Karma单元测试中名为“ [DEFAULT]”的Firebase应用已存在app / duplicate-app错误

问题描述

我正在尝试为Angular / Firebase应用程序创建单元测试，但出现以下错误：

Uncaught Error in snapshot listener: FirebaseError: Missing or insufficient permissions.

FirebaseError: Firebase: Firebase App named '[DEFAULT]' already exists (app/duplicate-app).

以下是几个说明的示例：

import { async,ComponentFixture,Testbed } from '@angular/core/testing';
import { IonicModule } from '@ionic/angular';

import { ChatPage } from './chat.page';
import * as firebase from 'firebase/app';
import { firebaseConfig } from 'src/credentials/credentials';
firebase.initializeApp(firebaseConfig);

describe('ChatPage',() => {
  let component: ChatPage;
  let fixture: ComponentFixture<ChatPage>;

  beforeEach(async(() => {
    Testbed.configureTestingModule({
      declarations: [ ChatPage ],imports: [IonicModule.forRoot()]
    }).compileComponents();

    fixture = Testbed.createComponent(ChatPage);
    component = fixture.componentInstance;
    fixture.detectChanges();
  }));

  it('should create',() => {
    expect(component).toBeTruthy();
  });
});

这是我未添加firebaseInit的地方：

import { async,Testbed } from '@angular/core/testing';
import { IonicModule } from '@ionic/angular';
import { FormsModule,ReactiveFormsModule } from '@angular/forms';
import { RouterTestingModule } from '@angular/router/testing';

import { SignupPage } from './signup.page';

describe('SignupPage',() => {
  let component: SignupPage;
  let fixture: ComponentFixture<SignupPage>;

  beforeEach(async(() => {
    Testbed.configureTestingModule({
      declarations: [ SignupPage ],imports: [IonicModule.forRoot(),FormsModule,ReactiveFormsModule,RouterTestingModule]
    }).compileComponents();

    fixture = Testbed.createComponent(SignupPage);
    component = fixture.componentInstance;
    fixture.detectChanges();
  }));

  it('should create',() => {
    expect(component).toBeTruthy();
  });
});

在使用业力对FirebaseAngular应用进行单元测试时，我找不到任何示例或教程，所以我开枪了。

任何帮助将不胜感激。进行Firebase应用程序单元测试的设置步骤是什么？

解决方法

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