public void IsTrackingCountChangesReturnsCorrectValue()
{
// given
using (var observableDictionary = new ObservableDictionary<int, string>())
{
// when
using (observableDictionary.SuppressCountChangeNotifications())
{
observableDictionary.IsTrackingCountChanges.Should().BeFalse();
}
observableDictionary.IsTrackingCountChanges.Should().BeTrue();
}
}
public void SuppressCountChangedNotificationsShouldThrowObjectDisposedExceptionAfterDictionaryDisposal()
{
// given
var observableDictionary = new ObservableDictionary<int, string>();
observableDictionary.Dispose();
// when
Action action = () => { var suppression = observableDictionary.SuppressCountChangeNotifications(); };
action
.ShouldThrow<ObjectDisposedException>()
.WithMessage($"Cannot access a disposed object.\r\nObject name: '{observableDictionary.GetType().Name}'.");
}
public void SuppressCountChangedNotificationsSuppressesCountChangedNotifications()
{
// given
var scheduler = new TestScheduler();
var countChangesObserver = scheduler.CreateObserver<int>();
using (var observableDictionary = new ObservableDictionary<int, string>(scheduler: scheduler))
{
// when
observableDictionary.ThresholdAmountWhenChangesAreNotifiedAsReset = int.MaxValue;
IDisposable countChangesSubscription = null;
try
{
countChangesSubscription = observableDictionary.CountChanges.Subscribe(countChangesObserver);
using (observableDictionary.SuppressCountChangeNotifications(false))
{
observableDictionary.Add(1, "One");
observableDictionary.Add(2, "Two");
observableDictionary.Remove(1);
observableDictionary.Remove(2);
scheduler.AdvanceBy(4);
}
scheduler.AdvanceBy(1);
// then
countChangesObserver.Messages.Should().BeEmpty();
}
finally
{
countChangesSubscription?.Dispose();
}
}
}
public void SuppressCountChangedNotificationsPreventsMultipleSuppressions()
{
// given
using (var observableDictionary = new ObservableDictionary<int, string>())
{
// when
using (observableDictionary.SuppressCountChangeNotifications())
{
Action action = () => { var secondSuppression = observableDictionary.SuppressCountChangeNotifications(); };
action
.ShouldThrow<InvalidOperationException>()
.WithMessage("A Count Change(s) Notification Suppression is currently already ongoing, multiple concurrent suppressions are not supported.");
}
}
}
