browser_frameloader_swap_with_bfcache.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

add_task(async function test() {

  if (

    !SpecialPowers.Services.appinfo.sessionHistoryInParent ||

    !SpecialPowers.Services.prefs.getBoolPref("fission.bfcacheInParent")

) {

ok(

      true,

      "This test is currently only for the bfcache in the parent process."

);

    return;

  const uri =

    "data:text/html,<script>onpageshow = function(e) { document.documentElement.setAttribute('persisted', e.persisted); }; </script>";

  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, uri, true);

  let browser1 = tab1.linkedBrowser;

  let tab2 = await BrowserTestUtils.openNewForegroundTab(gBrowser, uri, true);

  let browser2 = tab2.linkedBrowser;

  BrowserTestUtils.startLoadingURIString(browser2, uri + "nextpage");

  await BrowserTestUtils.browserLoaded(browser2, false);

  gBrowser.swapBrowsersAndCloseOther(tab1, tab2);

  is(tab1.linkedBrowser, browser1, "Tab's browser should stay the same.");

  browser1.goBack(false);

  await BrowserTestUtils.browserLoaded(browser1, false);

  let persisted = await SpecialPowers.spawn(browser1, [], async function () {

    return content.document.documentElement.getAttribute("persisted");

});

  is(persisted, "false", "BFCache should be evicted when swapping browsers.");

  BrowserTestUtils.removeTab(tab1);

});