当我为一个正在工作的Ionic项目运行单元测试时，我从AppComponent得到了这个错误，它在两个单元测试中发生：
App component should create the app
TypeError: this.platform.is is not a function
和
App component should initialize the app
TypeError: this.platform.is is not a function
这是我的app.component.spec.ts的代码：
import { HttpClientTestingModule} from '@angular/common/http/testing';
import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { TestBed, async } from '@angular/core/testing';
import { Platform } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';
import { AppComponent } from './app.component';
import { NativeStorage } from '@ionic-native/native-storage/ngx';
import { Router } from '@angular/router';
import { NativeAudio } from '@ionic-native/native-audio/ngx';
import { Dialogs } from '@ionic-native/dialogs/ngx';
import { FCM } from '@ionic-native/fcm/ngx';
describe('AppComponent', () => {
let statusBarSpy, splashScreenSpy, platformReadySpy, platformSpy;
beforeEach(async(() => {
statusBarSpy = jasmine.createSpyObj('StatusBar', ['styleDefault']);
splashScreenSpy = jasmine.createSpyObj('SplashScreen', ['hide']);
platformReadySpy = Promise.resolve();
platformSpy = jasmine.createSpyObj('Platform', { ready: platformReadySpy });
TestBed.configureTestingModule({
imports: [ HttpClientTestingModule ],
declarations: [AppComponent],
schemas: [CUSTOM_ELEMENTS_SCHEMA],
providers: [
{ provide: StatusBar, useValue: statusBarSpy },
{ provide: SplashScreen, useValue: splashScreenSpy },
{ provide: Platform, useValue: platformSpy },
{ provide: NativeStorage },
{ provide: Router },
{ provide: NativeAudio },
{ provide: Dialogs },
{ provide: FCM }
],
}).compileComponents();
}));
it('should create the app', () => {
const fixture = TestBed.createComponent(AppComponent);
const app = fixture.debugElement.componentInstance;
expect(app).toBeTruthy();
});
it('should initialize the app', async () => {
TestBed.createComponent(AppComponent);
expect(platformSpy.ready).toHaveBeenCalled();
await platformReadySpy;
expect(statusBarSpy.styleDefault).toHaveBeenCalled();
expect(splashScreenSpy.hide).toHaveBeenCalled();
});
});这是可能导致错误的代码：
if (this.platform.is('cordova') || this.platform.is('desktop') || this.platform.is('mobile')) {
this.storageEngine = this.localStorage;
} else {
this.storageEngine = this.storage;
}
当我查找此错误时，我唯一能找到的解决方案是为Platform创建一个模拟对象，但是我已经有了一个。有人知道我如何能够解决此错误吗？
您的错误为您提供了答案。您已经准备好嘲笑，但是还没有嘲笑'is'函数。
试试这个。
platformSpy = jasmine.createSpyObj('Platform', { ready: platformReadySpy,
is: (type: string) => {
if (type === 'cordova' || type === 'desktop' || type === 'mobile') {
return true;
} else {
return false;
}
}
});
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