如何使用NSubstitute來模擬一個懶惰的類

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);

上面的代碼拋出異常。

lazily-initialized類型沒有公共的無參數構造函數

我正在使用C＃4.0和NSubstitute 1.2.1

Answer 1

根據@ sanosdole的評論，我建議使用一個真正的Lazy實例來返回你的替代品。 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);