assertFalse(future.set(23));
    assertFalse(future.setException(new Exception("bar")));
    assertFalse(future.setFuture(SettableFuture.create()));
    // Check that the future has been set properly.
    assertTrue(future.isDone());
    assertFalse(future.isCancelled());
    assertEquals(42, (int) future.get());
  }

  public void testSetException() throws Exception {

        assertEquals("query:", Constants.FACET_QUERY_PREFIX);
    }

    @Test
    public void test_unicode_base64_encoding() {
        // Test that unicode strings are properly encoded/decoded
        String unicodeString = "日本語テスト";
        String encoded = BaseEncoding.base64().encode(unicodeString.getBytes(StandardCharsets.UTF_8));

    assertFalse(future.set(23));
    assertFalse(future.setException(new Exception("bar")));
    assertFalse(future.setFuture(SettableFuture.create()));
    // Check that the future has been set properly.
    assertTrue(future.isDone());
    assertFalse(future.isCancelled());
    assertEquals(42, (int) future.get());
  }

  public void testSetException() throws Exception {

        assertSame(firstCall, secondCall);
        assertEquals(type, firstCall);
    }

    @Test
    public void test_inheritanceFromFessSystemException() {
        // Test that InvalidAccessTokenException is properly inherited from FessSystemException
        String type = "SessionToken";
        String message = "Session expired";
        InvalidAccessTokenException exception = new InvalidAccessTokenException(type, message);

        assertNotNull(crawlerEngineClient);
    }

    // Test inheritance
    @Test
    public void test_inheritance() {
        // Test that CrawlerEngineClient is properly inherited
        assertTrue(crawlerEngineClient instanceof org.codelibs.fess.crawler.client.FesenClient);
    }

    // Test multiple instances
    @Test
    public void test_multipleInstances() {

        assertNotNull(causeStackTrace);
        assertTrue(causeStackTrace.length > 0);
    }

    @Test
    public void test_throwAndCatch() {
        // Test that the exception can be thrown and caught properly
        ServletException originalException = new ServletException("Throw test");

        try {
            throw new ServletRuntimeException(originalException);
        } catch (ServletRuntimeException caught) {

            TimeZone.setDefault(originalDefault);
        }
    }

    @Test
    public void test_processDBFluteSystem_unlocksAndLocks() {
        // This test verifies that the DBFluteSystem is properly unlocked and locked
        // during the process, though we can't directly test the lock state

        // When
        try {
            curtainBeforeHook.processDBFluteSystem();

        }
    }

    @Test
    public void test_scroll_callbackHandling() {
        // This test verifies the scroll method exists and handles callbacks properly
        // Note: In a real test environment, this would require proper SearchEngineClient setup
        // For now, we test that the method signature is correct and can be called

        AtomicInteger callbackCount = new AtomicInteger(0);

        monitorTarget.append(buf, "dateKey", supplier);
        String result = buf.toString();
        assertTrue(result.startsWith("\"dateKey\":\""));
        // Check that the date was converted to string and properly escaped
        assertTrue(result.contains("2021") || result.contains("Jan") || result.contains("1609459200000"));
    }

    // Test appendTimestamp method
    @Test
    public void test_appendTimestamp() {

    public void test_process_withPropertiesPath() throws Exception {
        // Test that properties path is properly handled
        // Create temporary properties file
        File propFile = File.createTempFile("test", ".properties");
        propFile.deleteOnExit();
        FileUtil.writeBytes(propFile.getAbsolutePath(), "test.property=value".getBytes());

        Crawler.Options options = new Crawler.Options();