private static String joinLines(String... lines) {
        String nl = System.getProperty("line.separator"); // in case of \r\n instead of just \n...
        return String.join(nl, lines) + nl;
    }
Test the parameters that could not be used in conjunction with
those in the first parameter test.
vespaclient-java/src/test/java/com/yahoo/vespavisit/VdsVisitTestCase.java