Add flag to disable capturing stack traces.

utils/tests/pub/pub_uploader_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.
 
 library pub_uploader_test;
 
 import 'dart:io';
 import 'dart:json' as json;
 
 import 'package:scheduled_test/scheduled_process.dart';
@@ skipping 17 matching lines @@
     ''';
 
 ScheduledProcess startPubUploader(ScheduledServer server, List<String> args) {
   var tokenEndpoint = server.url.then((url) =>
       url.resolve('/token').toString());
   args = flatten(['uploader', '--server', tokenEndpoint, args]);
   return startPub(args: args, tokenEndpoint: tokenEndpoint);
 }
 
 main() {
+  initConfig();
   group('displays usage', () {
     integration('when run with no arguments', () {
       schedulePub(args: ['uploader'],
           output: USAGE_STRING, exitCode: 64);
     });
 
     integration('when run with only a command', () {
       schedulePub(args: ['uploader', 'add'],
           output: USAGE_STRING, exitCode: 64);
     });
@@ skipping 126 matching lines @@
     server.handle('DELETE', '/packages/pkg/uploaders/email.json', (request) {
       request.response.write("{not json");
       request.response.close();
     });
 
     expect(pub.nextErrLine(), completion(equals('Invalid server response:')));
     expect(pub.nextErrLine(), completion(equals('{not json')));
     pub.shouldExit(1);
   });
 }