Fix a bunch of pub tests that started running "pub get".

test/dart2js/ignores_non_entrypoint_dart_files_test.dart

 // Copyright (c) 2013, 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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
@@ skipping 15 matching lines @@
         output: new RegExp(r'Built 0 files to "build".'));
 
     d.dir(appPath, [
       d.dir('build', [
         d.nothing('web')
       ])
     ]).validate();
   });
 
   integration("serve ignores non-entrypoint Dart files", () {
-    pubServe();
+    pubServe(shouldGetFirst: true);
     requestShould404("file1.dart.js");
     requestShould404("file2.dart.js");
     requestShould404("file3.dart.js");
     requestShould404("file4.dart.js");
     endPubServe();
   });
 
 }