public void InventoryRecord_ShouldHave_ProductID_Increment_Notes() {
            InventoryRecord rec = new InventoryRecord(1, 1, "notes");
            Assert.AreEqual(1, rec.ProductID);
            Assert.AreEqual(1, rec.Increment);
            Assert.AreEqual("notes", rec.Notes);

        }
        public TestInventoryRepository() {
            inventoryRecords = new List<InventoryRecord>();
            
            //one for each product
            TestCatalogRepository catalog = new TestCatalogRepository();
            List<Product> prods = catalog.GetProducts().ToList();

            foreach (Product p in prods) {
                InventoryRecord rec = new InventoryRecord(p.ID,1,"test entry");
                inventoryRecords.Add(rec);
            }

        
        }
        public void Increment(int productID, int amount, string notes) {
            InventoryRecord record = new InventoryRecord(productID, amount, notes);
            inventoryRecords.Add(record);

        }