code: public Collection<SecondaryWorkitem> secondaryWorkitems(
              SecondaryWorkitemFilter filter) {
          return get(SecondaryWorkitem.class, (filter != null) ? filter : new SecondaryWorkitemFilter());
      }
docs: Get secondary workitems (tasks and tests) filtered by the criteria
  specified in the passed in filter.
  
  @param filter Limit the items returned. If null, then all items returned.
  @return Collection of items as specified in the filter.