public void ShouldTreatNullCollectionsAsEmpty()
{
CollectionEntityConfiguration config = new CollectionEntityConfiguration();
EntityChangeTracker <CollectionEntity> tracker = new EntityChangeTracker <CollectionEntity>(config);
CollectionEntity entity = new CollectionEntity()
{
Values = null
};
tracker.Attach(entity);
entity.Values = new List <int>()
{
4
};
var additionDetails = tracker.DetectCollectionChanges(entity, x => x.Values, ElementState.Added);
var additions = additionDetails.GetChanges();
Assert.AreEqual(1, additions.Count, "Only one addition to the collection should have been detected.");
var addition = additions.Single();
Assert.AreEqual(4, addition.Item, "The wrong value was detected as changed.");
Assert.AreEqual(ElementState.Added, addition.State, "The item should have been added.");
}
public void ShouldDetectModifiedRecordsInCollection()
{
CollectionEntityConfiguration config = new CollectionEntityConfiguration();
EntityChangeTracker <CollectionEntity> tracker = new EntityChangeTracker <CollectionEntity>(config);
CollectionEntity entity = new CollectionEntity()
{
Values = new List <int>()
{
1, 2, 3
}
};
tracker.Attach(entity);
entity.Values.Remove(1);
entity.Values.Add(4);
var additionDetails = tracker.DetectCollectionChanges(entity, x => x.Values, ElementState.Added);
var additions = additionDetails.GetChanges();
Assert.AreEqual(1, additions.Count, "Only one addition to the collection should have been detected.");
var addition = additions.Single();
Assert.AreEqual(4, addition.Item, "The wrong value was detected as changed.");
Assert.AreEqual(ElementState.Added, addition.State, "The item should have been added.");
var removalDetails = tracker.DetectCollectionChanges(entity, x => x.Values, ElementState.Removed);
var removals = removalDetails.GetChanges();
Assert.AreEqual(1, removals.Count, "Only one removal from the collection should have been detected.");
var removal = removals.Single();
Assert.AreEqual(1, removal.Item, "The wrong value was detected as changed.");
Assert.AreEqual(ElementState.Removed, removal.State, "The item should have been removed.");
}
