import { Test , TestingModule } from "@nestjs/testing" ; import { AppController } from "./app.controller" ; import { AppService } from "./app.service" ; describe ( "AppController" , ( ) => { let appController ; beforeEach ( async ( ) => { const app = await Test . createTestingModule ( { controllers : [ AppController ] , providers : [ AppService ] } ) . compile ( ) ; appController = app . get < AppController > ( AppController ) ; } ) ; describe ( "root" , ( ) => { it ( 'should return "Hello World!"' , ( ) => { expect ( appController . getHello ( ) ) . toBe ( "Hello World!" ) ; } ) ; } ) ; } ) ;