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add_task(async function test() {
await BrowserTestUtils.withNewTab(
"data:text/plain;charset=utf-8,1",
async function (browser) {
BrowserTestUtils.loadURIString(
browser,
"data:text/plain;charset=utf-8,2"
);
await BrowserTestUtils.browserLoaded(browser);
BrowserTestUtils.loadURIString(
browser,
"data:text/plain;charset=utf-8,3"
);
await BrowserTestUtils.browserLoaded(browser);
await duplicate(0, "maintained the original index");
BrowserTestUtils.removeTab(gBrowser.selectedTab);
await duplicate(-1, "went back");
await duplicate(1, "went forward");
BrowserTestUtils.removeTab(gBrowser.selectedTab);
BrowserTestUtils.removeTab(gBrowser.selectedTab);
}
);
});
async function promiseGetIndex(browser) {
if (!SpecialPowers.Services.appinfo.sessionHistoryInParent) {
return SpecialPowers.spawn(browser, [], function () {
let shistory =
docShell.browsingContext.childSessionHistory.legacySHistory;
return shistory.index;
});
}
let shistory = browser.browsingContext.sessionHistory;
return shistory.index;
}
let duplicate = async function (delta, msg, cb) {
var startIndex = await promiseGetIndex(gBrowser.selectedBrowser);
duplicateTabIn(gBrowser.selectedTab, "tab", delta);
await BrowserTestUtils.waitForEvent(gBrowser.tabContainer, "SSTabRestored");
let endIndex = await promiseGetIndex(gBrowser.selectedBrowser);
is(endIndex, startIndex + delta, msg);
};
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