Test command with mockito

[EmadBeltaje]

Hello iam trying to mock my command for testing and iam having alot of problems so iam asking for a simple example for mocking command with mockito lets take this command from the your doc

class CommitCommand extends Command {
  final name = "commit";
  final description = "Record changes to the repository.";

  // [run] may also return a Future.
  void run() {
     if(commit()){
        exist(0);
     }else {
        exist(1);
     }
  }

  bool commit() => true;
}

how can i mock this and simulate if commit returned true or false simple example cause when iam trying to do it i faced alot of errors