public void Items_cleared_from_the_binding_list_are_cleared_from_the_ObservableHashSet()
        {
            var oc = new ObservableHashSet <ListElement> {
                3, 1, 4, 1, 5, 9
            };
            var obbl = new ObservableBackedBindingList <ListElement>(oc);

            obbl.Clear();

            Assert.Equal(0, oc.Count);
        }
    public void Items_cleared_from_the_binding_list_are_cleared_from_the_ObservableCollection()
    {
        var oc = new ObservableCollection <ListElement>
        {
            3,
            1,
            4,
            1,
            5,
            9
        };
        var obbl = new ObservableBackedBindingList <ListElement>(oc);

        obbl.Clear();

        Assert.Empty(oc);
    }