// This test verifies that when the system property is null, the handler
        // falls back to using default handlers without throwing NullPointerException.
        System.clearProperty("java.protocol.handler.pkgs");
        setupMockProtocolHandlers();
        URL url = new URL("http://example.com/resource");

        URLConnection connection = handler.openConnection(url);

        assertEquals("-X777", values[4]);
        assertEquals("-X999", values[5]);
    }

    @Test
    public void test_getJavaVersion_edgeCases() {
        // Test with null java.version property
        System.clearProperty("java.version");
        assertEquals(8, JvmUtil.getJavaVersion());

        // Test with empty string
        System.setProperty("java.version", "");
        try {
            JvmUtil.getJavaVersion();

        } finally {
            if (originalValue != null) {
                System.setProperty(FesenClient.HTTP_ADDRESS, originalValue);
            } else {
                System.clearProperty(FesenClient.HTTP_ADDRESS);
            }
        }
    }

    // Test destroy container
    @Test
    public void test_destroyContainer() {

  }

  @AfterEach
  fun tearDown() {
    java.net.Authenticator.setDefault(null)
    System.clearProperty("proxyHost")
    System.clearProperty("proxyPort")
    System.clearProperty("http.proxyHost")
    System.clearProperty("http.proxyPort")
    System.clearProperty("https.proxyHost")
    System.clearProperty("https.proxyPort")
    if (cache != null) {
      cache!!.delete()
    }
  }

  @Test

        try {
            System.setProperty("fess.log.path", "logpath");
            assertEquals("logpath", systemHelper.getLogFilePath());
        } finally {
            System.clearProperty("fess.log.path");
        }
    }

    @Test
    public void test_getForumLink() {
        getMockRequest().setLocale(Locale.ENGLISH);