anchor.diff:        Tuneup tuneup = new Tuneup(logger);
         return tuneup.processArgs(['init'], directory: foo).then((_) {
           expect(new File('foo/bin/helloworld.dart').existsSync(), true);
  +        File other = new File('foo/bin/heyworld.dart');
  +        other.writeAsStringSync(_errorText);
         }).then((_) {
           return tuneup.processArgs(['stats'], directory: foo).then((_) {
  -          expect(logger.out, contains('1 source files, 3 lines of code.'));
  +          expect(logger.out, contains('2 source files, 6 lines of code'));
             expect(logger.err, isEmpty);
           });
         });
  
positive.code:       });
      });
  
      test('clean', () {
        Tuneup tuneup = new Tuneup(logger);
        return tuneup.processArgs(['init'], directory: foo).then((_) {
  
negative.code:         new Directory('foo/build').createSync();
          return tuneup.processArgs(['clean'], directory: foo);
        }).then((_) {
          expect(logger.out, contains('Deleting build'));
          expect(logger.err, isEmpty);
        });
  