src/main/java/org/fest/assertions/error/ShouldBeSorted.java
@SuppressWarnings("unchecked")
  private static List<?> groupAsList(Object group) {
    if (group.getClass().isArray()) {
      return wrap(group);
    } else if (group instanceof Collection<?>) {
      List<Object> asList = new ArrayList<Object>();
      asList.addAll(((Collection<Object>) group));
      return asList;
    }
    throw new IllegalArgumentException("Parameter should be an array or a collection but was " + group);
  }
@SuppressWarnings("unchecked")
  private static List<?> groupAsList(Object group) {
    if (group.getClass().isArray()) {
      return wrap(group);
    } else if (group instanceof Collection<?>) {
      List<Object> asList = new ArrayList<Object>();
      asList.addAll(((Collection<Object>) group));
      return asList;
    }
    throw new IllegalArgumentException("Parameter should be an array or a collection but was " + group);
  }
Convert the given group (which is either an array or a Collection) to a List.
@param group the group to convert
@return the corresponding List
@throws IllegalArgumentException if group can't be converted to a List