public void AddShouldInsertItemAndRaiseEvents()
        {
            // arrange
            var collection = new ObservableCollection <int>();
            var assert     = new Asserter();

            // act, assert (Count and Item[])
            assert.AddChangedCollection(collection, 1, c => c.Count, c => c[0]);
        }
        public void AddShouldInsertItem()
        {
            // arrange
            var collection = new ObservableCollection <int>();
            var assert     = new Asserter();

            // act, assert
            assert.AddChangedCollection(collection, 1);
        }