public void GolfClubAggregate_CreateGolfClubAdministratorSecurityUser_AdminSecurityUserAlreadyCreated_ErrorThrown() { GolfClubAggregate aggregate = GolfClubTestData.GetCreatedGolfClubAggregateWithGolfClubAdministratorUser(); Should.Throw <InvalidOperationException>(() => { aggregate.CreateGolfClubAdministratorSecurityUser(GolfClubTestData.GolfClubAdministratorSecurityUserId); }); }