public void CumulativeReportGeneration()
        {
            // Create new log for a vending machine that sells only coke
            TransLog log  = new TransLog();
            Item     coke = new Item("Coca Cola", "drink", 2.35m, "A2", 1);

            log.ItemsSold.Add(coke.Name, 0); // starts with 0 sold

            // log a sale
            decimal balance = 10.00m;

            log.LogPurchase(balance, coke);

            // Clear files before writing
            File.Delete(log.LogPath); // don't need the log file for this test
            if (File.Exists(log.ReportPath))
            {
                File.Delete(log.ReportPath);
            }

            // generate the report
            log.GenerateReport();

            // Does the report exist?
            Assert.IsTrue(File.Exists(log.ReportPath), "Report file should be created.");

            // Does it have the expected info and formatting inside?
            string expected = "Coca Cola|1";

            using (StreamReader sr = new StreamReader(log.ReportPath))
            {
                Assert.AreEqual(expected, sr.ReadLine(), "Report should contain the expected output.");
            }
            File.Delete(log.ReportPath);
        }
        public void PurchaseLogging()
        {
            // Setup new log and the money amounts
            TransLog log = new TransLog();

            File.Delete(log.LogPath);
            decimal balance = 10.00m;

            // Add a coke to the log inventory
            Item coke = new Item("Coca Cola", "drink", 2.35m, "A2", 1);

            log.ItemsSold.Add(coke.Name, 0); // starts with 0 sold

            // Log the GIVE CHANGE operation
            DateTime time = log.Time;

            log.LogPurchase(balance, coke);
            using (StreamReader sr = new StreamReader(log.LogPath))
            {
                string expected = $"{time} {coke.Name.PadRight(22)} {coke.Slot} {(balance + coke.Price):C} - {coke.Price:C} = {balance:C}";
                Assert.AreEqual(expected, sr.ReadLine(), "Log text should match expected string.");
            }
            File.Delete(log.LogPath);
        }