anchor.diff:                     [Function onDone = null]) {
       doTest = onTest;
       doDone = (onDone != null) ? onDone : (() => null);
  -    
  +
       if (configuration['component'] != 'dartc') {
         // Do nothing.  Asynchronously report that the suite is enqueued.
         new Timer((timerUnused){ doDone(); }, 0);
  
positive.code: 
  class TestUtils {
    static String get executableSuffix() =>
        (new Platform().operatingSystem() == 'windows') ? '.exe' : '';      
  
    static String executableName(Map configuration) {
      String postfix = executableSuffix;
  
negative.code:     if (!isLibraryDefinition && optionsFromFile['containsSourceOrImport']) {
        print('Warning for $filename: Browser tests require #library ' +
              'in any file that uses #import or #source');
      }
  
      final String component = configuration['component'];
      final String testPath = new File(filename).fullPathSync();
  