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diff --git a/testing/modules/AppInfo.sys.mjs b/testing/modules/AppInfo.sys.mjs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+let origPlatformInfo = Cc["@mozilla.org/xre/app-info;1"].getService(
+ Ci.nsIPlatformInfo
+);
+
+// eslint-disable-next-line mozilla/use-services
+let origRuntime = Cc["@mozilla.org/xre/app-info;1"].getService(
+ Ci.nsIXULRuntime
+);
+
+/**
+ * Create new XULAppInfo instance with specified options.
+ *
+ * options is a object with following keys:
+ * ID: nsIXULAppInfo.ID
+ * name: nsIXULAppInfo.name
+ * version: nsIXULAppInfo.version
+ * platformVersion: nsIXULAppInfo.platformVersion
+ * OS: nsIXULRuntime.OS
+ * appBuildID: nsIXULRuntime.appBuildID
+ * lastAppBuildID: nsIXULRuntime.lastAppBuildID
+ * lastAppVersion: nsIXULRuntime.lastAppVersion
+ *
+ * crashReporter: nsICrashReporter interface is implemented if true
+ */
+export var newAppInfo = function (options = {}) {
+ let appInfo = {
+ // nsIXULAppInfo
+ vendor: "Mozilla",
+ name: options.name ?? "xpcshell",
+ ID: options.ID ?? "xpcshell@tests.mozilla.org",
+ version: options.version ?? "1",
+ appBuildID: options.appBuildID ?? "20160315",
+
+ // nsIPlatformInfo
+ platformVersion: options.platformVersion ?? "p-ver",
+ platformBuildID: origPlatformInfo.platformBuildID,
+
+ // nsIXULRuntime
+ ...Ci.nsIXULRuntime,
+ inSafeMode: false,
+ logConsoleErrors: true,
+ OS: options.OS ?? "XPCShell",
+ XPCOMABI: "noarch-spidermonkey",
+ invalidateCachesOnRestart() {},
+ processType: origRuntime.processType,
+ uniqueProcessID: origRuntime.uniqueProcessID,
+
+ fissionAutostart: origRuntime.fissionAutostart,
+ sessionHistoryInParent: origRuntime.sessionHistoryInParent,
+ browserTabsRemoteAutostart: origRuntime.browserTabsRemoteAutostart,
+ get maxWebProcessCount() {
+ return origRuntime.maxWebProcessCount;
+ },
+ get launcherProcessState() {
+ return origRuntime.launcherProcessState;
+ },
+
+ // nsIWinAppHelper
+ get userCanElevate() {
+ return false;
+ },
+ };
+
+ appInfo.lastAppBuildID = options.lastAppBuildID ?? appInfo.appBuildID;
+ appInfo.lastAppVersion = options.lastAppVersion ?? appInfo.version;
+
+ let interfaces = [
+ Ci.nsIXULAppInfo,
+ Ci.nsIPlatformInfo,
+ Ci.nsIXULRuntime,
+ Ci.nsICrashReporter,
+ ];
+ if ("nsIWinAppHelper" in Ci) {
+ interfaces.push(Ci.nsIWinAppHelper);
+ }
+
+ // nsICrashReporter
+ appInfo.annotations = {};
+ appInfo.annotateCrashReport = function (key, data) {
+ if (options.crashReporter) {
+ this.annotations[key] = data;
+ } else {
+ throw Components.Exception("", Cr.NS_ERROR_NOT_INITIALIZED);
+ }
+ };
+
+ appInfo.QueryInterface = ChromeUtils.generateQI(interfaces);
+
+ return appInfo;
+};
+
+var currentAppInfo = newAppInfo();
+
+/**
+ * Obtain a reference to the current object used to define XULAppInfo.
+ */
+export var getAppInfo = function () {
+ return currentAppInfo;
+};
+
+/**
+ * Update the current application info.
+ *
+ * See newAppInfo for options.
+ *
+ * To change the current XULAppInfo, simply call this function. If there was
+ * a previously registered app info object, it will be unloaded and replaced.
+ */
+export var updateAppInfo = function (options) {
+ currentAppInfo = newAppInfo(options);
+
+ let id = Components.ID("{fbfae60b-64a4-44ef-a911-08ceb70b9f31}");
+ let contractid = "@mozilla.org/xre/app-info;1";
+ let registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
+
+ // Unregister an existing factory if one exists.
+ try {
+ let existing = Components.manager.getClassObjectByContractID(
+ contractid,
+ Ci.nsIFactory
+ );
+ registrar.unregisterFactory(id, existing);
+ } catch (ex) {}
+
+ let factory = {
+ createInstance(iid) {
+ return currentAppInfo.QueryInterface(iid);
+ },
+ };
+
+ Services.appinfo = currentAppInfo;
+
+ registrar.registerFactory(id, "XULAppInfo", contractid, factory);
+};