diff -r 000000000000 -r 6474c204b198 addon-sdk/source/test/addons/predefined-id-with-at/lib/main.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/test/addons/predefined-id-with-at/lib/main.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/* 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';
+
+const { id, preferencesBranch } = require('sdk/self');
+const simple = require('sdk/simple-prefs');
+const service = require('sdk/preferences/service');
+const { AddonManager } = require('chrome').Cu.import('resource://gre/modules/AddonManager.jsm', {});
+
+const expected_id = 'predefined-id@test';
+
+exports.testExpectedID = function(assert) {
+  assert.equal(id, expected_id, 'ID is as expected');
+  assert.equal(preferencesBranch, expected_id, 'preferences-branch is ' + expected_id);
+
+  assert.equal(simple.prefs.test, 5, 'test pref is 5');
+
+  simple.prefs.test2 = '25';
+  assert.equal(service.get('extensions.'+expected_id+'.test2'), '25', 'test pref is 25');
+  assert.equal(service.get('extensions.'+expected_id+'.test2'), simple.prefs.test2, 'test pref is 25');
+}
+
+exports.testSelfID = function(assert, done) {
+  assert.equal(typeof(id), 'string', 'self.id is a string');
+  assert.ok(id.length > 0, 'self.id not empty');
+
+  AddonManager.getAddonByID(id, function(addon) {
+    assert.equal(addon.id, id, 'found addon with self.id');
+    done();
+  });
+}
+
+require('sdk/test/runner').runTestsFromModule(module);