node.js - Firebase 单元测试 : The default Firebase app does not exist

Question

我尝试模拟我的 Firebase 应用程序，但在某种程度上，我找不到使其工作的解决方案，并且 Firebase 文档中没有示例可以实现这一点。

在我的代码中，我有这个方法调用来初始化 firebase:

ServiceAccount 可以是 JSON 路径或来自用于测试目的的 ENV 设置的字符串

initialize(): void {
    if (!fs.existsSync(this.serviceAccount) && this.serviceAccount) {
        this.serviceAccount = JSON.parse(this.serviceAccount);
    }
    firebaseAdmin.initializeApp({
        credential: firebaseAdmin.credential.cert(this.serviceAccount),
        databaseURL: this.url
    });
    firebaseAdmin.auth();
    firebaseAdmin.database.enableLogging(true);
    this.database = firebaseAdmin.database();
}

然后在我的测试中，写道:

certStub = sinon.stub(admin.credential, 'cert').returns('');
firebaseAdminInitStub = sinon.stub(admin, 'initializeApp');
authStub = sinon.stub(admin, 'auth')

firebaseDatabaseStub = sinon.stub(admin, 'database');
firebaseDatabaseStub.get(() => (() => ({ref: refStub})));
refStub.withArgs(FirebaseContact.ref).returns({push: pushStub});
pushStub.withArgs(Contact).returns(Promise.resolve({ref: 'new_ref'}));

// Initialize it for the coming test
firebase.initialize();

基本上，我主要使用他们的代码来进行实时数据库使用，但是对于身份验证部分，它给了我错误:

The default Firebase app does not exist. Make sure you call initializeApp() before using any of the Firebase services.

投入:

firebaseAdmin.auth();

Exception:
at FirebaseAppError.FirebaseError [as constructor] (node_modules/firebase-admin/lib/utils/error.js:39:28)
addressBook.app_test |       at FirebaseAppError.PrefixedFirebaseError [as constructor] (node_modules/firebase-admin/lib/utils/error.js:85:28)
addressBook.app_test |       at new FirebaseAppError (node_modules/firebase-admin/lib/utils/error.js:119:28)
addressBook.app_test |       at FirebaseNamespaceInternals.Object.<anonymous>.FirebaseNamespaceInternals.app (node_modules/firebase-admin/lib/firebase-namespace.js:105:19)
addressBook.app_test |       at FirebaseNamespace.Object.<anonymous>.FirebaseNamespace.app (node_modules/firebase-admin/lib/firebase-namespace.js:372:30)
addressBook.app_test |       at FirebaseNamespace.Object.<anonymous>.FirebaseNamespace.ensureApp (node_modules/firebase-admin/lib/firebase-namespace.js:388:24)
addressBook.app_test |       at FirebaseNamespace.fn (node_modules/firebase-admin/lib/firebase-namespace.js:268:30)
addressBook.app_test |       at Firebase.initialize (src/firebase/firebase.ts:29:23)
addressBook.app_test |       at Object.done (src/tests/api/contact.test.ts:43:18)

据我所知，应该调用 initializeApp 来创建应用程序，但由于它已经 stub (根据示例)，它可以创建一个应用程序。那么我应该尝试 stub auth 部分还是以不同的方式使用 initializeApp ？

有什么想法吗？ :(

Answer 1

为了使其工作，我必须重构我的初始化方法并将配置移出:

initialize(): void {
    if (!fs.existsSync(this.serviceAccount) && this.serviceAccount) {
        this.serviceAccount = JSON.parse(this.serviceAccount);
    }
    firebaseAdmin.initializeApp(this.getConfig());
    firebaseAdmin.auth();
    this.database = firebaseAdmin.database();
}

getConfig(): Object {
    return {
        credential: firebaseAdmin.credential.cert(this.serviceAccount),
        databaseURL: this.url
    };
}

然后，我能够像在 firebase 示例中使用的那样对 getConfig 进行 stub ，但无需对 initializeApp 进行 stub (它无法使用)，这是我的 beforeAll:

getConfigStub = sinon.stub(firebase, 'getConfig');
getConfigStub.callsFake(() => {});
getConfigStub.returns({
    firebase: {
        databaseURL: 'https://not-a-project.firebaseio.com',
        storageBucket: 'not-a-project.appspot.com',
    }
});

firebaseDatabaseStub = sinon.stub(admin, 'database');
firebaseDatabaseStub.get(() => (() => ({ref: refStub})));
refStub.withArgs(FirebaseContact.ref).returns({push: pushStub});

我的 firebase 变量可能会让您认为它来自包的导入，但事实并非如此。这是我的 Firebase 类，用于包装我的逻辑。请参阅:

import * as fs from 'fs';
import * as firebase from 'firebase';
import * as firebaseAdmin from 'firebase-admin';

import { FirebaseInterface } from './firebaseInterface';

export class Firebase implements FirebaseInterface {
    private database: firebaseAdmin.database.Database;

    /**
     * Constructor
     * @param {string} serviceAccount
     * @param {string} url
     */
    constructor(private serviceAccount: string, private url: string) {}

    /**
     * Initialize connection
     * @returns {firebase.database.Reference}
     */
    initialize(): void {
        if (!fs.existsSync(this.serviceAccount) && this.serviceAccount) {
            this.serviceAccount = JSON.parse(this.serviceAccount);
        }
        firebaseAdmin.initializeApp(this.getConfig());
        firebaseAdmin.auth();
        this.database = firebaseAdmin.database();
    }

    getConfig(): Object {
        return {
            credential: firebaseAdmin.credential.cert(this.serviceAccount),
            databaseURL: this.url
        };
    }

    /**
     * Get ref
     * @returns {firebase.database.Reference}
     */
    getDatabase(): firebaseAdmin.database.Database {
        return this.database;
    }
}