Function verifyTreeUpdate

tests/ListViewComponents/VirtualizeContentsViewTest.ts:128–196

(layout, validate, complete)

    }

    function verifyTreeUpdate(layout, validate, complete) {
        WinJS.UI._VirtualizeContentsView._chunkSize = 15;
        WinJS.UI._VirtualizeContentsView._maxTimePerCreateContainers = Number.MAX_VALUE;

        var placeholder = createListViewElement();

        var list = new WinJS.Binding.List(initData()),
            listView = new ListView(placeholder, {
                itemDataSource: list.dataSource,
                itemTemplate: generateRenderer("50px"),
                layout: layout
            });

        listView.selection.set([0, 5, 10]);

        return Helper.ListView.waitForReady(listView)().then(function () {

            validate(listView);

            list.splice(9, 1);
            list.shift();
            list.shift();
            list.shift();
            list.unshift({
                title: "NewItem0",
                group: 0
            });

            return Helper.ListView.waitForReady(listView, -1)();
        }).then(function () {

                validate(listView);

                for (var i = 0; i < 10; i++) {
                    list.unshift({
                        title: "NI" + i,
                        group: 0
                    });
                }

                return Helper.ListView.waitForReady(listView, -1)();
            }).then(function () {

                validate(listView);

                while (list.length) {
                    list.pop();
                }

                return Helper.ListView.waitForReady(listView, -1)();
            }).then(function () {

                validate(listView);

                list.unshift({
                    title: "SNI",
                    group: 0
                });