Create an apptesting framework for dart.

mojo/dart/apptest/apptest/apptest.dart

Index: mojo/dart/apptest/apptest/apptest.dart
diff --git a/mojo/dart/apptest/apptest/apptest.dart b/mojo/dart/apptest/apptest/apptest.dart
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+// Copyright 2015 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.
+
+library apptest;
+
+import 'dart:async';
+import 'mojo:application';
+import 'mojo:bindings';
+import 'mojo:core';
+
+// Import and reexport the unittest package. We are a *.dartzip file designed to
+// be linked into your_apptest.mojo file and are your main entrypoint.
+import 'package:unittest/unittest.dart';
+export 'package:unittest/unittest.dart';
+
+// This class is an application that does nothing but tears down the connections
+// between each test.
+class _ConnectionToShellApplication extends Application {
+  final List<Function> _testFunctions;
+
+  _ConnectionToShellApplication.fromHandle(MojoHandle handle,
+      this._testFunctions)
+      : super.fromHandle(handle);
+
+  // Only run the test suite passed in once we have received an initialize()
+  // call from the shell. We need to first have a valid connection to the shell
+  // so that apptests can connect to other applications.
+  void initialize(List<String> args, String url) {
+    _testFunctions.forEach((f) => f(this));
+  }
+}
+
+// A configuration which properly shuts down our application at the end.
+class _CleanShutdownConfiguration extends SimpleConfiguration {
+  final _ConnectionToShellApplication _application;
+
+  _CleanShutdownConfiguration(this._application) : super() {}
+
+  void onTestResult(TestCase externalTestCase) {
+    super.onTestResult(externalTestCase);
+    _application.resetConnections();
+  }
+
+  void onDone(bool success) {
+    _application.close();
+    super.onDone(success);
+  }
+}
+
+// The public interface to apptests.
+//
+// In a dart mojo application, |incoming_handle| is args[0]. |testFunction| is a
+// list of functions that actually contains your testing code, and will pass
+// back an application to each of them.
+runAppTests(var incomingHandle, List<Function> testFunction) {
+  var appHandle = new MojoHandle(incomingHandle);
+  var application =
+      new _ConnectionToShellApplication.fromHandle(appHandle, testFunction);
+  unittestConfiguration = new _CleanShutdownConfiguration(application);
+}