1 files changed, 139 insertions, 0 deletions
diff --git a/testing/modules/AppInfo.sys.mjs b/testing/modules/AppInfo.sys.mjs
new file mode 100644
index 0000000000..13e20851b2
--- /dev/null
+++ b/testing/modules/AppInfo.sys.mjs
@@ -0,0 +1,139 @@
+/* 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() {},
+    shouldBlockIncompatJaws: false,
+    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);
+};