Rhino Mocks - 如何断言一个模拟方法被称为n次？

Install-Package Rhino.Mocks

public interface IRepository
{
    void Save(User user);
}

public class UserService
{
    private readonly IRepository _repository;

    public UserService(IRepository repository)
    {
        _repository = repository;
    }

    public void SaveUser(User user)
    {
        _repository.Save(user);
    }
}

[Test]
public void SaveUser_CalledTwice_SavesUserTwice()
{
    // Arrange
    var repository = MockRepository.GenerateMock<IRepository>();
    var userService = new UserService(repository);
    var user = new User { Id = 1, Name = "John Doe" };

    // Act
    userService.SaveUser(user);
    userService.SaveUser(user);

    // Assert
    repository.AssertWasCalled(x => x.Save(user), options => options.Repeat.Twice());
    repository.VerifyAllExpectations();
}