class MockView extends Mock implements ContactListViewContract {

  @override
  void onLoadContactsComplete(List<Contact> items) {

  }
  @override
  void onLoadContactsError() {}

}

void main() {

  test('ContactListPresenter test', () {
    Injector.configure(Flavor.MOCK);
    MockView view = new MockView();

    ContactListPresenter presenter = new ContactListPresenter(view);

    presenter.loadContacts();

    verify(view.onLoadContactsComplete).called(1);

  });

}

我想确认从代码中调用presenter.loadContacts()的时间，然后验证是否也调用了view.onLoadContactsComplete，但得到一个错误：
用于非mockito对象
有没有可能和Mockito这样做？
更新：

abstract class ContactListViewContract {
  void onLoadContactsComplete(List<Contact> items);
  void onLoadContactsError();
}

这里调用onLoadContactsComplete方法

class ContactListPresenter {
  ContactListViewContract _view;
  ContactRepository _repository;

  ContactListPresenter(this._view){
    _repository = new Injector().contactRepository;
  }

  void loadContacts(){
    assert(_view != null);

    _repository.fetch()
        .then((contacts) {
          print(contacts);
          _view.onLoadContactsComplete(contacts); // here the onLoadContactsComplete method is called
        }).catchError((onError) {
          print(onError);
          _view.onLoadContactsError();
        });
  }

}

模拟存储库。获取模拟数据。

class MockContactRepository implements ContactRepository{

  Future<List<Contact>> fetch(){
    return new Future.value(kContacts);
  }

}