public void ExceptionTest()
{
var collection = new ObservableCollection<int>();
AssertThrow<ArgumentNullException>(
() => ((ObservableCollection<int>)null).AddChangeHandlers((int i, int j) => { }, (i, j) => { }, () => { }),
() => collection.AddChangeHandlers(null, (int i, int j) => { }, () => { }),
() => collection.AddChangeHandlers((int i, int j) => { }, null, () => { }),
() => collection.AddChangeHandlers((int i, int j) => { }, (i, j) => { }, null),
() => ((ObservableCollection<int>)null).Project((int i) => i),
() => collection.Project((Func<int, int>)null));
}
private void AssertChange(Action<ObservableCollection<int>> change)
{
var o = new ObservableCollection<int>(Enumerable.Range(0, this.Random.Next(4, 10)));
var c = new List<int>();
var handler = o.AddChangeHandlers(
(int index, int item) => c.Insert(index, item), (index, item) => c.RemoveAt(index), c.Clear);
AssertChange(o, change, c, handler);
using (var projection = o.Project((int i) => i))
{
AssertChange(o, change, projection);
}
}