String host = "www.codelibs.org";
        String expected = "www.codelibs.org";
        assertEquals(expected, resolver.toAscii(host));

        host = "テスト.org";
        expected = "xn--zckzah.org";
        assertEquals(expected, resolver.toAscii(host));

        host = "xn--zckzah.org";
        expected = "xn--zckzah.org";
        assertEquals(expected, resolver.toAscii(host));

        cache.close(); // This deletes the file

        try {
            cache.getInputStream();
            fail("Expected IOException for deleted file");
        } catch (IOException e) {
            // Expected - file no longer exists
        }
    }

    @Test
    public void testFileBasedCacheCloseNonExistentFile() {

        try {
            extractor.getText(null, null);
            fail("Expected CrawlerSystemException");
        } catch (final CrawlerSystemException e) {
            assertEquals("The inputstream is null.", e.getMessage());
            // Note: validateCalled will be false because exception is thrown
            // before the flag can be set, which is the expected behavior

        final long start = System.nanoTime();
        controller.delayAfterProcessing();
        final long elapsed = (System.nanoTime() - start) / 1000000;

        assertTrue("No delay expected", elapsed < 50); // Should be nearly instant
    }

    /**
     * Test delayAfterProcessing with actual delay
     */
    public void test_delayAfterProcessing_withDelay() {

     */
    @Test
    public void testReadBytes_NullFile() {
        try {
            FileUtil.readBytes(null);
            fail("Expected IllegalArgumentException");
        } catch (final IllegalArgumentException e) {
            // Expected
        }
    }

    /**
     * Test isPathSafe with null path throws exception
     */
    @Test
    public void testIsPathSafe_NullPath() {

        // Should throw CrawlerSystemException
        try {
            controller.delay(IntervalController.PRE_PROCESSING);
            fail("Expected CrawlerSystemException to be thrown");
        } catch (final CrawlerSystemException e) {
            // Expected
            assertTrue(e.getMessage().contains("Could not stop a process"));
        }
    }

    /**

        CloseableUtil.closeQuietly(in);

        final String content = extractData.getContent();
        logger.info(content);

        // Verify content contains expected fields
        assertTrue(content.contains("title"));
        assertTrue(content.contains("Sample Document"));
        assertTrue(content.contains("author"));
        assertTrue(content.contains("John Doe"));

            new ICUNormalizer(null);
            fail("Expected IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            assertEquals("transliteratorId must not be null", e.getMessage());
        }
    }

    public void test_invalidTransliteratorId() {
        try {
            new ICUNormalizer("Invalid-Transliterator-ID-12345");
            fail("Expected IllegalArgumentException");

    }

    @Test
    public void testGetContentAsStringWithoutCache() {
        CurlResponse response = new CurlResponse();

        try {
            response.getContentAsString();
            fail("Expected CurlException");
        } catch (CurlException e) {
            assertTrue(e.getMessage().contains("Failed to access the content"));
        }
    }

    @Test

        }
        String text = sb.toString();
        String id = SuggestUtil.createSuggestTextId(text);
        assertNotNull(id);
        String expected = Base64.getEncoder().encodeToString(text.getBytes(CoreLibConstants.CHARSET_UTF_8));
        assertEquals(expected, id); // Should not be truncated
    }

    @Test
    public void testCreateSuggestTextIdWithUnicodeCharacters() {