我尝试测试一个应该为iOS 10创建和发送通知的简单方法。
func displayPlaceNotificationContent() {
let unMutableNotificationContent = generateNotification()
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 1, repeats: false)
let request = UNNotificationRequest(identifier: getNotificationIdentifier(), content: unMutableNotificationContent, trigger: trigger)
let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.add(request, withCompletionHandler: nil)
}
以下是此方法的单元测试：
func testDisplayNotification() {
notificationManager?.displayPlaceNotificationContent())
XCTAssertTrue((notificationManager.isNotificationDisplayed())
}
当我尝试执行单元测试时，我有一个例外，即栈跟踪：
2017-09-12 13:52:25.931564+0200 xctest[17170:1252988] *** Assertion failure in -[UNUserNotificationCenter initWithBundleProxy:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UserNotifications_Sim/UserNotifications-156/UNUserNotificationCenter.m:50
2017-09-12 13:52:25.933629+0200 xctest[17170:1252988] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: bundleProxy != nil'
*** First throw call stack:
(
0 CoreFoundation 0x000000010b0a9aeb __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010aa0cf41 objc_exception_throw + 48
2 CoreFoundation 0x000000010b0aebb2 +[NSException raise:format:arguments:] + 98
3 Foundation 0x000000010a381d06 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 193
4 UserNotifications 0x000000010bff8c99 -[UNUserNotificationCenter initWithBundleProxy:] + 297
5 UserNotifications 0x000000010bff8a6f __53+[UNUserNotificationCenter currentNotificationCenter]_block_invoke + 81
6 libdispatch.dylib 0x0000000111a39475 _dispatch_client_callout + 8
7 libdispatch.dylib 0x0000000111a3a909 dispatch_once_f + 55
8 UserNotifications 0x000000010bff8a1b +[UNUserNotificationCenter currentNotificationCenter] + 45
...
由于current（）方法，此失败的责任行应该是UNUserNotificationCenter的访问权限。我不明白为什么？ UNUserNotificationCenter应该是一个单例，我不能在单元测试环境中使用它吗？我应该嘲笑它吗？