public void SaveEntryToDataBase()
{
double amount = 0;
mainDBHelper.InitializeNewBillEntry("Suresh", true);
mainDBHelper.UpdateCustomerName("Ram");
mainDBHelper.UpdatePhoneNumber("9447586655");
mainDBHelper.AddProduct("Selfie", out amount);
mainDBHelper.UpdateBillType(2);
mainDBHelper.UpdateDeliverStatus(true);
int beforeCount = dbHelper.GetBillEntryCount();
mainDBHelper.SaveEntryToDatabase();
int afterCount = dbHelper.GetBillEntryCount();
Assert.AreEqual(beforeCount + 1, afterCount, "Bill Entry not saved to the database");
mainDBHelper.UpdateBillType(1);
mainDBHelper.SaveEntryToDatabase();
int currentCount = dbHelper.GetBillEntryCount();
Assert.AreEqual(afterCount, currentCount, "Updating the entry should not add a record to the database.");
BillEntry latestEntry = dbHelper.GetCustomer("Ram", "9447586655");
Assert.IsNotNull(latestEntry, "Bill Entry should not be null");
Assert.AreEqual(2, (int)latestEntry.BillType, "Updated value didn't get saved after save.");
}