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This is the first chapter where we leave the realm of programmer tests. As we walk backwards from completion and a delivered product, through coding, design, and unit/controller tests, we reach the analysis stage that is covered by acceptance tests written from the perspective of users, customers, and business analysts. Acceptance testing broadly covers two parts of your analysis model: the business requirements (functional and non-functional requirements), which we cover in 8, and the behavioral requirements (use cases), which we cover in this chapter. When you write a use case, you re writing it in the form of scenarios ( sunny day scenario and rainy day scenarios, aka basic course and alternate courses). So it stands to reason that the tests you ll write for these are called scenario tests. Scenario tests are end-to-end tests that verify that the

Let s say you have a model (see Figure 12-11) representing an Employee and part of this entity includes the employee s salary. You have a business rule that an employee s salary cannot be increased by more than 10%. To enforce this rule, you want to check the new salary against the original salary for increases in excess of 10%. You want to do this check just before the entity is saved to the database.

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dsTables["Publishers"]Columns["pub_id"], dsTables["Titles"]Columns["pub_id"])); Cache["Pub_Title"] = ds; } return ds; } Centralizing this functionality is a good idea, because any code that needs this data does not need to be concerned with where the data comes from or the caching policy applied to the data Every place where this data is consumed simply calls the central function Notice also that you re using white space-separated select statements in the command text This results in the data adapter retrieving both result sets and creating a DataTable for each of them This technique can also be used with stored procedures that return multiple result sets After the DataTables have been created and added to the DataSet, you provide them with string names.

Figure 12-11. An Employee entity with the employee s salary To verify that a salary increase does not exceed 10%, as required by our business rule, we wire in a handler for the SavingChanges event. In the handler, we retrieve the current and original values. If the new value is more than 110% of the original value, we throw an exception. This exception, of course, causes the saving of the entity to fail. The code in Listing 12-8 provides the details. Listing 12-8. Handling the SavingChanges event to enforce the business rule class Program { static void Main(string[] args)

system behaves as expected, when the user pushes the expected buttons and also copes when some unexpected buttons are pushed too. By end-to-end, we mean that a scenario test verifies the complete scenario, from the initial screen being displayed, through each user step and system response, to the conclusion of the scenario. Sometimes scenario tests are automated, but they don t have to be. There s plenty of mileage in simply creating scenario test scripts that follow along the use case flow, and handing these test scripts to your QA team. In fact there s a lot to be said for human involvement in catching errors, and scenario tests provide a structured method for testers to follow. We ll illustrate this with a real-life example later in this chapter.

{ RunExample(); } static void RunExample() { using (var context = new EFRecipesEntities()) { var emp1 = new Employee { Name = "Roger Smith", Salary = 108000M }; var emp2 = new Employee { Name = "Jane Hall", Salary = 81500M }; context.Employees.AddObject(emp1); context.Employees.AddObject(emp2); context.SaveChanges(); emp1.Salary = emp1.Salary * 1.5M; try { context.SaveChanges(); } catch (Exception) { Console.WriteLine("Oops, tried to increase a salary too much!"); } } using (var context = new EFRecipesEntities()) { Console.WriteLine(); Console.WriteLine("Employees"); foreach (var emp in context.Employees) { Console.WriteLine("{0} makes {1}/year", emp.Name, emp.Salary.ToString("C")); } } } } public partial class EFRecipesEntities { partial void OnContextCreated() { this.SavingChanges += new EventHandler(EFRecipesEntities_SavingChanges); } void EFRecipesEntities_SavingChanges(object sender, EventArgs e) { var entries = this.ObjectStateManager .GetObjectStateEntries(EntityState.Modified) .Where(entry => entry.Entity is Employee); foreach (var entry in entries) { var salaryProp = entry.GetModifiedProperties()

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