public void View_is_readonly()
{
IList<int> trans = new ObservableView<int>(source);
trans.IsReadOnly.ShouldBe(true);
Should.Throw<InvalidOperationException>(() => trans.Add(3));
Should.Throw<InvalidOperationException>(() => trans.Clear());
Should.Throw<InvalidOperationException>(() => trans.Remove(3));
Should.Throw<InvalidOperationException>(() => trans.RemoveAt(0));
Should.Throw<InvalidOperationException>(() => trans.Insert(0, 3));
Should.Throw<InvalidOperationException>(() => trans[0] = 3);
}
