app-new/factory-email/test/email.spec.ts

import { Test, TestingModule } from '@nestjs/testing';
import { EmailModule } from '../src/email/email.module';
import { EmailService } from '../src/email/email.service';

describe('EmailService', () => {
  let service: EmailService;

  beforeEach(async () => {
    const module: TestingModule = await Test.createTestingModule({
      providers: [EmailService],
      imports:[EmailModule]
    }).compile();

    service = module.get<EmailService>(EmailService);
  });

  it('should send email with provider subject receiver text and response 200 status', async () => {

    const subject = 'Test'
    const text='How are you'
    const receiver = 'mgtstackoverflow@gmail.com'
   await service.sendEmailCode({receiver,subject,content: text}).then((resout)=>{
    expect(resout).toStrictEqual({ code: 200, message: 'success' });
    })
  });
});