Unit Testing Basics

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Which API from @nestjs/testing do you use to assemble a module for testing a service and its dependencies?

javascript

import { Test } from '@nestjs/testing';
import { UserService } from './user.service';

const builder = Test.createTestingModule({
  providers: [UserService],
});

ANestFactory.create()

Bjest.createModule()

Cnew TestingModule()

DTest.createTestingModule({ providers })

After Test.createTestingModule({...}), what does await builder.compile() return?

javascript

import { TestingModule } from '@nestjs/testing';

const moduleRef: TestingModule = await Test.createTestingModule({
  providers: [UserService],
}).compile();

AThe raw metadata object you passed in

BA Jest mock of the module

CA running HTTP server

DA TestingModule instance with an initialized DI container you can pull providers from

How do you obtain the UserService instance from a compiled TestingModule for a standard singleton provider?

javascript

const service = moduleRef.get<UserService>(UserService);
expect(service).toBeDefined();

AmoduleRef.get(UserService)

BmoduleRef.find(UserService)

CmoduleRef.inject(UserService)

DmoduleRef.provider(UserService)

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