public void AcceptChangesShouldCommitChangesToAllItems()
{
// arrange
var items = new[] { new MockEditableObject(), new MockEditableObject() };
items[0].FirstName = "test1";
items[1].FirstName = "test2";
items.AcceptChanges();
// act
var unchanged = items.All( i => !i.IsChanged );
Assert.True( unchanged );
}