public void GolfClubAggregate_CreateMatchSecretarySecurityUser_DuplicateSecurityUserId() { GolfClubAggregate aggregate = GolfClubTestData.GetCreatedGolfClubAggregateWithMatchSecretaryUser(); Should.Throw <InvalidOperationException>(() => { aggregate.CreateMatchSecretarySecurityUser(GolfClubTestData.MatchSecretarySecurityUserId); }); }