Angular 清理此组件时出错。\u app.unregisterRootNav不是NavControllerBase.destroy上的函数

我正在使用Karma jasmine测试一个页面，使用3个选项卡

当开始第二个测试用例时，出现错误。 如果我只写一个测试用例，就不会有错误

我遵循了这个答案，但没有帮助：

请帮忙

“@angular/core”：“5.2.11”

“@ionic native/core”：“^4.12.2”

“因果报应茉莉”：“^1.1.2”

ERROR:[36m'清理组件时出错'，对象{component:TabsPage{appCtrl:AppMock{}，平台：PlatformMock{resume:…}，firebase:FirebaseMock{}，translate:TranslateService{store:…、currentLoader:…、编译器：…、解析器：…、missingTranslationHandler:…、useDefaultLang:…、isolate:…、pending:…、onTranslationChange:…、onLangChange:…、onDefaultLangChange:…、langs:…、translationRequests:…、dataService:DataServiceProvider{toParentData Source:…，toChildDataSource:…，toParentData$：…，toChildData$：…}，common:CommonProviderLock{}，navCtrl:NavMock{}，rest:RestProviderLock{}，TokenProviderLock{}，tab1Root:function DrawalPage（navCtrl，common，rest，token，firebase，platform，loadingCtrl）{…，tab2Root:function TransactionPage（appCtrl，平台，公共，令牌，数据服务，rest，navCtrl）{…}，tab3Root:function AccountPage（appCtrl，平台，translate，firebase，公共，令牌，数据服务）{…}，resumeSub:Subscriber{closed:…，_parent:…，_parents:…，_subscriptions:…，syncErrorValue:…，SyncErrorSwitch:…，syncErrorThrowable:…，isStopped:…，destination:…}，dataServiceSub:Subscriber{closed:…，_parent:…，_parents:…，_subscriptions:…，syncErrorValue:…，SyncErrorSwitch:…，syncErrorThrowable:…，isStopped:…，destination:…}，firebaseSub:Subscriber{closed:…，_parent:…，_parents:…，_subscriptions:…，syncErrorValue:…，SyncErrorSwitch:…，syncErrorThrowable:…，isStopped:…，destination:…}，重试：0，选项卡：选项卡{u config:…，\u elementRef:…，\u renderer:…，\u component name:…，\u mode:…，viewCtrl:…，\u app:…，\u plt:…，\u linker:…，\u id:…，\u tabs:…，\u selectHistory:…，\u onstroy:…，ionChange:…，parent:…，id:，\u sbPadding:…，tabsHighlight:…，\u highlight:，\u highlight:，\u tabbar:…，portal:…}:，stacktrace:TypeError:this.\u app.unregisterRootNav不是函数
TypeError:此.\u app.unregisterRootNav不是函数
在Tab.NavControllerBase.destroy处(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:75720:23）
在Tab.Ngondestory(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:134069:14）
在callProviderLifecycles(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:13044:18）
在callElementProvidersLifecycles(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:13005:13）
在callLifecycleHooksChildrenFirst(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:12988:29）
俯瞰(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:14354:5）
在callViewAction(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:14505:13）
在执行组件视图操作时(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:14417:13）
俯瞰(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:14353:5）
在callWithDebugContext(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:15388:42）
在Object.debugDestroyView[作为destroyView](http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:14939:12）
在ViewRef.销毁(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:11958:18）
在ComponentRef.销毁(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:11622:33）
在ComponentFixture.destroy(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:29477:31）
在http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:30082:25
在Array.forEach（）处
在TestBed.resetTestingModule(http://localhost:9876/base/test-配置/卡玛测试垫片.js？a671f4c732cb1052c04ccc37ff945c825f9983dc:30080:30）
位于Function.TestBed.resetTestingModule

添加此代码

unregisterRootNav() {
  //do nothing
  return
}

对AppMock进行分类

ERROR: [36m'Error during cleanup of component', Object{component: TabsPage{appCtrl: AppMock{}, platform: PlatformMock{resume: ...}, firebase: FirebaseMock{}, translate: TranslateService{store: ..., currentLoader: ..., compiler: ..., parser: ..., missingTranslationHandler: ..., useDefaultLang: ..., isolate: ..., pending: ..., _onTranslationChange: ..., _onLangChange: ..., _onDefaultLangChange: ..., _langs: ..., _translations: ..., _translationRequests: ...}, dataService: DataServiceProvider{toParentDataSource: ..., toChildDataSource: ..., toParentData$: ..., toChildData$: ...}, common: CommonProviderMock{}, navCtrl: NavMock{}, rest: RestProviderMock{}, token: TokenProviderMock{}, tab1Root: function WithdrawalPage(navCtrl,common,rest,token,firebase,platform,loadingCtrl){ ... }, tab2Root: function TransactionsPage(appCtrl,platform,common,token,dataService,rest,navCtrl){ ... }, tab3Root: function AccountPage(appCtrl,platform,translate,firebase,common,token,dataService){ ... }, resumeSub: Subscriber{closed: ..., _parent: ..., _parents: ..., _subscriptions: ..., syncErrorValue: ..., syncErrorThrown: ..., syncErrorThrowable: ..., isStopped: ..., destination: ...}, dataServiceSub: Subscriber{closed: ..., _parent: ..., _parents: ..., _subscriptions: ..., syncErrorValue: ..., syncErrorThrown: ..., syncErrorThrowable: ..., isStopped: ..., destination: ...}, firebaseSub: Subscriber{closed: ..., _parent: ..., _parents: ..., _subscriptions: ..., syncErrorValue: ..., syncErrorThrown: ..., syncErrorThrowable: ..., isStopped: ..., destination: ...}, retry: 0, tabs: Tabs{_config: ..., _elementRef: ..., _renderer: ..., _componentName: ..., _mode: ..., viewCtrl: ..., _app: ..., _plt: ..., _linker: ..., _ids: ..., _tabs: ..., _selectHistory: ..., _onDestroy: ..., ionChange: ..., parent: ..., id: ..., _sbPadding: ..., tabsHighlight: ..., _highlight: ..., _tabbar: ..., portal: ...}}, stacktrace: TypeError: this._app.unregisterRootNav is not a function
TypeError: this._app.unregisterRootNav is not a function
    at Tab.NavControllerBase.destroy (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:75720:23)
    at Tab.ngOnDestroy (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:134069:14)
    at callProviderLifecycles (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:13044:18)
    at callElementProvidersLifecycles (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:13005:13)
    at callLifecycleHooksChildrenFirst (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:12988:29)
    at destroyView (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:14354:5)
    at callViewAction (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:14505:13)
    at execComponentViewsAction (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:14417:13)
    at destroyView (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:14353:5)
    at callWithDebugContext (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:15388:42)
    at Object.debugDestroyView [as destroyView] (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:14939:12)
    at ViewRef_.destroy (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:11958:18)
    at ComponentRef_.destroy (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:11622:33)
    at ComponentFixture.destroy (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:29477:31)
    at http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:30082:25
    at Array.forEach (<anonymous>)
    at TestBed.resetTestingModule (http://localhost:9876/base/test-config/karma-test-shim.js?a671f4c732cb1052c04ccc37ff945c825f9983dc:30080:30)
    at Function.TestBed.resetTestingModule 

unregisterRootNav() {
  //do nothing
  return
}