Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/tests/ppapi_browser/ppb_widget/ppapi_ppb_widget.js

+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function setupTests(tester, plugin) {
+  // This function takes an array of messages and asserts that the nexe
+  // calls PostMessage with each of these messages, in order.
+  function expectMessages(test, plugin, messages) {
+    test.assert(messages.length > 0, 'Must provide at least one message');
+    var listener = test.wrap(function(message) {
+      plugin.removeEventListener('message', listener, false);
+      test.assertEqual(message.data, messages.shift());
+      if (messages.length == 0) {
+        test.pass();
+      } else {
+        plugin.addEventListener('message', listener, false);
+      }
+    });
+    plugin.addEventListener('message', listener, false);
+  }
+
+  function addTest(test_name, responses) {
+    if (responses === undefined) {
+      responses = [];
+    }
+    var expected_messages = [test_name + ':PASSED'];
+    expected_messages.concat(responses);
+    tester.addAsyncTest('PPB_Widget::' + test_name, function(test) {
+      expectMessages(test, plugin, expected_messages);
+      plugin.postMessage(test_name)
+    });
+  }
+
+  addTest('TestIsWidget');
+  addTest('TestLocation');
+}