Changes to how we handle fancy stacks:

pkg/unittest/lib/src/config.dart

 // Copyright (c) 2011, 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.
 
 part of unittest;
 
 // A custom failure handler for [expect] that routes expect failures
 // to the config.
 class _ExpectFailureHandler extends DefaultFailureHandler {
   Configuration _config;
@@ skipping 54 matching lines @@
     configureExpectFailureHandler(new _ExpectFailureHandler(this));
   }
   /**
    * Called as soon as the unittest framework becomes initialized. This is done
    * even before tests are added to the test framework. It might be used to
    * determine/debug errors that occur before the test harness starts executing.
    * It is also used to tell the vm or browser that tests are going to be run
    * asynchronously and that the process should wait until they are done.
    */
   void onInit() {
+    formatStacks = false;
     _receivePort = new ReceivePort();
     _postMessage('unittest-suite-wait-for-done');
   }
 
   /** Called as soon as the unittest framework starts running. */
   void onStart() {}
 
   /**
    * Called when each test starts. Useful to show intermediate progress on
    * a test suite. Derived classes should call this first before their own
@@ skipping 149 matching lines @@
   // Currently e.message works in dartium, but not in dartc.
   void handleExternalError(e, String message, [stack]) =>
       _reportTestError('$message\nCaught $e', stack);
 
   _postMessage(String message) {
     // In dart2js browser tests, the JavaScript-based test controller
     // intercepts calls to print and listens for "secret" messages.
     print(message);
   }
 }