public void TestSwap()
{
List <int> list1, list2;
SparseAList <int> alist1 = NewList(10, out list1);
SparseAList <int> alist2 = NewList(100, out list2);
// Can't Swap with a frozen list
SparseAList <int> frozen = alist1.Clone();
frozen.Freeze();
if (_testExceptions)
{
AssertThrows <ReadOnlyException>(() => alist1.Swap(frozen));
}
// Swap, and ensure that ListChanging and NodeObserver are swapped.
alist1.ListChanging += (sender, args) => Assert.Fail();
alist1.AddObserver(new AListTestObserver <int, int>());
alist1.Swap(alist2);
Assert.AreEqual(0, alist1.ObserverCount);
Assert.AreEqual(1, alist2.ObserverCount);
list2.Add(999);
alist1.Add(999);
ExpectList(alist1, list2, false);
ExpectList(alist2, list1, true);
}