开玩笑“匹配器错误：期望值必须是一个函数”

Question

我正在使用带Jest的Nestjs，我会收到此错误：

匹配器错误：预期值必须是函数

...在单元测试之后运行时。

我已经将无效的电子邮件设置在模拟机体中。我在这里错过了什么吗？

app.service.ts

@Injectable()
export class UserService {
  constructor(private emailService: EmailService) {}

  async registerUserInquiry(user: UserDto): Promise<{ email: string }> {
    try {
      await sendEmail(user);
    } catch (error) {
      throw new HttpException('Something went wrong!', HttpStatus.BAD_REQUEST);
    }
    return {
      email: user.email,
    };
  }
}

app.service.service.spec.ts

describe("registerUser()", () => {
  it("Should throw bad request error when passing invalid data", async () => {
    const mockBody: UserDto = {
      name: "John Doe",
      message: "Example inquiry message",
      email: "@example",
      mobile: "+60121234567",
    };

    expect(async () => await service.registerUserInquiry(mockBody)).toThrow(
      new HttpException("Something went wrong!", HttpStatus.BAD_REQUEST)
    );
  });
});

email.config.ts

export const sendEmail = async (user: User) => {
  const transporter = nodemailer.createTransport({
    ... // service & auth
  });

  const options = {
   ... // email info
  };

  await transporter.sendMail(options, function (error, info) {
    try {
      console.info(error);
      return info;
    } catch (error) {
      console.error(error);
      throw error;
    }
  });
};

错误：

Answer 1

您的功能不是尝试此操作，而不是

expect(async () => await service.registerUserInquiry(mockBody)).toThrow(
  new HttpException("Something went wrong!", HttpStatus.BAD_REQUEST)
);

尝试此功能

await expect(service.registerUserInquiry(mockBody)).rejects.toThrowError(...)

，这意味着它没有丢弃错误，而是拒绝。

Answer 2

try {
    await service.registerUserInquiry(mockBody)
} catch(err) {
expect(err).toBeInstanceOf(BAD_REQUEST);
expect(err.message).toEqual{'Something went wrong!'}
}