Add support for writing unit tests for Mojo-backed apps/extensions APIs.

extensions/test/data/api_test_base_unittest.js

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var test = require('test').binding;
+var unittestBindings = require('test_environment_specific_bindings');
+
+unittestBindings.exportTests([
+  function testEnvironment() {
+    test.assertTrue(!!$Array);
+    test.assertTrue(!!$Function);
+    test.assertTrue(!!$JSON);
+    test.assertTrue(!!$Object);
+    test.assertTrue(!!$RegExp);
+    test.assertTrue(!!$String);
+    test.assertTrue(!!privates);
+    test.assertTrue(!!define);
+    test.assertTrue(!!require);
+    test.assertTrue(!!requireNative);
+    test.assertTrue(!!requireAsync);
+    test.assertEq(undefined, chrome.runtime.lastError);
+    test.assertEq(undefined, chrome.extension.lastError);
+    test.succeed();
+  },
+  function testPromisesRun() {
+    Promise.resolve().then(test.callbackPass());
+  },
+  function testCommonModulesAreAvailable() {
+    var binding = require('binding');
+    var sendRequest = require('sendRequest');
+    var lastError = require('lastError');
+    test.assertTrue(!!binding);
+    test.assertTrue(!!sendRequest);
+    test.assertTrue(!!lastError);
+    test.succeed();
+  },
+  function testMojoModulesAreAvailable() {
+    Promise.all([
+      requireAsync('mojo/public/js/bindings/connection'),
+      requireAsync('mojo/public/js/bindings/core'),
+      requireAsync('content/public/renderer/service_provider'),
+    ]).then(test.callback(function(modules) {
+      var connection = modules[0];
+      var core = modules[1];
+      var serviceProvider = modules[2];
+      test.assertTrue(!!connection.Connection);
+      test.assertTrue(!!core.createMessagePipe);
+      test.assertTrue(!!serviceProvider.connectToService);
+    }));
+  },
+  function testTestBindings() {
+    var counter = 0;
+    function increment() {
+      counter++;
+    }
+    test.runWithUserGesture(increment);
+    test.runWithoutUserGesture(increment);
+    test.runWithModuleSystem(increment);
+    test.assertEq(3, counter);
+    test.assertFalse(test.isProcessingUserGesture());
+    test.assertTrue(!!test.getApiFeatures());
+    test.assertEq(0, test.getApiDefinitions().length);
+    test.succeed();
+  }
+], test.runTests, exports);