Fix tests and analysis warnings and release 0.12.0-beta.9.

test/runner/browser/chrome_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn("vm")
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:test/test.dart';
 import 'package:test/src/runner/browser/chrome.dart';
 import 'package:test/src/util/io.dart';
 import 'package:shelf/shelf.dart' as shelf;
 import 'package:shelf/shelf_io.dart' as shelf_io;
 import 'package:shelf_web_socket/shelf_web_socket.dart';
 
+import '../../utils.dart';
+
 void main() {
   group("running JavaScript", () {
     // The JavaScript to serve in the server. We use actual JavaScript here to
     // avoid the pain of compiling to JS in a test
     var javaScript;
 
     var servePage = (request) {
       var path = request.url.path;
 
       // We support both shelf 0.5.x and 0.6.x. The former has a leading "/"
@@ skipping 46 matching lines @@
 webSocket.addEventListener("open", function() {
   webSocket.send("loaded!");
 });
 ''';
       var chrome = new Chrome(baseUrlForAddress(server.address, server.port));
 
       return webSockets.first.then((webSocket) {
         return webSocket.first.then(
             (message) => expect(message, equals("loaded!")));
       }).whenComplete(chrome.close);
-    });
+    },
+        // It's not clear why, but this test in particular seems to time out
+        // when run in parallel with many other tests.
+        timeout: new Timeout.factor(2));
 
     test("doesn't preserve state across runs", () {
       javaScript = '''
 localStorage.setItem("data", "value");
 
 var webSocket = new WebSocket(window.location.href.replace("http://", "ws://"));
 webSocket.addEventListener("open", function() {
   webSocket.send("done");
 });
 ''';
@@ skipping 34 matching lines @@
     return shelf_io.serve(expectAsync((_) {}, count: 0), 'localhost', 0)
         .then((server) {
       var chrome = new Chrome(baseUrlForAddress(server.address, server.port));
       return chrome.close().whenComplete(server.close);
     });
   });
 
   test("reports an error in onExit", () {
     var chrome = new Chrome("http://dart-lang.org",
         executable: "_does_not_exist");
-    expect(chrome.onExit, throwsA(new isInstanceOf<ProcessException>()));
+    expect(chrome.onExit, throwsA(isApplicationException(startsWith(
+        "Failed to start Chrome: No such file or directory"))));
   });
 }