assertTrue(CharUtil.isUrlChar('9')); // last digit

        // Test characters just outside ranges that are not valid
        assertFalse(CharUtil.isUrlChar('`')); // backtick (just before 'a')
        assertFalse(CharUtil.isUrlChar('{')); // left brace (just after 'z')
        assertFalse(CharUtil.isUrlChar('^')); // caret (before 'a' range)

        assertEquals(0, controller.noUrlInQueueCount);
        assertEquals(1, controller.waitNewUrlCount);
    }

    /**
     * Test unknown delay type (should not throw exception, just log)
     */
    public void test_delay_unknownType() {
        final TestIntervalController controller = new TestIntervalController();
        controller.delay(999); // Unknown type

# new generation
if [ "x$FESS_HEAP_NEWSIZE" != "x" ]; then
    FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Xmn${FESS_HEAP_NEWSIZE}"
fi

# set to headless, just in case
FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Djava.awt.headless=true"

# maximum # keep-alive connections to maintain at once
FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dhttp.maxConnections=20"

# Force the JVM to use IPv4 stack

)

REM max direct memory
if NOT "%FESS_DIRECT_SIZE%" == "" (
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -XX:MaxDirectMemorySize=%FESS_DIRECT_SIZE%
)

REM set to headless, just in case
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Djava.awt.headless=true

REM maximum # keep-alive connections to maintain at once
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dhttp.maxConnections=20

        stream.close();

        // Note: FileUtil.deleteInBackground() performs deletion asynchronously,
        // so we cannot reliably check if file is deleted immediately
        // This test just verifies that close() completes without error
    }

    public void test_emptyFile() throws Exception {
        // Create an empty temporary file
        File tempFile = File.createTempFile("test-empty-", ".tmp");

                    }
                }
                textBuilder.append(lineSeparator);
            } else {
                // No headers, just concatenate values
                textBuilder.append(String.join(fieldSeparator, row)).append(lineSeparator);
            }
        }

        // Should be exactly 445 or less
        assertTrue(id.length() <= 445);
    }

    @Test
    public void testCreateSuggestTextIdBoundaryJustUnder445() {
        // Create text that encodes to just under 445 characters
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 300; i++) {
            sb.append("b");
        }
        String text = sb.toString();

        List<AnalyzeToken> tokens = defaultContentsParser.analyzeTextByReading(analyzer, "content", text, null);

        assertNotNull(tokens);
        // analyzeAndReading may return null for some analyzers
        // Just verify it doesn't throw an exception
    }

    @Test
    public void test_analyzeTextWithLargeContent() throws Exception {
        SuggestAnalyzer analyzer = suggester.settings().analyzer().new DefaultContentsAnalyzer();

     *
     * @return the logger instance
     */
    Logger getLogger();

    /**
     * Extracts the host name from a URL string.
     * Removes protocol and path components to return just the hostname.
     *
     * @param u the URL string to extract host from
     * @return the host name, or empty string if URL is blank, or unknown hostname if parsing fails
     */
    default String getHost(final String u) {

        method.setAccessible(true);
        method.invoke(crawlerThread, urlQueue, responseData);

        // Should not throw exception, just log
    }

    /**
     * Test run method with no URLs in queue.
     */
    public void test_run_noUrlsInQueue() throws Exception {
        when(urlQueueService.poll(anyString())).thenReturn(null);