Create an apptesting framework for dart.

services/dart/dart_apptests/echo_apptests.dart

+// 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.
+
+import 'dart:async';
+import 'mojo:application';
+import 'mojo:bindings';
+import 'mojo:core';
+
+import 'package:apptest/apptest.dart';
+import 'package:services/dart/test/echo_service.mojom.dart';
+
+echoApptests(Application application) {
+  group('Echo Service Apptests', () {
+    test('String', () async {
+      var echoProxy = new EchoServiceProxy.unbound();
+      application.connectToService("mojo:dart_echo", echoProxy);
+
+      var v = await echoProxy.ptr.echoString("foo");
+      expect(v.value, equals("foo"));
+
+      var q = await echoProxy.ptr.echoString("quit");
+      expect(q.value, equals("quit"));
+    });
+
+    test('Empty String', () async {
+      var echoProxy = new EchoServiceProxy.unbound();
+      application.connectToService("mojo:dart_echo", echoProxy);
+
+      var v = await echoProxy.ptr.echoString("");
+      expect(v.value, equals(""));
+
+      var q = await echoProxy.ptr.echoString("quit");
+      expect(q.value, equals("quit"));
+    });
+
+    test('Null String', () async {
+      var echoProxy = new EchoServiceProxy.unbound();
+      application.connectToService("mojo:dart_echo", echoProxy);
+
+      var v = await echoProxy.ptr.echoString(null);
+      expect(v.value, equals(null));
+
+      var q = await echoProxy.ptr.echoString("quit");
+      expect(q.value, equals("quit"));
+    });
+  });
+}