Function testHelper

packages/core/test/nest-application-context.spec.ts:15–57

(
    injectionKey: InjectionToken,
    scope: Scope,
    additionalProviders: Array<Provider> = [],
  )

  class A {}

  async function testHelper(
    injectionKey: InjectionToken,
    scope: Scope,
    additionalProviders: Array<Provider> = [],
  ): Promise<NestApplicationContext> {
    const nestContainer = new NestContainer();
    const injector = new Injector();
    const instanceLoader = new InstanceLoader(
      nestContainer,
      injector,
      new GraphInspector(nestContainer),
    );
    const { moduleRef } = (await nestContainer.addModule(class T {}, []))!;

    nestContainer.addProvider(
      {
        provide: injectionKey,
        useClass: A,
        scope,
      },
      moduleRef.token,
    );

    for (const provider of additionalProviders) {
      nestContainer.addProvider(provider, moduleRef.token);
    }

    nestContainer.addInjectable(
      {
        provide: injectionKey,
        useClass: A,
        scope,
      },
      moduleRef.token,
      'interceptor',
    );

    const modules = nestContainer.getModules();
    await instanceLoader.createInstancesOfDependencies(modules);

    const applicationContext = new NestApplicationContext(nestContainer);
    return applicationContext;
  }

  describe('listenToShutdownSignals', () => {
    it('shutdown process should not be interrupted by another handler', async () => {