ApiCore/ApiCore-Backend/test/utils/create-test-app.ts

import { Test, TestingModule } from '@nestjs/testing';
import { INestApplication } from '@nestjs/common';
import { App } from 'supertest/types';
import { AppModule } from '../../src/app.module';
import { configureApp } from '../../src/app.config';

export async function createTestApp(): Promise<INestApplication<App>> {
  const moduleFixture: TestingModule = await Test.createTestingModule({
    imports: [AppModule],
  }).compile();

  const app = moduleFixture.createNestApplication<INestApplication<App>>();
  configureApp(app);
  await app.init();
  return app;
}