如何在单元测试Nest.js中测试抛出新的HttpException

import { Test, TestingModule } from '@nestjs/testing';
import { AppService } from './app.service';
import { HttpException } from '@nestjs/common';

describe('AppService', () => {
  let appService: AppService;

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

    appService = app.get<AppService>(AppService);
  });

  describe('yourTestFunction', () => {
    it('should throw HttpException', () => {
      expect(() => {
        appService.yourTestFunction();
      }).toThrow(HttpException);
    });
  });
});

import { Injectable, HttpException, HttpStatus } from '@nestjs/common';

@Injectable()
export class AppService {
  yourTestFunction() {
    throw new HttpException('Your error message', HttpStatus.BAD_REQUEST);
  }
}

$ npm run test