public void Delegate_event_handler_should_be_called_when_subscriber_not_GC_collected()
{
// Arrange
var view = new SomeView();
var model = new SomeViewModel();
SubscribeWeakly.OnCustomDelegate <PropertyChangedEventHandler, PropertyChangedEventArgs, SomeView>(
a => a.Invoke,
h => model.PropertyChanged += h,
h => model.PropertyChanged -= h,
view, (v, sender, args) => v.OnPropertyChanged());
// Act
model.NotifyPropertyChanged();
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeTrue();
}
public void Delegate_event_method_handler_should_be_called_when_GC_collected_and_subscriber_is_used_aftrewards()
{
// Arrange
var view = new SomeView();
var model = new SomeViewModel();
SubscribeWeakly.OnCustomDelegate <PropertyChangedEventHandler, PropertyChangedEventArgs>(
a => a.Invoke,
h => model.PropertyChanged += h,
h => model.PropertyChanged -= h,
view.OnPropertyChanged);
// Act
GC.Collect();
model.NotifyPropertyChanged();
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeTrue();
}
public void Delegate_event_method_handler_should_not_be_called_when_subscription_disposed()
{
// Arrange
var view = new SomeView();
var model = new SomeViewModel();
var subscription = SubscribeWeakly.OnCustomDelegate <PropertyChangedEventHandler, PropertyChangedEventArgs>(
a => a.Invoke,
h => model.PropertyChanged += h,
h => model.PropertyChanged -= h,
view.OnPropertyChanged);
// Act
subscription.Dispose();
model.NotifyPropertyChanged();
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeFalse();
}
public void Delegate_event_method_handler_should_not_be_called_when_GC_collected_and_subscriber_is_not_used_aftrewards()
{
// Arrange
var view = new SomeView();
var model = new SomeViewModel();
SubscribeWeakly.OnCustomDelegate <PropertyChangedEventHandler, PropertyChangedEventArgs>(
a => a.Invoke,
h => model.PropertyChanged += h,
h => model.PropertyChanged -= h,
view.OnPropertyChanged);
// Act
var observer = view.Observer;
// ReSharper disable RedundantAssignment
view = null;
// ReSharper restore RedundantAssignment
GC.Collect();
model.NotifyPropertyChanged();
// Assert
observer.IsPropertyChangedHandled.Should().BeFalse();
}