public void ShouldDeliverErrorsWhenModelObservableValidationTriggers()
{
var viewModel = new IndeiTestViewModel();
const string namesShouldMatchMessage = "names should match.";
viewModel.ValidationRule(
vm => vm.OtherName,
viewModel.WhenAnyValue(
m => m.Name,
m => m.OtherName,
(name, other) => name == other),
namesShouldMatchMessage);
Assert.False(viewModel.HasErrors);
Assert.True(viewModel.ValidationContext.IsValid);
Assert.Single(viewModel.ValidationContext.Validations);
Assert.Empty(viewModel.GetErrors(nameof(viewModel.Name)).Cast <string>());
Assert.Empty(viewModel.GetErrors(nameof(viewModel.OtherName)).Cast <string>());
viewModel.Name = "JoJo";
viewModel.OtherName = "NoNo";
Assert.True(viewModel.HasErrors);
Assert.Empty(viewModel.GetErrors(nameof(viewModel.Name)).Cast <string>());
Assert.Single(viewModel.GetErrors(nameof(viewModel.OtherName)).Cast <string>());
Assert.Single(viewModel.ValidationContext.Text);
Assert.Equal(namesShouldMatchMessage, viewModel.ValidationContext.Text.Single());
}
public void ShouldFireErrorsChangedEventWhenValidationStateChanges()
{
var viewModel = new IndeiTestViewModel();
DataErrorsChangedEventArgs arguments = null;
viewModel.ErrorsChanged += (_, args) => arguments = args;
using var firstValidation = new BasePropertyValidation <IndeiTestViewModel, string>(
viewModel,
vm => vm.Name,
s => !string.IsNullOrEmpty(s),
NameShouldNotBeEmptyMessage);
viewModel.ValidationContext.Add(firstValidation);
Assert.True(viewModel.HasErrors);
Assert.False(viewModel.ValidationContext.IsValid);
Assert.Single(viewModel.ValidationContext.Validations);
Assert.Single(viewModel.GetErrors("Name").Cast <string>());
viewModel.Name = "JoJo";
Assert.False(viewModel.HasErrors);
Assert.Empty(viewModel.GetErrors("Name").Cast <string>());
Assert.NotNull(arguments);
Assert.Equal("Name", arguments.PropertyName);
}
public void ShouldDeliverErrorsWhenModelObservableValidationTriggers()
{
var viewModel = new IndeiTestViewModel();
string namesShouldMatchMessage = "names should match.";
var validation = new ModelObservableValidation <IndeiTestViewModel, string>(
viewModel,
vm => vm.OtherName,
vm => vm.WhenAnyValue(
m => m.Name,
m => m.OtherName,
(n, on) => new { n, on })
.Select(bothNames => bothNames.n == bothNames.on),
(_, isValid) => isValid ? string.Empty : namesShouldMatchMessage);
viewModel.ValidationContext.Add(validation);
Assert.False(viewModel.HasErrors);
Assert.True(viewModel.ValidationContext.IsValid);
Assert.Single(viewModel.ValidationContext.Validations);
Assert.Empty(viewModel.GetErrors(nameof(viewModel.Name)).Cast <string>());
Assert.Empty(viewModel.GetErrors(nameof(viewModel.OtherName)).Cast <string>());
viewModel.Name = "JoJo";
viewModel.OtherName = "NoNo";
Assert.True(viewModel.HasErrors);
Assert.Empty(viewModel.GetErrors(nameof(viewModel.Name)).Cast <string>());
Assert.Single(viewModel.GetErrors(nameof(viewModel.OtherName)).Cast <string>());
Assert.Single(validation.Text);
Assert.Equal(namesShouldMatchMessage, validation.Text.Single());
}
public void ShouldSynchronizeNotifyDataErrorInfoWithValidationContext()
{
var viewModel = new IndeiTestViewModel();
var view = new IndeiTestView(viewModel);
using var firstValidation = new BasePropertyValidation <IndeiTestViewModel, string>(
viewModel,
vm => vm.Name,
s => !string.IsNullOrEmpty(s),
NameShouldNotBeEmptyMessage);
viewModel.ValidationContext.Add(firstValidation);
view.Bind(view.ViewModel, vm => vm.Name, v => v.NameLabel);
view.BindValidation(view.ViewModel, vm => vm.Name, v => v.NameErrorLabel);
// Verify the initial state.
Assert.True(viewModel.HasErrors);
Assert.False(viewModel.ValidationContext.IsValid);
Assert.Single(viewModel.ValidationContext.Validations);
Assert.Equal(NameShouldNotBeEmptyMessage, viewModel.GetErrors("Name").Cast <string>().First());
Assert.Equal(NameShouldNotBeEmptyMessage, view.NameErrorLabel);
// Send INotifyPropertyChanged.
viewModel.Name = "JoJo";
// Verify the changed state.
Assert.False(viewModel.HasErrors);
Assert.True(viewModel.ValidationContext.IsValid);
Assert.Empty(viewModel.GetErrors("Name").Cast <string>());
Assert.Empty(view.NameErrorLabel);
// Send INotifyPropertyChanged.
viewModel.Name = string.Empty;
// Verify the changed state.
Assert.True(viewModel.HasErrors);
Assert.False(viewModel.ValidationContext.IsValid);
Assert.Single(viewModel.ValidationContext.Validations);
Assert.Equal(NameShouldNotBeEmptyMessage, viewModel.GetErrors("Name").Cast <string>().First());
Assert.Equal(NameShouldNotBeEmptyMessage, view.NameErrorLabel);
}
public void ShouldSendPropertyChangeNotificationsForCorrectProperties()
{
var viewModel = new IndeiTestViewModel();
viewModel.ValidationRule(
m => m.Name,
m => m is not null,
"Name shouldn't be null.");
viewModel.ValidationRule(
m => m.OtherName,
m => m is not null,
"Other name shouldn't be null.");
Assert.Single(viewModel.GetErrors(nameof(viewModel.Name)));
Assert.Single(viewModel.GetErrors(nameof(viewModel.OtherName)));
var arguments = new List <DataErrorsChangedEventArgs>();
viewModel.ErrorsChanged += (_, args) => arguments.Add(args);
viewModel.Name = "Josuke";
viewModel.OtherName = "Jotaro";
Assert.Equal(2, arguments.Count);
Assert.Equal(nameof(viewModel.Name), arguments[0].PropertyName);
Assert.Equal(nameof(viewModel.OtherName), arguments[1].PropertyName);
Assert.False(viewModel.HasErrors);
viewModel.Name = null;
viewModel.OtherName = null;
Assert.Equal(4, arguments.Count);
Assert.Equal(nameof(viewModel.Name), arguments[2].PropertyName);
Assert.Equal(nameof(viewModel.OtherName), arguments[3].PropertyName);
Assert.True(viewModel.HasErrors);
}
public void ShouldMarkPropertiesAsInvalidOnInit()
{
var viewModel = new IndeiTestViewModel();
var view = new IndeiTestView(viewModel);
using var firstValidation = new BasePropertyValidation <IndeiTestViewModel, string>(
viewModel,
vm => vm.Name,
s => !string.IsNullOrEmpty(s),
NameShouldNotBeEmptyMessage);
viewModel.ValidationContext.Add(firstValidation);
view.Bind(view.ViewModel, vm => vm.Name, v => v.NameLabel);
view.BindValidation(view.ViewModel, vm => vm.Name, v => v.NameErrorLabel);
// Verify validation context behavior.
Assert.False(viewModel.ValidationContext.IsValid);
Assert.Single(viewModel.ValidationContext.Validations);
Assert.Equal(NameShouldNotBeEmptyMessage, view.NameErrorLabel);
// Verify INotifyDataErrorInfo behavior.
Assert.True(viewModel.HasErrors);
Assert.Equal(NameShouldNotBeEmptyMessage, viewModel.GetErrors("Name").Cast <string>().First());
}