Question

我很难测试我的代码中的错误是否成功抛出了正确的消息。发生的事情是错误是正确抛出但是我的测试失败了。

模块：

// users.ts
const database = require('../databases/postgres');

module.exports = {
  create: async (req, res, next) => {
    try {
        if (!req.body.email) {
            throw new Error('email needed');
        }

        const userCreated = await database.createUser(user);

        userCreated ? res.status(200).send('success') : res.status(409).send('user already exists');
    } catch(err) {
        next(err);
    }
  }
}

测试：

// users.test.ts
const expect = require('chai').expect;
const users = require('./users');

describe('create()', () => {
    it('should send an error if the user does not have an email', (done) => {
        const fakeReq = {
            body: {
                password: 'abc'
            }
        };
        const fakeRes = {};

        expect(() => {
            users.create(fakeReq, fakeRes, done)
        }).to.throw(Error, 'email needed')
    });
});

我对这个问题感到慌乱，不确定我的测试，chai /打字稿是不兼容的，还是我尝试使用async / await？我感谢任何帮助。

Answer 1

Vayrex的评论让我走上了正确的道路。我从try / catch块中移出了抛出的错误，我也继续使用Chai的chai-as-promise模块。以下是为我制定的代码示例。

// users.ts
module.exports = {
    create:  async (req, res, next) => {
        if (!userInput.email) {
            throw new Error('email needed');
        }

        try {
            const userCreated = await database.createUser(user);

            userCreated ? res.status(200).send('success') : res.status(409).send('user already exists');
        }
        catch(err) {
            next(err);
        }
    }
};

规格

// users.test.ts
const expect = require('chai').expect;
const users = require('./users');
const chaiAsPromised = require("chai-as-promised");

require('chai').use(chaiAsPromised);

describe('create()', () => {
    it('should send an error if the user does not have an email', (done) => {
        const fakeReq = {
            body: {
                password: 'abc'
            }
        };
        const fakeRes = {};

        return expect(users.create(fakeReq, fakeRes)).to.be.rejectedWith(Error, 'email needed');
    });
});

Chai测试TypeScript抛出的错误消息

1 个答案: