E2E tests với Supertest trong NestJS — setup và best practices?

// test/users.e2e-spec.ts
describe('Users (e2e)', () => {
  let app: INestApplication;

  beforeAll(async () => {
    const moduleFixture = await Test.createTestingModule({
      imports: [AppModule],
    })
    .overrideProvider(UsersService)  // Override real service
    .useValue(mockUsersService)
    .compile();

    app = moduleFixture.createNestApplication();
    app.useGlobalPipes(new ValidationPipe({ whitelist: true }));
    app.useGlobalFilters(new HttpExceptionFilter());
    await app.init();
  });

  afterAll(async () => {
    await app.close();
  });

  it('GET /users — returns users list', () => {
    return request(app.getHttpServer())
      .get('/users')
      .set('Authorization', `Bearer ${testToken}`)
      .expect(200)
      .expect(res => {
        expect(res.body.data).toBeInstanceOf(Array);
      });
  });
});