```bash
# Run unit tests (*Test.java)
mvn test

# Run single unit test
mvn test -Dtest=SearchEngineClientTest

# Run integration tests (*Tests.java in src/test/java/org/codelibs/fess/it/)
# Requires Fess server and OpenSearch running
mvn test -P integrationTests -Dtest.fess.url="http://localhost:8080" -Dtest.search_engine.url="http://localhost:9201"

# Run single integration test

        // Set content
        String content = "This is a long extracted content from a PDF document. " + "It contains multiple paragraphs and rich text.";
        data.setContent(content);

        // Add single values
        data.putValue(ExtractData.RESOURCE_NAME_KEY, "document.pdf");
        data.putValue(ExtractData.URL, "https://example.com/docs/document.pdf");
        data.putValue("title", "Important Document");

        for (int i = 0; i < binaryData.length; i++) {
            assertEquals("Binary data should match at position " + i, binaryData[i], binaryDecoded[i]);
        }
    }

    /**
     * Test encode with single byte
     *
     * @throws Exception
     */
    public void testEncode_SingleByte() throws Exception {
        final byte[] singleByte = new byte[] { 'A' };

 * <li>{@link #SuggestIndexer(Client, String, ReadingConverter, ReadingConverter, Normalizer, SuggestAnalyzer, SuggestSettings, ExecutorService)}
 * </ul>
 *
 * <p>Methods:
 * <ul>
 * <li>{@link #index(SuggestItem)} - Index a single suggest item.
 * <li>{@link #index(SuggestItem[])} - Index multiple suggest items.
 * <li>{@link #delete(String)} - Delete a suggest item by ID.
 * <li>{@link #deleteByQuery(String)} - Delete suggest items by query string.

        assertNotNull(emptyKeywords);
        assertEquals(0, emptyKeywords.length);

        // Test single word query
        String[] singleKeyword = SuggestUtil.parseQuery("single", field);
        assertNotNull(singleKeyword);
        assertEquals(1, singleKeyword.length);
        assertEquals("single", singleKeyword[0]);
    }

    @Test
    public void testParseQueryWithTooManyTerms() {

        }
        return new DefaultQueryBuilder(boolQuery);
    }

    /**
     * Builds a match phrase query, with special handling for single CJK characters.
     * For single CJK characters in title or content fields, uses prefix query instead.
     * @param f The field name.
     * @param text The text to search for.
     * @return The appropriate query builder.
     */

        runner = new OpenSearchRunner();
        runner.onBuild((number, settingsBuilder) -> {
            settingsBuilder.put("http.cors.enabled", true);
            settingsBuilder.put("discovery.type", "single-node");
        })
                .build(newConfigs().clusterName("ESSourceReaderTest")
                        .numOfNode(1)
                        .pluginTypes("org.codelibs.opensearch.extension.ExtensionPlugin"));

        runner = new OpenSearchRunner();
        runner.onBuild((number, settingsBuilder) -> {
            settingsBuilder.put("http.cors.enabled", true);
            settingsBuilder.put("discovery.type", "single-node");
        })
                .build(newConfigs().clusterName("PopularWordsRequestBuilderTest")
                        .numOfNode(1)

        runner = new OpenSearchRunner();
        runner.onBuild((number, settingsBuilder) -> {
            settingsBuilder.put("http.cors.enabled", true);
            settingsBuilder.put("discovery.type", "single-node");
        })
                .build(newConfigs().clusterName("AnalyzerNormalizerTest")
                        .numOfNode(1)
                        .pluginTypes("org.codelibs.opensearch.extension.ExtensionPlugin"));

        runner = new OpenSearchRunner();
        runner.onBuild((number, settingsBuilder) -> {
            settingsBuilder.put("http.cors.enabled", true);
            settingsBuilder.put("discovery.type", "single-node");
        })
                .build(newConfigs().clusterName("ArraySettingsTest")
                        .numOfNode(1)
                        .pluginTypes("org.codelibs.opensearch.extension.ExtensionPlugin"));