export var test_backstackVisible = function () {
    var mainTestPage = topmostFrame().currentPage;
    topmostFrame().navigate({ create: pageFactory });
    TKUnit.waitUntilReady(() => { return topmostFrame().currentPage !== mainTestPage; });

    // page1 should not be added to the backstack
    var page0 = topmostFrame().currentPage;
    topmostFrame().navigate({ create: pageFactory, backstackVisible: false });
    TKUnit.waitUntilReady(() => { return topmostFrame().currentPage !== page0; });

    var page1 = topmostFrame().currentPage;
    topmostFrame().navigate({ create: pageFactory });
    TKUnit.waitUntilReady(() => { return topmostFrame().currentPage !== page1; });

    var page2 = topmostFrame().currentPage;
    topmostFrame().goBack();
    TKUnit.waitUntilReady(() => { return topmostFrame().currentPage !== page2; });

    // From page2 we have to go directly to page0, skipping page1.
    TKUnit.assert(topmostFrame().currentPage === page0, "Page 1 should be skipped when going back.");

    topmostFrame().goBack();
    TKUnit.waitUntilReady(() => { return topmostFrame().currentPage === mainTestPage; });
}

 TKUnit.waitUntilReady(() => { return topmostFrame().currentPage !== currentPage; });