EasyDrop

喔喔，好像有懂了，剛剛回頭看一篇之前講  swift mock 的，發現這個圖跟文章說的道理真的是一樣
https://academy.realm.io/posts/tryswift-veronica-ray-real-world-mocking-swift/

Stub : Fakes a response to method calls of an object 只是藉著 getVideoFor() 但最終不是要測它
class StubTimeMachineAPI: TimeMachineAPI {
    var videoUrl = "https://www.youtube.com/watch?v=SQ8aRKG9660"

    func getVideoFor(year: Int) -> String {
        return videoUrl
    }
}

Mocks:  Let you check if a method call is performed or if a property is set 最後是要測 timeTravelWasCalled 的值沒錯
class MockTimeMachine: TimeMachine {
    var timeTravelWasCalled = false

    mutating func timeTravelTo(year: Int) {
        timeTravelWasCalled = true
    }
}