anchor.diff:  }
   
   class LinkMock extends FileSystemEntity implements Link {
  +  String get path => "/mocklink";
  +
     LinkMock(String path);
   
     static createLink(String path) => new LinkMock(path);
  
positive.code: }
  
  class FileStatMock implements FileStat {
    final DateTime changed;
    final DateTime modified;
    final DateTime accessed;
    final FileSystemEntityType type;
    final int mode;
    final int size;
  
    FileStatMock();
  
  
negative.code:   void createSync(String target, {bool recursive: false}) {}
    void updateSync(String target) {}
    Future<Link> update(String target) => null;
    Future<bool> exists() => null;
    bool existsSync() => false;
    Future<String> resolveSymbolicLinks() => null;
    String resolveSymbolicLinksSync() => null;
    Future<Link> rename(String newPath) => null;
  