Nestjs 存储库测试失败并出现错误“收到的承诺已解决而不是被拒绝”

Question

我正在为我的后端应用程序编写单元测试，我正在努力测试数据库中未找到的项目，这是我要测试的存储库的代码：

@EntityRepository(Collectible)
export class CollectibleRepository extends Repository<Collectible> {
  async getCollectible(id: number) {
    const collectible = await this.findOne(id);
    if (!collectible) {
      throw new NotFoundException();
    }
    return collectible;
  }
}

这是测试代码，我只展示这个测试用例。

const mockCollectible = new Collectible(
  faker.lorem.sentence(),
  faker.lorem.sentences(3),
  faker.datatype.float(),
  faker.datatype.float(),
  faker.datatype.number(),
);

describe('Collectible Repository', () => {
  let collectibleRepository: CollectibleRepository;

  beforeEach(async () => {
    const module = await Test.createTestingModule({
      providers: [CollectibleRepository],
    }).compile();

    collectibleRepository = module.get<CollectibleRepository>(
      CollectibleRepository,
    );
  });

  describe('View Collectibles', () => {
       it('throws and error as the collectible is not found', async (done) => {
      collectibleRepository.findOne = jest.fn().mockResolvedValue(undefined);
      await expect(collectibleRepository.getCollectible(1)).rejects.toThrow(
        NotFoundException,
      );
      done();
    });
  });
});

这会导致以下错误输出：

Expected message: not "Not Found"

       8 |     const collectible = await this.findOne(id, { relations: ['business'] });
       9 |     if (!collectible) {
    > 10 |       throw new NotFoundException();
         |             ^
      11 |     }
      12 |     return collectible;
      13 |   }

      at CollectibleRepository.getCollectibleBusiness (src/collectible/collectible.repository.ts:10:13)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:95012) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 3)
(node:95012) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
 FAIL  src/collectible/collectible.repository.spec.ts (8.525 s)
  ● Collectible Repository › View Collectibles › throws and error as the collectible is not found

    expect(received).rejects.not.toThrow()

    Received promise resolved instead of rejected
    Resolved to value: undefined

      39 |     it('throws and error as the collectible is not found', async (done) => {
      40 |       collectibleRepository.findOne = jest.fn().mockResolvedValue(undefined);
    > 41 |       await expect(collectibleRepository.getCollectible(1)).rejects.not.toThrow(
         |             ^
      42 |         NotFoundException,
      43 |       );
      44 |       done();

      at expect (../node_modules/expect/build/index.js:134:15)
      at Object.<anonymous> (collectible/collectible.repository.spec.ts:41:13)

我尝试使用this repository（在另一个 SO 线程中提到）和一组示例来测试 Nest.js 应用程序，但似乎没有直接测试存储库。

更新：我更新了我的代码，因为我的代码中缺少 await（如 Micael Levi 所述），我也调用了错误的函数（哈哈）。我收到以下警告：

(node:98378) UnhandledPromiseRejectionWarning: Error: expect(received).rejects.not.toThrow(expected)

虽然我可能会忽略它，除非它影响我的 CI 管道（我需要配置 lmao）

更新 2：警告是由另一个测试引起的（我现在可以休息了）。

Answer 1

你错过了const collectible = this.findOne(id);中的await

所以

const collectible = await this.findOne(id);