public void ChangeTracking_EntityCollectionTracking()
{
var pc = new PersonCollection();
pc.TrackChanges();
Assert.IsTrue(pc.IsChangeTracking);
var p = new Person {
FirstName = "Jenny"
};
Assert.IsFalse(p.IsChangeTracking);
// Adding item will not pick up changes made prior to TrackChanges.
pc.Add(p);
Assert.IsTrue(pc.IsChanged);
Assert.IsTrue(p.IsChangeTracking);
Assert.IsTrue(p.IsChanged);
Assert.AreEqual(new System.Collections.Specialized.StringCollection(), p.ChangeTracking);
// Accept changes so no longer tracking anything.
pc.AcceptChanges();
Assert.IsFalse(pc.IsChangeTracking);
Assert.IsFalse(pc.IsChanged);
Assert.IsFalse(p.IsChangeTracking);
Assert.IsFalse(p.IsChanged);
// Track changes again updating only the person name - changes should bubble.
pc.TrackChanges();
p.FirstName = "Jennifer";
Assert.IsTrue(pc.IsChanged);
Assert.IsTrue(p.IsChanged);
Assert.AreEqual(new System.Collections.Specialized.StringCollection {
"FirstName"
}, p.ChangeTracking);
// Remove item from collection, changes should no longer bubble.
pc.AcceptChanges();
pc.Remove(p);
pc.AcceptChanges();
p.FirstName = "Jen";
Assert.IsFalse(pc.IsChanged);
Assert.IsTrue(p.IsChanged);
Assert.IsFalse(p.IsChangeTracking);
}
