/// <summary>
/// 创建基于虚设上下文的 ViewModel
/// </summary>
/// <param name="ctx">视图模型基于的上下文</param>
/// <returns>新的 ViewModel</returns>
private static DepartmentWorkspaceViewModel BuildViewModel(FakeEmployeeContext ctx)
{
UnitOfWork unit = new UnitOfWork(ctx);
ObservableCollection<DepartmentViewModel> departments = new ObservableCollection<DepartmentViewModel>(ctx.Departments.Select(d => new DepartmentViewModel(d)));
DepartmentWorkspaceViewModel vm = new DepartmentWorkspaceViewModel(departments, unit);
return vm;
}
/// <summary>
/// 验证向工作区和工作单元添加部门的操作
/// </summary>
/// <param name="ctx">应将部门添加到的上下文</param>
/// <param name="vm">要将部门添加到的工作区</param>
private static void TestAddDepartment(FakeEmployeeContext ctx, DepartmentWorkspaceViewModel vm)
{
List<DepartmentViewModel> originalDepartments = vm.AllDepartments.ToList();
string lastProperty = null;
vm.PropertyChanged += (sender, e) => { lastProperty = e.PropertyName; };
Assert.IsTrue(vm.AddDepartmentCommand.CanExecute(null), "Add command should always be enabled.");
vm.AddDepartmentCommand.Execute(null);
Assert.AreEqual(originalDepartments.Count + 1, vm.AllDepartments.Count, "One new department should have been added to the AllDepartments property.");
Assert.IsFalse(originalDepartments.Contains(vm.CurrentDepartment), "The new department should be selected.");
Assert.IsNotNull(vm.CurrentDepartment, "The new department should be selected.");
Assert.AreEqual("CurrentDepartment", lastProperty, "CurrentDepartment should have raised a PropertyChanged.");
Assert.IsTrue(ctx.IsObjectTracked(vm.CurrentDepartment.Model), "The new department has not been added to the context.");
}
public void InitializeWithEmptyData()
{
using (FakeEmployeeContext ctx = new FakeEmployeeContext())
{
UnitOfWork unit = new UnitOfWork(ctx);
ObservableCollection<DepartmentViewModel> departments = new ObservableCollection<DepartmentViewModel>();
DepartmentWorkspaceViewModel vm = new DepartmentWorkspaceViewModel(departments, unit);
Assert.IsNull(vm.CurrentDepartment, "Current department should not be set if there are no department.");
Assert.AreSame(departments, vm.AllDepartments, "ViewModel should expose the same instance of the collection so that changes outside the ViewModel are reflected.");
Assert.IsNotNull(vm.AddDepartmentCommand, "AddDepartmentCommand should be initialized");
Assert.IsNotNull(vm.DeleteDepartmentCommand, "DeleteDepartmentCommand should be initialized");
}
}