code: protected String getStringArg(int index, String defaultValue) {
          String result = defaultValue;
          String[] arg = getArgs();
          if (arg != null) {
              if (arg.length > index) {
                  result = arg[index];
              }
          }
          return result;
      }
docs: Gets fixture parameter (i.e. extra column in header row).
  Please note this can not be called from a constructor, as the parameters will not have been initialized yet!
  @param index index (zero based) to get value from.
  @param defaultValue value to use if parameter is not present.
  @return parameter value, if present, defaultValue otherwise.