browser_windowless_troubleshoot_crash.js

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add_task(async function test_windowlessBrowserTroubleshootCrash() {

  let webNav = Services.appShell.createWindowlessBrowser(false);

  let loadURIOptions = {

    triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal({}),

};

  // will synchronously commit to the initial about:blank and finish the load

  webNav.loadURI(Services.io.newURI("about:blank"), loadURIOptions);

  is(webNav.document.location.href, "about:blank", "location is about:blank");

  is(webNav.document.readyState, "complete", "readyState is complete");

  let winUtils = webNav.document.defaultView.windowUtils;

  try {

    let layerManager = winUtils.layerManagerType;

ok(

      ["WebRender (Software)", "Fallback"].includes(layerManager),

      "windowless browser's layerManagerType should be 'WebRender (Software)' or 'Fallback': " +

        layerManager

);

  } catch (e) {

    // The windowless browser may not have a layermanager at all yet, and that's ok.

    // The troubleshooting code similarly skips over windows with no layer managers.

  ok(true, "not crashed");

  var { Troubleshoot } = ChromeUtils.importESModule(

    "resource://gre/modules/Troubleshoot.sys.mjs"

);

  var data = await Troubleshoot.snapshot();

  Assert.notStrictEqual(

    data.graphics.windowLayerManagerType,

    "None",

    "windowless browser window should not set windowLayerManagerType to 'None'"

);

  webNav.close();

});