我如何断言在我的单元测试中调用了委托

Question

我希望根据演示者的检查结果调用正确的委托方法。

将我的 IdentityProvider 模拟为 return true，我将如何编写一个测试来断言 delegate?.userIsAuthenticated() 被调用？

import Foundation
import InjectStory

protocol StartPresenterDelegate: class {
    func userIsAuthenticated()
    func userNeedsToAuthenticate()
}

class StartPresenter {
    weak var delegate: StartPresenterDelegate?
    weak var view: StartViewInterface!

    private lazy var identityProvider = Dependencies.identityProvider.inject()

    init(view: StartViewInterface) {
        self.view = view
    }

    private func checkUserAuthState() {
        if identityProvider.isAuthorized() {
            delegate?.userIsAuthenticated()
        } else {
            delegate?.userNeedsToAuthenticate()
        }
    }

}

extension StartPresenter: StartPresentation {
    func onViewDidLoad() {
        checkUserAuthState()
    }
}

extension StartPresenter {
    struct Dependencies {
        static let identityProvider = Injection<IdentityProviderProtocol>(IdentityProvider.shared)
    }
}

Answer 1

你也必须如下模拟 StartPresenterDelegate。

class MockStartPresenterDelegate: StartPresenterDelegate {
   var userIsAuthenticated_wasCalled = false 

   func userIsAuthenticated() {
       userIsAuthenticated_wasCalled = true
   }
}

注入 MockStartPresenterDelegate 作为委托并检查 userIsAuthenticated_wasCalled 是否为真

Answer 2

你需要做点小动作。为您的协议创建 MockDelegateClass StartPresenterDelegate 示例：

class MockDelegate: StartPresenterDelegate {

    var isUserIsAuthenticatedCalled = false
    var isUserNeedsToAuthenticateCalled = false

    func userIsAuthenticated() {
        isUserIsAuthenticatedCalled = true
    }

    func userNeedsToAuthenticate() {
        isUserNeedsToAuthenticateCalled = true
    }
}

然后在你的测试中尝试做类似的事情：

func test_MyTest() {
    // init your class StartPresenter that you wanna test
    var presenter = StartPresenter(...)
    var mockDelegate = MockDelegate()
    presenter.delegate = mockDelegate
    presenter.onViewDidLoad()

    XCTAssertTrue(mockDelegate.isUserIsAuthenticatedCalled)
    XCTAssertFalse(mockDelegate.isUserNeedsToAuthenticateCalled)
    // or change isUserIsAuthenticatedCalled and isUserNeedsToAuthenticateCalled if you expect another states
}

对于不同的状态你需要不同的测试，对你来说这将是测试委托调用最简单的方法。

Answer 3

通过这种方式，您可以在 Swift 应用程序

中确认委托的单元测试

我如何断言在我的单元测试中调用了委托

How can I assert a delegate is called in my unit test

ios

xctest

swift