我在
swift工作,我想刷新一个页面,所以我使用通知发送它,我在一个ViewController中发布通知并在另一个中添加观察者,它工作正常.我想要做的是在swift中添加单元测试.我查了很多网站但是没能做到.我是新手,不知道从哪里开始.
基本上工作是,当我点击按钮通知被发布时,并且当加载下一个视图控制器时,添加通知观察者.
我该怎么做单元测试
提前致谢
编辑：
码
NSNotificationCenter.defaultCenter().postNotificationName("notificationName",object: nil)
并添加观察者
NSNotificationCenter.defaultCenter().addObserver(self,selector: "vvv:",name:"notificationName",object: nil)
解决方法
一般的解决方案是：使用依赖注入(DI)使您的组件可单元测试.您可以选择使用DI框架(我不知道Swift是否存在任何良好的框架)或使用本机方法(即传递对象)
解决问题的一种可能方法是包装NSNotificationCenter以使其可模拟/可注入.
这只是一个基本的想法,你可以如何解耦依赖.请不要只复制&粘贴下面的代码并期望它在不理解它的情况下工作.
import Foundation
protocol NotificationCenter {
func postNotificationName(name: String,object: AnyObject?)
// you can make it take the arguments as NSNotificationCenter.addObserver
func addObserver(callback: AnyObject? -> Void)
}
class MyNotificationCenter : NotificationCenter {
var _notificationCenter: NSNotificationCenter
init(_ center: NSNotificationCenter) {
_notificationCenter = center
}
func postNotificationName(name: String,object: AnyObject?) {
// call NSNotificationCenter.postNotificationName
}
func addObserver(callback: AnyObject? -> Void) {
// call NSNotificationCenter.addObserver
}
}
class MockNotificationCenter : NotificationCenter {
var postedNotifications: [(String,AnyObject?)] = []
var observers: [AnyObject? -> Void] = []
func postNotificationName(name: String,object: AnyObject?) {
postedNotifications.append((name,object))
}
func addObserver(callback: AnyObject? -> Void) {
observers.append(callback)
}
}
class MyView {
var notificationCenter: NotificationCenter
init(notificationCenter: NotificationCenter) {
self.notificationCenter = notificationCenter
}
func handleAction() {
self.notificationCenter.postNotificationName("name",object: nil)
}
}
class MyController {
var notificationCenter: NotificationCenter
init(notificationCenter: NotificationCenter) {
self.notificationCenter = notificationCenter
}
func viewDidLoad() {
self.notificationCenter.addObserver {
println($0)
}
}
}
// production code
// in AppDeletate.applicationDidFinishLaunching
let notificationCenter = MyNotificationCenter(NSNotificationCenter.defaultCenter())
// pass it to your root view controller
let rootViewController = RootViewController(notificationCenter: notificationCenter)
// or
rootViewController.notificationCenter = notificationCenter
// in controller viewDidLoad
self.myView.notificationCenter = self.notificationCenter
// when you need to create controller
// pass notificationCenter to it
let controller = MyController(notificationCenter: notificationCenter)
// in unit test
func testMyView() {
let notificationCenter = MockNotificationCenter()
let myView = MyView(notificationCenter: notificationCenter)
// do something with myView,assert correct notification is posted
// by checking notificationCenter.postedNotifications
}
func testMyController() {
let notificationCenter = MockNotificationCenter()
let myController = MyController(notificationCenter: notificationCenter)
// assert notificationCenter.observers is not empty
// call it and assert correct action is performed
}
