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diff --git a/tools/addon-sdk-1.4/packages/api-utils/tests/test-window-loader.js b/tools/addon-sdk-1.4/packages/api-utils/tests/test-window-loader.js
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+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is Mozilla.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Irakli Gozalishvili <gozala@mozilla.com> (Original author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+"use strict";
+
+const { WindowLoader } = require('windows/loader'),
+      { Trait } = require('traits');
+
+const Loader = Trait.compose(
+  WindowLoader,
+  {
+    constructor: function Loader(options) {
+      this._onLoad = options.onLoad;
+      this._onUnload = options.onUnload;
+      if ('window' in options)
+        this._window = options.window;
+      this._load();
+      this.window = this._window;
+    },
+    window: null,
+    _onLoad: null,
+    _onUnload: null,
+    _tabOptions: []
+  }
+);
+
+exports['test compositions with missing required properties'] = function(test) {
+  test.assertRaises(
+    function() WindowLoader.compose({})(),
+    'Missing required property: _onLoad',
+    'should throw missing required property exception'
+  );
+  test.assertRaises(
+    function() WindowLoader.compose({ _onLoad: null, _tabOptions: null })(),
+    'Missing required property: _onUnload',
+    'should throw missing required property `_onUnload`'
+  );
+  test.assertRaises(
+    function() WindowLoader.compose({ _onUnload: null, _tabOptions: null })(),
+    'Missing required property: _onLoad',
+    'should throw missing required property `_onLoad`'
+  );
+  test.assertRaises(
+    function() WindowLoader.compose({ _onUnload: null, _onLoad: null })(),
+    'Missing required property: _tabOptions',
+    'should throw missing required property `_tabOptions`'
+  );
+};
+
+exports['test `load` events'] = function(test) {
+  test.waitUntilDone();
+  let onLoadCalled = false;
+  Loader({
+    onLoad: function(window) {
+      onLoadCalled = true;
+      test.assertEqual(
+        window, this._window, 'windows should match'
+      );
+      test.assertEqual(
+        window.document.readyState, 'complete', 'window must be fully loaded'
+      );
+      window.close();
+    },
+    onUnload: function(window) {
+      test.assertEqual(
+        window, this._window, 'windows should match'
+      );
+      test.assertEqual(
+        window.document.readyState, 'complete', 'window must be fully loaded'
+      );
+      test.assert(onLoadCalled, 'load callback is supposed to be called');
+      test.done();
+    }
+  });
+};
+
+exports['test removeing listeners'] = function(test) {
+  test.waitUntilDone();
+  Loader({
+    onLoad: function(window) {
+      test.assertEqual(
+        window, this._window, 'windows should match'
+      );
+      window.close();
+    },
+    onUnload: function(window) {
+      test.done();
+    }
+  });
+};
+
+exports['test create loader from opened window'] = function(test) {
+  test.waitUntilDone();
+  let onUnloadCalled = false;
+  Loader({
+    onLoad: function(window) {
+      test.assertEqual(
+        window, this._window, 'windows should match'
+      );
+      test.assertEqual(
+        window.document.readyState, 'complete', 'window must be fully loaded'
+      );
+      Loader({
+        window: window,
+        onLoad: function(win) {
+          test.assertEqual(win, window, 'windows should match');
+          window.close();
+        },
+        onUnload: function(window) {
+          test.assert(onUnloadCalled, 'first handler should be called already');
+          test.done();
+        }
+      });
+    },
+    onUnload: function(window) {
+      onUnloadCalled = true;
+    }
+  });
+};
+