import { Test, TestingModule } from '@nestjs/testing'; import { AppController } from './app.controller'; import { AppService } from './app.service'; describe('AppController', () => { let app: TestingModule; beforeAll(async () => { app = await Test.createTestingModule({ controllers: [AppController], providers: [AppService], }).compile(); }); describe('getData', () => { it('should return "Welcome to api!"', () => { const appController = app.get(AppController); expect(appController.getData()).toEqual({ message: 'Welcome to api!' }); }); }); });