The test uses this code to create a list of valid adresses for the localhost:

        String hostname = "localhost";
        List<String> validAddresses = new LinkedList<>();
        validAddresses.add(hostname);
        Arrays.stream(InetAddress.getAllByName(hostname))
                    .forEach(address -> validAddresses.add(address.getHostAddress()));

It does not work properly if the custom name is set for the 127.0.01 via /etc/hosts file. In that case the correct address will be "SomeCustomName:port".

Additionally to the "localhost", the test should validate the name returned by the InetAddress.getLocalHost().getHostName().