 
             //then
             assertItemsAre([4, 3, 2, 0]);
+            assertRemoveAll();
         }
 
         [Test]

            //then
            assertIndexesAre([4, 3, 2, 2, 1, 0]);
            assertNamesAre(["Object4", "Object3", "ABC2", "Object2", "Object1", "Object0"]);
        }

        [Test]


            //then
            assertItemsAre([100, 4, 3, 2, 0]);
            assertRemoveAll();
        }

        [Test]
