docs: def get_assessment_ids(self):
          """Gets the Ids of any assessments associated with this activity.
  
          return: (osid.id.IdList) - list of assessment Ids
          raise:  IllegalState - is_assessment_based_activity() is false
          compliance: mandatory - This method must be implemented.
  
          """
          if not self.is_assessment_based_activity():
              raise IllegalState()
          else:
              return [Id(a) for a in self._my_map['assessmentIds']]