ios - UNUserNotificationCenter unit tests -


i try test simple method supposed create , deliver notification ios 10. 

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) }

and here unit test of method:

func testdisplaynotification() {     notificationmanager?.displayplacenotificationcontent())     xctasserttrue((notificationmanager.isnotificationdisplayed()) }

when try execute unit test have exception, stacktrace:

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 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 ...

the responsible line failure supposed access of unusernotificationcenter current() method. don't see why? unusernotificationcenter supposed singleton, can't use in unit test context? supposed mock it?


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