--- a/services/healthreport/Makefile.in
+++ b/services/healthreport/Makefile.in
@@ -13,16 +13,17 @@ modules := \
   healthreporter.jsm \
   policy.jsm \
   profile.jsm \
   providers.jsm \
   $(NULL)
 
 testing_modules := \
   mocks.jsm \
+  utils.jsm \
   $(NULL)
 
 TEST_DIRS += tests
 
 MODULES_FILES := $(modules)
 MODULES_DEST = $(FINAL_TARGET)/modules/services/healthreport
 INSTALL_TARGETS += MODULES
 

new file mode 100644
--- /dev/null
+++ b/services/healthreport/modules-testing/utils.jsm
@@ -0,0 +1,73 @@
+/* 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/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = [
+  "getAppInfo",
+  "updateAppInfo",
+];
+
+
+const {interfaces: Ci, results: Cr, utils: Cu} = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+let APP_INFO = {
+  vendor: "Mozilla",
+  name: "xpcshell",
+  ID: "xpcshell@tests.mozilla.org",
+  version: "1",
+  appBuildID: "20121107",
+  platformVersion: "p-ver",
+  platformBuildID: "20121106",
+  inSafeMode: false,
+  logConsoleErrors: true,
+  OS: "XPCShell",
+  XPCOMABI: "noarch-spidermonkey",
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIXULAppInfo, Ci.nsIXULRuntime]),
+  invalidateCachesOnRestart: function() {},
+};
+
+
+/**
+ * Obtain a reference to the current object used to define XULAppInfo.
+ */
+this.getAppInfo = function () { return APP_INFO; }
+
+/**
+ * Update the current application info.
+ *
+ * If the argument is defined, it will be the object used. Else, APP_INFO is
+ * used.
+ *
+ * To change the current XULAppInfo, simply call this function. If there was
+ * a previously registered app info object, it will be unloaded and replaced.
+ */
+this.updateAppInfo = function (obj) {
+  obj = obj || APP_INFO;
+  APP_INFO = obj;
+
+  let id = Components.ID("{fbfae60b-64a4-44ef-a911-08ceb70b9f31}");
+  let cid = "@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(cid, Ci.nsIFactory);
+    registrar.unregisterFactory(id, existing);
+  } catch (ex) {}
+
+  let factory = {
+    createInstance: function (outer, iid) {
+      if (outer != null) {
+        throw Cr.NS_ERROR_NO_AGGREGATION;
+      }
+
+      return obj.QueryInterface(iid);
+    },
+  };
+
+  registrar.registerFactory(id, "XULAppInfo", cid, factory);
+};

--- a/services/healthreport/tests/xpcshell/head.js
+++ b/services/healthreport/tests/xpcshell/head.js
@@ -9,8 +9,14 @@ do_get_profile();
 (function initMetricsTestingInfrastructure() {
   let ns = {};
   Components.utils.import("resource://testing-common/services-common/logging.js",
                           ns);
 
   ns.initTestLogging();
 }).call(this);
 
+(function createAppInfo() {
+  let ns = {};
+  Components.utils.import("resource://testing-common/services/healthreport/utils.jsm", ns);
+  ns.updateAppInfo();
+}).call(this);
+

--- a/services/healthreport/tests/xpcshell/test_provider_appinfo.js
+++ b/services/healthreport/tests/xpcshell/test_provider_appinfo.js
@@ -5,47 +5,16 @@
 
 const {interfaces: Ci, results: Cr, utils: Cu} = Components;
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/services/healthreport/providers.jsm");
 Cu.import("resource://gre/modules/services/metrics/dataprovider.jsm");
 
 function run_test() {
-  let appInfo = {
-    vendor: "Mozilla",
-    name: "xpcshell",
-    ID: "xpcshell@tests.mozilla.org",
-    version: "1",
-    appBuildID: "20121107",
-    platformVersion: "p-ver",
-    platformBuildID: "20121106",
-    inSafeMode: false,
-    logConsoleErrors: true,
-    OS: "XPCShell",
-    XPCOMABI: "noarch-spidermonkey",
-    QueryInterface: XPCOMUtils.generateQI([Ci.nsIXULAppInfo, Ci.nsIXULRuntime]),
-    invalidateCachesOnRestart: function() {},
-  };
-
-  let factory = {
-    createInstance: function createInstance(outer, iid) {
-      if (outer != null) {
-        throw Cr.NS_ERROR_NO_AGGREGATION;
-      }
-
-      return appInfo.QueryInterface(iid);
-    },
-  };
-
-  let registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
-  registrar.registerFactory(Components.ID("{fbfae60b-64a4-44ef-a911-08ceb70b9f31}"),
-                            "XULAppInfo", "@mozilla.org/xre/app-info;1",
-                            factory);
-
   run_next_test();
 }
 
 add_test(function test_constructor() {
   let provider = new AppInfoProvider();
 
   run_next_test();
 });