code: public static ServerPort is(final int... ports)
     {
        return new ServerPort(ports) {
           @Override
           public String toString()
           {
              return "ServerPort.is(" + Strings.join(Arrays.asList(ports), ", ") + ")";
           }
        };
     }
docs: Create a {@link Condition} to assert that the current {@link Address#getPort()} matches any of the given ports.