/// <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);
}
public void AddWhenDepartmentNotSelected()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
DepartmentWorkspaceViewModel vm = BuildViewModel(ctx);
vm.CurrentDepartment = null;
TestAddDepartment(ctx, vm);
}
}
public void DeleteCommandOnlyAvailableWhenDepartmentSelected()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
DepartmentWorkspaceViewModel vm = BuildViewModel(ctx);
vm.CurrentDepartment = null;
Assert.IsFalse(vm.DeleteDepartmentCommand.CanExecute(null), "Delete command should be disabled when no department is selected.");
vm.CurrentDepartment = vm.AllDepartments.First();
Assert.IsTrue(vm.DeleteDepartmentCommand.CanExecute(null), "Delete command should be enabled when department is selected.");
}
}
public void InitializeWithData()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
UnitOfWork unit = new UnitOfWork(ctx);
ObservableCollection <DepartmentViewModel> departments = new ObservableCollection <DepartmentViewModel>(ctx.Departments.Select(d => new DepartmentViewModel(d)));
DepartmentWorkspaceViewModel vm = new DepartmentWorkspaceViewModel(departments, unit);
Assert.IsNotNull(vm.CurrentDepartment, "Current department should be set if there are departments.");
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");
}
}
public void ExternalAddToDepartmentCollection()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
DepartmentWorkspaceViewModel vm = BuildViewModel(ctx);
DepartmentViewModel currentDepartment = vm.CurrentDepartment;
DepartmentViewModel newDepartment = new DepartmentViewModel(new Department());
vm.AllDepartments.Add(newDepartment);
Assert.IsTrue(vm.AllDepartments.Contains(newDepartment), "New department should have been added to AllDepartments.");
Assert.AreSame(currentDepartment, vm.CurrentDepartment, "CurrentDepartment should not have changed.");
Assert.IsFalse(ctx.IsObjectTracked(newDepartment.Model), "ViewModel is not responsible for adding departments created externally.");
}
}
public void ExternalRemoveDepartmentFromCollection()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
DepartmentWorkspaceViewModel vm = BuildViewModel(ctx);
DepartmentViewModel currentDepartment = vm.AllDepartments.First();
DepartmentViewModel toDelete = vm.AllDepartments.Skip(1).First();
vm.CurrentDepartment = currentDepartment;
vm.AllDepartments.Remove(toDelete);
Assert.IsFalse(vm.AllDepartments.Contains(toDelete), "Department should have been removed from AllDepartments.");
Assert.AreSame(currentDepartment, vm.CurrentDepartment, "CurrentDepartment should not have changed.");
Assert.IsTrue(ctx.IsObjectTracked(toDelete.Model), "ViewModel is not responsible for deleting departments removed externally.");
}
}
/// <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 ExternalRemoveSelectedDepartmentFromCollection()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
DepartmentWorkspaceViewModel vm = BuildViewModel(ctx);
DepartmentViewModel currentDepartment = vm.CurrentDepartment;
string lastProperty = null;
vm.PropertyChanged += (sender, e) => { lastProperty = e.PropertyName; };
vm.AllDepartments.Remove(currentDepartment);
Assert.IsFalse(vm.AllDepartments.Contains(currentDepartment), "Department should have been removed from AllDepartments.");
Assert.IsNull(vm.CurrentDepartment, "CurrentDepartment should have been nulled as it was removed from the collection.");
Assert.AreEqual("CurrentDepartment", lastProperty, "CurrentDepartment should have raised a PropertyChanged.");
Assert.IsTrue(ctx.IsObjectTracked(currentDepartment.Model), "ViewModel is not responsible for deleting departments removed externally.");
}
}
public void CurrentDepartment()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
DepartmentWorkspaceViewModel vm = BuildViewModel(ctx);
string lastProperty;
vm.PropertyChanged += (sender, e) => { lastProperty = e.PropertyName; };
lastProperty = null;
vm.CurrentDepartment = null;
Assert.IsNull(vm.CurrentDepartment, "CurrentDepartment should have been nulled.");
Assert.AreEqual("CurrentDepartment", lastProperty, "CurrentDepartment should have raised a PropertyChanged when set to null.");
lastProperty = null;
var department = vm.AllDepartments.First();
vm.CurrentDepartment = department;
Assert.AreSame(department, vm.CurrentDepartment, "CurrentDepartment has not been set to specified value.");
Assert.AreEqual("CurrentDepartment", lastProperty, "CurrentDepartment should have raised a PropertyChanged when set to a value.");
}
}
public void DeleteDepartment()
{
using (FakeEmployeeContext ctx = BuildContextWithData())
{
DepartmentWorkspaceViewModel vm = BuildViewModel(ctx);
vm.CurrentDepartment = vm.AllDepartments.First();
DepartmentViewModel toDelete = vm.CurrentDepartment;
int originalCount = vm.AllDepartments.Count;
string lastProperty = null;
vm.PropertyChanged += (sender, e) => { lastProperty = e.PropertyName; };
vm.DeleteDepartmentCommand.Execute(null);
Assert.AreEqual(originalCount - 1, vm.AllDepartments.Count, "One department should have been removed from the AllDepartments property.");
Assert.IsFalse(vm.AllDepartments.Contains(toDelete), "The selected department should have been removed.");
Assert.IsFalse(ctx.IsObjectTracked(toDelete.Model), "The selected department has not been removed from the UnitOfWork.");
Assert.IsNull(vm.CurrentDepartment, "No department should be selected after deletion.");
Assert.AreEqual("CurrentDepartment", lastProperty, "CurrentDepartment should have raised a PropertyChanged.");
}
}
