public void Can_safely_raise_event_even_when_no_subsriptions_were_made()
{
// Arrange
var viewModel = new SomeViewModel();
// Act
Assert.DoesNotThrow(() =>
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some")));
}
public void Can_safely_raise_event_even_when_no_subsriptions_were_made()
{
// Arrange
var viewModel = new SomeViewModel();
// Act
Assert.DoesNotThrow(() =>
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some")));
}
public void When_event_raised_the_Lambda_handler_should_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var handled = false;
viewModel.PropertyChanged += (sender, args) => handled = true;
// Act
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
handled.Should().BeTrue();
}
public void When_event_raised_the_Method_handler_should_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var view = new SomeView();
viewModel.PropertyChanged += view.OnPropertyChanged;
// Act
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeTrue();
}
public void With_no_subscriptions_should_unsibscribe_without_exception()
{
// Arrange
var viewModel = new SomeViewModel();
PropertyChangedEventHandler propertyChanged = (sender, args) => { };
// Act
viewModel.PropertyChanged -= propertyChanged;
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
// No exceptions expected
}
public void When_event_raised_and_GC_collected_and_despite_that_subscriber_is_still_used_then_the_Method_handler_should_not_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var view = new SomeView();
viewModel.PropertyChanged += view.OnPropertyChanged;
// Act
GC.Collect();
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeFalse();
}
public void When_event_raised_the_Lambda_handler_should_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var handled = false;
viewModel.PropertyChanged += (sender, args) => handled = true;
// Act
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
handled.Should().BeTrue();
}
public void When_event_raised_the_Method_handler_should_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var view = new SomeView();
viewModel.PropertyChanged += view.OnPropertyChanged;
// Act
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeTrue();
}
internal TimeSpan NotifyMethodsWithReflection(int times)
{
var view = new SomeView();
var viewModel = new SomeViewModel();
viewModel.SubscribeWeakly(x => x.Flag, view.OnFlagChanged);
var stopwatch = Stopwatch.StartNew();
for (var i = 0; i < times; i++)
viewModel.NotifyPropertyChanged();
stopwatch.Stop();
return stopwatch.Elapsed;
}
public void PropertyChanged_event_handler_should_be_called_when_GC_collected_and_subscriber_is_used_aftrewards()
{
// Arrange
var view = new SomeView();
var viewModel = new SomeViewModel();
viewModel.SubscribeWeakly(view, (x, _, e) => x.OnPropertyChanged());
// Act
GC.Collect();
viewModel.NotifyPropertyChanged();
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeTrue();
}
public void When_event_raised_and_GC_collected_and_despite_that_subscriber_is_still_used_then_the_Method_handler_should_not_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var view = new SomeView();
viewModel.PropertyChanged += view.OnPropertyChanged;
// Act
GC.Collect();
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeFalse();
}
public void When_Lambda_handler_is_unsubscribed_and_event_raised_then_the_handler_should_not_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var handled = false;
PropertyChangedEventHandler onPropertyChanged = (sender, args) => handled = true;
viewModel.PropertyChanged += onPropertyChanged;
// Act
viewModel.PropertyChanged -= onPropertyChanged;
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
handled.Should().BeFalse();
}
internal TimeSpan NotifyAsUsual(int times)
{
var someView = new SomeView();
var someViewModel = new SomeViewModel();
someViewModel.PropertyChanged += someView.OnPropertyChanged;
var stopwatch = Stopwatch.StartNew();
for (var i = 0; i < times; i++)
{
someViewModel.NotifyPropertyChanged();
}
stopwatch.Stop();
return stopwatch.Elapsed;
}
internal TimeSpan NotifyMethodsWithReflection(int times)
{
var view = new SomeView();
var viewModel = new SomeViewModel();
viewModel.SubscribeWeakly(x => x.Flag, view.OnFlagChanged);
var stopwatch = Stopwatch.StartNew();
for (var i = 0; i < times; i++)
{
viewModel.NotifyPropertyChanged();
}
stopwatch.Stop();
return(stopwatch.Elapsed);
}
internal TimeSpan NotifyAsUsual(int times)
{
var someView = new SomeView();
var someViewModel = new SomeViewModel();
someViewModel.PropertyChanged += someView.OnPropertyChanged;
var stopwatch = Stopwatch.StartNew();
for (var i = 0; i < times; i++)
{
someViewModel.NotifyPropertyChanged();
}
stopwatch.Stop();
return(stopwatch.Elapsed);
}
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 PropertyChanged_event_handler_should_not_be_called_when_GC_collected_and_subscriber_is_not_used_aftrewards()
{
// Arrange
var view = new SomeView();
var viewModel = new SomeViewModel();
viewModel.SubscribeWeakly(view, (x, _, e) => x.OnPropertyChanged());
// Act
var observer = view.Observer;
// ReSharper disable RedundantAssignment
view = null;
// ReSharper restore RedundantAssignment
GC.Collect();
viewModel.NotifyPropertyChanged();
// Assert
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();
}
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_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();
}
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 PropertyChanged_event_handler_should_be_called_when_GC_collected_and_subscriber_is_used_aftrewards()
{
// Arrange
var view = new SomeView();
var viewModel = new SomeViewModel();
viewModel.SubscribeWeakly(view, (x, _, e) => x.OnPropertyChanged());
// Act
GC.Collect();
viewModel.NotifyPropertyChanged();
// Assert
view.Observer.IsPropertyChangedHandled.Should().BeTrue();
}
public void With_no_subscriptions_should_unsibscribe_without_exception()
{
// Arrange
var viewModel = new SomeViewModel();
PropertyChangedEventHandler propertyChanged = (sender, args) => { };
// Act
viewModel.PropertyChanged -= propertyChanged;
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
// No exceptions expected
}
public void When_Lambda_handler_is_unsubscribed_and_event_raised_then_the_handler_should_not_be_called()
{
// Arrange
var viewModel = new SomeViewModel();
var handled = false;
PropertyChangedEventHandler onPropertyChanged = (sender, args) => handled = true;
viewModel.PropertyChanged += onPropertyChanged;
// Act
viewModel.PropertyChanged -= onPropertyChanged;
viewModel.NotifyPropertyChanged(new PropertyChangedEventArgs("some"));
// Assert
handled.Should().BeFalse();
}
public void PropertyChanged_event_handler_should_not_be_called_when_GC_collected_and_subscriber_is_not_used_aftrewards()
{
// Arrange
var view = new SomeView();
var viewModel = new SomeViewModel();
viewModel.SubscribeWeakly(view, (x, _, e) => x.OnPropertyChanged());
// Act
var observer = view.Observer;
// ReSharper disable RedundantAssignment
view = null;
// ReSharper restore RedundantAssignment
GC.Collect();
viewModel.NotifyPropertyChanged();
// Assert
observer.IsPropertyChangedHandled.Should().BeFalse();
}
