assertThat(HostAndPort.fromString("x").requireBracketsForIPv6().getHost()).isEqualTo("x");
    assertThat(HostAndPort.fromString("x:80").requireBracketsForIPv6().getHost()).isEqualTo("x");

    // Non-bracketed IPv6 fails.
    assertThrows(
        IllegalArgumentException.class,
        () -> HostAndPort.fromString("::1").requireBracketsForIPv6());
  }

  public void testToString() {
    // With ports.

 * and access mask are considered. If the ACE is a "deny"
 * ACE and <i>any</i> of the desired access bits match bits in the access
 * mask of the ACE, the whole access check fails. If the ACE is an "allow"
 * ACE and <i>all</i> of the bits in the desired access bits match bits in
 * the access mask of the ACE, the access check is successful. Otherwise,

     * with the appropriate SPNEGO settings and marks initialization as complete.
     *
     * @return The configured SPNEGO authenticator instance
     * @throws SsoLoginException if SPNEGO initialization fails
     */
    protected synchronized org.codelibs.spnego.SpnegoAuthenticator getAuthenticator() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

     *             If the underlying constructor represents an abstract class
     * @throws IllegalAccessRuntimeException
     *             If the number of actual and formal parameters differ, if unwrapping of primitive arguments fails,
     *             or if after unwrapping, the parameter values cannot be converted to the corresponding formal parameter types,
     *             or if the constructor is related to an enum type

     * The stack trace is abbreviated if it exceeds the configured maximum length.
     *
     * @param t the throwable to extract the stack trace from
     * @return the stack trace as a string, or empty string if extraction fails
     */
    private String getStackTrace(final Throwable t) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

     * @param data the raw PAC data bytes
     * @param keys map of Kerberos keys for signature validation
     * @throws PACDecodingException if the PAC data is malformed or signature validation fails
     */
    public Pac(byte[] data, Map<Integer, KerberosKey> keys) throws PACDecodingException {
        byte[] checksumData = data.clone();
        try {

     * Sets up the command list, working directory, and environment variables,
     * then starts the Python process and waits for completion.
     *
     * @throws JobProcessingException if the Python script execution fails
     */
    protected void executePython() {
        final List<String> cmdList = new ArrayList<>();
        final ServletContext servletContext = ComponentUtil.getComponent(ServletContext.class);

            // Single zero should not be compressed
            assertEquals("2001:db8:1:0:2:3:4:5", method.invoke(null, "2001:0db8:1:0:2:3:4:5"));
        } catch (Exception e) {
            // If reflection fails, skip this test
        }
    }

    @Test
    public void testIsIPv6Address() {
        // IPv6 addresses
        assertTrue(IpAddressUtil.isIPv6Address("::1"));

    initCollectionWithNullElement();
    expectReturnsTrue(disjoint);
    expectContents();
  }

  // retainAll(null)

  /*
   * AbstractCollection fails the retainAll(null) test when the subject
   * collection is empty, but we'd still like to test retainAll(null) when we
   * can. We split the test into empty and non-empty cases. This allows us to
   * suppress only the former.

     * @param builder The XContentBuilder to write to.
     * @param params Additional parameters for the conversion.
     * @return The XContentBuilder with the access result data.
     * @throws IOException if the conversion fails.
     */
    @Override
    public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
        builder.startObject();
        if (sessionId != null) {