test/resources/`

**Pattern**:
```java
public class MyTest extends UTFlute {
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        // Setup
    }

			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.dbflute.utflute</groupId>
			<artifactId>utflute-core</artifactId>
			<version>${utflute.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.mortbay.jetty</groupId>
			<artifactId>jetty</artifactId>

import org.codelibs.fess.crawler.container.StandardCrawlerContainer;
import org.codelibs.fess.crawler.entity.ExtractData;
import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test class for JsonExtractor.
 */
public class JsonExtractorTest extends PlainTestCase {
    private static final Logger logger = LogManager.getLogger(JsonExtractorTest.class);

import java.util.Map;

import org.codelibs.fess.crawler.container.StandardCrawlerContainer;
import org.codelibs.fess.crawler.entity.ExtractData;
import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Enhanced test class for FilenameExtractor covering edge cases and new functionality.
 */
public class FilenameExtractorEnhancedTest extends PlainTestCase {

import org.codelibs.fess.crawler.container.StandardCrawlerContainer;
import org.codelibs.fess.crawler.entity.ExtractData;
import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test class for CsvExtractor.
 */
public class CsvExtractorTest extends PlainTestCase {
    private static final Logger logger = LogManager.getLogger(CsvExtractorTest.class);

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Map;

import org.codelibs.fess.crawler.entity.ExtractData;
import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test class for AbstractExtractor base functionality.
 * Focuses on testing the validateInputStream() method and other common functionality.
 */

import org.codelibs.fess.crawler.entity.ExtractData;
import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.codelibs.fess.crawler.exception.ExtractException;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Enhanced test class for TextExtractor covering improved error messages and edge cases.
 */
public class TextExtractorEnhancedTest extends PlainTestCase {

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.crawler.entity;

import java.util.Set;

import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test class for {@link ExtractData}.
 */
public class ExtractDataTest extends PlainTestCase {

    public void test_defaultConstructor() {
        // Test default constructor