void testGetInstanceWithoutSetInstance() {
        // Test getInstance when no instance has been set
        // Should default to System.err
        LogStream instance = LogStream.getInstance();
        assertNotNull(instance);

        // Getting instance again should return the same instance
        LogStream instance2 = LogStream.getInstance();
        assertSame(instance, instance2);
    }

    @Test

    // Use reflection to reset the singleton instance between tests
    @BeforeEach
    @AfterEach
    void resetSingleton() {
        try {
            Field instance = SingletonContext.class.getDeclaredField("INSTANCE");
            instance.setAccessible(true);
            instance.set(null, null);
        } catch (NoSuchFieldException | IllegalAccessException e) {

     * <p>
     * If a root package is specified at instance construction, the specified class name is interpreted as a relative name from the root package.
     * </p>
     *
     * @param className the class name
     * @return <code>true</code> if the class file exists in the resources handled by this instance
     */
    boolean isExistClass(final String className);

	<component name="crawler" class="org.codelibs.fess.crawler.Crawler" instance="prototype" >
	</component>

	<!-- Crawler Thread -->
	<component name="crawlerThread" class="org.codelibs.fess.crawler.CrawlerThread" instance="prototype" >
	</component>

	<!-- Entity -->
	<component name="accessResult" class="org.codelibs.fess.crawler.entity.AccessResultImpl" instance="prototype" >
	</component>

     * @param index The index name.
     * @return This builder instance.
     */
    public SuggestRequestBuilder setIndex(final String index) {
        request.setIndex(index);
        return this;
    }

    /**
     * Sets the size of results for the request.
     * @param size The size.
     * @return This builder instance.
     */
    public SuggestRequestBuilder setSize(final int size) {

        byte[] buffer = new byte[] { (byte) 0xff, (byte) 0xff, 0, 0, 0, 0, 0, 0 };
        SmbComWriteAndXResponse instance = new SmbComWriteAndXResponse(config);

        // When
        int result = instance.readParameterWordsWireFormat(buffer, 0);

        // Then
        assertEquals(8, result);
        assertEquals(0xffffL, instance.getCount());
    }

    /**
     * Test of readParameterWordsWireFormat with zero count
     */

     * @return This builder instance.
     */
    public SuggestSettingsBuilder clusterTimeout(final String timeout) {
        timeoutSettings.setClusterTimeout(timeout);
        return this;
    }

    /**
     * Builds a SuggestSettings instance.
     * @param client The OpenSearch client.
     * @param id The ID.
     * @return A SuggestSettings instance.
     */

     * @param index The index name.
     * @return This builder instance.
     */
    public PopularWordsRequestBuilder setIndex(final String index) {
        request.setIndex(index);
        return this;
    }

    /**
     * Sets the size of results for the request.
     * @param size The size.
     * @return This builder instance.
     */
    public PopularWordsRequestBuilder setSize(final int size) {

		<property name="charset">"UTF-8"</property>
	</component>

	<component name="storageClient"
		class="org.codelibs.fess.crawler.client.storage.StorageClient" instance="prototype">
		<property name="charset">"UTF-8"</property>
	</component>

	<component name="s3Client"
		class="org.codelibs.fess.crawler.client.s3.S3Client" instance="prototype">

   * intern(a)} is permitted to return one instance now and a different instance later if the
   * original interned instance was garbage-collected.
   *
   * <p><b>Warning:</b> do not use with mutable objects.
   *
   * @throws NullPointerException if {@code sample} is null
   */
  E intern(E sample);