Testing firestore with jest not working as expected - node.js

Question

I have the following service which I just need to test that whenever an user is not validated, we throw an error
async payoutPendingRewards(userId: string): Promise<Reward[]> {
const db = admin.firestore();
const userRef = db.collection('UserProfiles').doc(userId);
const doc = await userRef.get();
if (!doc.data() || !doc.data().validated) {
throw Error('User profile has not been validated');
}
const userBankAccount = await this.getUserPayoutAccount(userId);
if (userBankAccount) {
const pendingRewards = await this.getPendingRewards(userId);
const amount = pendingRewards.reduce(
(amount, reward) => amount + reward.amount,
0,
);
if (amount > 0) {
try {
const payoutId = await this.createPayout(
userBankAccount.accountType,
userBankAccount.accountId,
amount,
);
if (payoutId) {
// TODO: add payout ID to Reward
return await this.updatePendingRewards(pendingRewards);
}
} catch (e) {
throw new HttpException(
{
status: HttpStatus.INTERNAL_SERVER_ERROR,
message: 'There was an error: Payout Not Created',
},
HttpStatus.INTERNAL_SERVER_ERROR,
);
}
}
}
When trying to test it using jest, I can't get to mock the firebase-admin functions. I get a firebase error when trying to do it
import { Test, TestingModule } from '#nestjs/testing';
import { HttpModule, HttpService } from '#nestjs/axios';
import { describe, expect, beforeEach, it, jest } from '#jest/globals';
import { INestApplication, forwardRef } from '#nestjs/common';
import { SecretManagerServiceClient } from '#google-cloud/secret-manager';
import * as request from 'supertest';
import { RewardsService } from '../src/rewards/rewards.service';
import { RewardsController } from '../src/rewards/rewards.controller';
import { UsersModule } from '../src/users/users.module';
import { FirebaseAuthGuard } from '../src/auth/firebase-auth.guard';
import { HttpExceptionFilter } from '../src/exceptions/http-exception.filter';
import { TransformInterceptor } from '../src/interceptors/transform.interceptor';
import { firestore } from './setupFirestoreTests';
describe('RewardsService', () => {
let service: RewardsService;
let httpService: HttpService;
let app: INestApplication;
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
providers: [RewardsService],
controllers: [RewardsController],
imports: [
FirebaseAuthGuard,
HttpExceptionFilter,
TransformInterceptor,
HttpModule,
forwardRef(() => UsersModule),
],
}).compile();
app = module.createNestApplication();
service = module.get<RewardsService>(RewardsService);
httpService = module.get<HttpService>(HttpService);
await app.init();
});
afterEach(() => {
jest.restoreAllMocks();
});
it('should be defined', () => {
expect(service).toBeDefined();
});
it('makes a call to firestore', async () => {
service.payoutPendingRewards('123');
expect(firestore().doc().get).toHaveBeenCalledWith('123');
});
});
I need help just mocking the firebase functions. Already tried by creating mock functions on a different file but it didn't work