Swift 5中UNUserNotificationCenter .requestAuthorization的单元测试

Question

我正在使用Xcode和Swift的测试驱动开发来开发一个应用程序。

我想添加定时通知提醒人们回到应用程序执行一个动作。为此，我需要使用通知中心向我的用户请求授权。

为此，我希望在单元测试中编写一个测试，该测试仅在共享requestAuthorization(options:completionHandler:)实例调用其UNUserNotificationCenter方法时才通过。

我试过嘲笑UNUserNotificationCenter：

extension NotificationsExperimentsTests {

    class MockNotificationCentre: UNUserNotificationCenter {

        var didRequestAuthorization = false

        override func requestAuthorization(options: UNAuthorizationOptions = [], completionHandler: @escaping (Bool, Error?) -> Void) {
            didRequestAuthorization = true
        }
    }
}

但当我试着在测试中初始化它时，

func test_requestAuthorization_IsCalled() {

    var mockNotificationCenter = MockNotificationCentre()
}

编译器告诉我：

无法构造'NotificationsExperimentsTests.MockNotificationCentre‘，因为它没有可访问的初始化器。

我不知道下一步该做什么，或者我想做的事是否可能？

Answer 1

到目前为止我就在这里。感谢先前的答复：

Unit testing iOS 10 notifications

我的测试课：

import XCTest
import UserNotifications

@testable import NotificationsExperiments

class TestClass: XCTestCase {

    override func setUp() {
     super.setUp()
  }

  func testDoSomething() {
        //Given
        // Class being tested
        let exampleClass = ExampleClass()
        // Create your mock class.
        let mockNotificationCenter = MockNotificationCenter()
        exampleClass.notificationCenter = mockNotificationCenter
    //When
        exampleClass.doSomething()
        //Then
        XCTAssertTrue(mockNotificationCenter.didRequestAuthorization)
  }
}


extension TestClass {

    class MockNotificationCenter: MockUserNotificationCenterProtocol {

        var didRequestAuthorization = false

        func requestAuthorization(options: UNAuthorizationOptions, completionHandler: ((Bool, Error?) -> Void)) {
            didRequestAuthorization = true
        }
    }
}

我的示例类：

import Foundation
import UserNotifications

class ExampleClass {

    #if DEBUG
    var notificationCenter: MockUserNotificationCenterProtocol = UNUserNotificationCenter.current()
    #else
    var notificationCenter = UNUserNotificationCenter.current()
    #endif

    func doSomething() {
        let options: UNAuthorizationOptions = [.alert, .sound, .badge]
        notificationCenter.requestAuthorization(options) {
            (didAllow, error) in
            if !didAllow {
                print("User has declined notifications")
            }
        }
  }
}

#if DEBUG
protocol MockUserNotificationCenterProtocol: class {
    func requestAuthorization(options: UNAuthorizationOptions, completionHandler: ((Bool, Error?) -> Void))

}

extension UNUserNotificationCenter: MockUserNotificationCenterProtocol {
    func requestAuthorization(options: UNAuthorizationOptions, completionHandler: ((Bool, Error?) -> Void)) {
        print("Requested Authorization")
    }
}
#endif

这是可行的，但它不只是有点烦人。在调试模式下，它实际上不会发送授权请求，但在发布时会发送请求。

任何进一步的捐款都将欣然接受。