public void Filter_ignores_removed_items()
{
var obj1 = new MyObject { Value = 1 };
var obj2 = new MyObject { Value = 2 };
var obj3 = new MyObject { Value = 3 };
var objects = new ObservableCollection<MyObject> { obj1, obj2, obj3 };
var subject = new ObservableView<MyObject>(objects, x => x.Value%2 == 1);
objects.Remove(obj2);
obj2.ChangeValue(5);
subject.ToArray().ShouldBe(new[] { obj1, obj3 });
}
public void Filter_ignores_removed_items_even_after_source_reset()
{
var obj1 = new MyObject { Value = 1 };
var obj2 = new MyObject { Value = 2 };
var obj3 = new MyObject { Value = 3 };
var objects = new ObservableCollection<MyObject> { obj1, obj2, obj3 };
var subject = new ObservableView<MyObject>(objects, x => x.Value % 2 == 1);
objects.Clear();
obj2.ChangeValue(5);
subject.ShouldBeEmpty();
}
public void Filter_respects_item_changes()
{
var obj = new MyObject { Value = 0 };
var obj2 = new MyObject { Value = 2 };
var obj3 = new MyObject { Value = 3 };
var objects = new ObservableCollection<MyObject> { obj2, obj, obj3, obj };
var subject = new ObservableView<MyObject>(objects, x => x.Value > 0);
obj.ChangeValue(10);
obj2.ChangeValue(-1);
subject.ToArray().ShouldBe(new[] { obj, obj3, obj });
}
