code: public static Properties getProperties(ArgumentUnit argumentUnit)
              throws IllegalArgumentException
      {
          if (argumentUnit == null) {
              throw new IllegalArgumentException("argumentUnit is null");
          }
  
          return stringToProperties(argumentUnit.getProperties());
      }
docs: Extract properties from {@code properties} field of the given argument unit
  
  @param argumentUnit argument unit
  @return properties
  @throws IllegalArgumentException if argumentUnit is null