如何使用NSubstitute来模拟一个懒惰的类

Question

//Assert
Lazy<INotificationService> notificationService = Substitute.For<Lazy<INotificationService>>();
Service target = new Service(repository, notificationService);

//Act
target.SendNotify("Message");

//Arrange
notificationService.Received().Value.sendNotification(null, null, null, null);

上面的代码抛出异常。

lazily-initialized类型没有公共的无参数构造函数

我正在使用C＃4.0和NSubstitute 1.2.1

Answer 1

根据@ sanosdole的评论，我建议使用一个真正的Lazy实例来返回你的替代品。 就像是：

var notificationService = Substitute.For<INotificationService>();
var target = new Service(repository, new Lazy<INotificationService>(() => notificationService));

target.SendNotify("Message");

notificationService.ReceivedWithAnyArgs().sendNotification(null, null, null, null);