     import mx.collections.ComplexSortField;
     import mx.collections.IList;
     import mx.collections.ListCollectionView;
-    import mx.collections.Sort;
-    import mx.collections.SortField;
+    import spark.collections.Sort;
+    import spark.collections.SortField;
 
     import org.flexunit.assertThat;
 

            _sut.addAll(from0To4); //values[address.street]: Street0, Street1, Street2, Street3, Street4

            const sortByIndexAscending:Sort = new Sort();
            sortByIndexAscending.fields = [new ComplexSortField("address.street", false, false, false)];
            _sut.sort = sortByIndexAscending;
            _sut.refresh(); //values[address.street] (unchanged): Street0, Street1, Street2, Street3, Street4


            _sut.addAll(from0To4); //values: Object0, Object1, Object2, Object3, Object4

            const sortByIndexDescending:Sort = new Sort();
            sortByIndexDescending.fields = [new SortField("index", true, true)];
            _sut.sort = sortByIndexDescending;
            _sut.refresh(); //values: Object4, Object3, Object2, Object1, Object0

