public void AddPurchase() { if (productService.GetAllProducts().Count > 0 && clientService.GetAllClients().Count > 0) { int clientId = clientService.GetLastlyAddedClient()._id; int productId = productService.GetLastlyAddedProduct()._id; PurchaseEvent e = new PurchaseEvent() { ClientId = clientId, ProductId = productId, EventDate = DateTime.Now.ToLongDateString() }; Assert.IsTrue(purchaseService.AddPurchaseEvent(e)); } }