public void TestRemoveSourceCollection()
{
var coll1 = Enumerable.Range(0, 5).ToList();
var coll2 = Enumerable.Range(5, 5).ToList();
var coll3 = Enumerable.Range(10, 5).ToList();
var union = new ObservableCollection <IEnumerable <int> > {
coll1, coll2, coll3
};
var collection = new ReadOnlyObservableList <IEnumerable <int> >(union).ListSelectMany(coll => coll);
var copy = collection.ListSelect(i => i);
Assert.AreEqual(15, collection.Count);
Assert.IsTrue(Enumerable.Range(0, 15).SequenceEqual(collection));
Assert.AreEqual(15, copy.Count);
Assert.IsTrue(collection.SequenceEqual(copy));
union.RemoveAt(1);
Assert.AreEqual(10, collection.Count);
Assert.IsTrue(Enumerable.Range(0, 5).Concat(Enumerable.Range(10, 5)).SequenceEqual(collection));
Assert.AreEqual(10, copy.Count);
Assert.IsTrue(collection.SequenceEqual(copy));
}
