anchor.diff:      test('format()', () async {
         var hitmap = await _getHitMap();
   
  -      var resolver = new Resolver(packageRoot: 'packages');
  +      var resolver = new Resolver(packagesPath: '.packages');
         var formatter = new PrettyPrintFormatter(resolver, new Loader());
   
         String res = await formatter.format(hitmap);
  
positive.code:     test('format() excludes files not in reportOn list', () async {
        var hitmap = await _getHitMap();
  
        var resolver = new Resolver(packageRoot: 'packages');
        var formatter = new LcovFormatter(resolver, reportOn: ['lib/']);
  
        String res = await formatter.format(hitmap);
  
negative.code:     test('format() includes files in reportOn list', () async {
        var hitmap = await _getHitMap();
  
        var resolver = new Resolver(packagesPath: '.packages');
        var formatter = new PrettyPrintFormatter(resolver, new Loader(),
            reportOn: ['lib/', 'test/']);
  
  