private IList <Invoice> CreateInvoices(IList <CarePackage> carePackages) { var invoices = new List <Invoice>(); foreach (var carePackage in carePackages) { var invoice = TestDataHelper.CreateInvoice(carePackage, 10m, 10m, 10m); invoice.Items = 5.ItemsOf(() => TestDataHelper.CreateInvoiceItem(invoice, _periodFrom, _periodTo)); invoices.Add(invoice); } return(_generator.CreateInvoices(invoices)); }