public void CollectionChangedFlagResetOnReFreeze()
{
//Arrange.
ObservableCollectionEx <object> collection = new ObservableCollectionEx <object>(false);
//Act.
collection.FreezeCollectionNotifications();
collection.Add(new object());
collection.UnfreezeCollectionNotifications();
collection.FreezeCollectionNotifications();
//Assert.
Assert.That(!collection.CollectionChangedWhileFrozen, $"The property {nameof(ObservableCollectionEx<object>.CollectionChangedWhileFrozen)} was not reset to False on re-freeze.");
}
public void UnfreezingImbalanceThrows()
{
//Arrange.
ObservableCollectionEx <object> collection = new ObservableCollectionEx <object>();
Random r = new Random();
int freezeCount = r.Next(5, 30);
int unfreezeCount = 0;
//Act.
for (int i = 0; i < freezeCount; ++i)
{
collection.FreezeCollectionNotifications();
}
//Assert.
Assert.Throws <InvalidOperationException>(() =>
{
for (int i = 0; i <= freezeCount; ++i)
{
++unfreezeCount;
collection.UnfreezeCollectionNotifications();
}
});
Assert.That(unfreezeCount - freezeCount == 1, $"Unfreezing did throw as expected, but did not do it at the expected iteration ({unfreezeCount}).");
}
public void Freeze()
{
//Arrange.
ObservableCollectionEx <object> collection = new ObservableCollectionEx <object>();
CollectionChangedHandler handler = SetupNotifyCollectionChangedHandler(collection);
//Act.
collection.FreezeCollectionNotifications();
collection.Add(new object());
//Assert.
Assert.That(handler.EventCount == 0, $"CollectionChanged event was raised {handler.EventCount} time(s) when it was allegedly frozen.");
}
public void CollectionChangedFlagNotResetWithoutAutoRaiseEvent()
{
//Arrange.
ObservableCollectionEx <object> collection = new ObservableCollectionEx <object>(false);
//Act.
collection.FreezeCollectionNotifications();
collection.Add(new object());
collection.UnfreezeCollectionNotifications();
//Assert.
Assert.That(collection.CollectionChangedWhileFrozen, $"The property {nameof(ObservableCollectionEx<object>.CollectionChangedWhileFrozen)} did not properly report true after unfreezing.");
}
public void CollectionChangedFlagResetWithAutoRaiseEvent()
{
//Arrange.
ObservableCollectionEx <object> collection = new ObservableCollectionEx <object>();
//Act.
collection.FreezeCollectionNotifications();
collection.Add(new object());
collection.UnfreezeCollectionNotifications();
//Assert.
Assert.That(!collection.CollectionChangedWhileFrozen, $"The collection did not reset the {nameof(ObservableCollectionEx<object>.CollectionChangedWhileFrozen)} property to false automatically after unfreezing.");
}
public void CollectionChangedDetectionWhileFrozen()
{
//Arrange.
ObservableCollectionEx <object> collection = new ObservableCollectionEx <object>();
CollectionChangedHandler handler = SetupNotifyCollectionChangedHandler(collection);
//Act.
collection.FreezeCollectionNotifications();
collection.Add(new object());
//Assert.
Assert.That(collection.CollectionChangedWhileFrozen, $"The collection changed while frozen but the change was not reported in the {nameof(ObservableCollectionEx<object>.CollectionChangedWhileFrozen)} property.");
}
public void AutoFireCollectionChangedOnUnfreeze()
{
//Arrange.
ObservableCollectionEx <object> collection = new ObservableCollectionEx <object>();
CollectionChangedHandler handler = SetupNotifyCollectionChangedHandler(collection);
//Act.
collection.FreezeCollectionNotifications();
collection.Add(new object());
collection.UnfreezeCollectionNotifications();
//Assert.
Assert.That(handler.EventCount == 1, $"CollectionChanged event was raised {handler.EventCount} time(s) when the count was expected to be 1.");
}