我正在尝试测试使用Tape调用API的异步函数,但是我似乎运气不高。我以前用过Mocha / Chai和Jasmine,但不确定如何在这里做我想做的事情。

这是我要测试的功能

const logicGetMovies = async (genre, page) => {

  numCheck(genre, 'genre')
  numCheck(page, 'page')
  stringCheck(process.env.API_KEY,'process.env.API_KEY')

  const url = `https://api.themoviedb.org/3/discover/movie?with_genres=${genre}&api_key=${process.env.API_KEY}&page=${page}&sort_by=vote_average.desc`

  try {
    return await axios.get(url)
  } catch (e) {
    throw new APIError(e.message)
  }
}


它依赖于抛出APIErrors(我自己的Error类型)的两个帮助器函数

const numCheck = (num, name) => {
  if (!num) throw new APIError(`${name} is missing`)
  if (typeof num !== 'number' || num <= 0) throw new APIError(`${name} must be a number greater than 0`)
}

const stringCheck = (string, name) => {
  if (!string) throw new APIError(`${name} is missing`)
  if (typeof string !== 'string') throw new APIError(`${name} must be of type string`)
}


我已经尝试了这个Tape测试,但都失败了,没有发现错误

const test = require('tape')
const logic = require('../../logic')
const APIError = require('../../logic/APIError')

test('getMovies should throw error with missing genre',(t) =>{
  t.throws(logic.logicGetMovies(null,1),APIError,'genre is missing')

})


我尝试将其更改为async,但这无济于事。

const test = require('tape')
const logic = require('../../logic')
const APIError = require('../../logic/APIError')

test('getMovies should throw error with missing genre', async (t) => {
  t.throws(logic.logicGetMovies(null, 1), APIError, 'genre is missing')
  t.end()
})


显然我在这里迷路了。任何线索或答案将不胜感激!

最佳答案

async function永远不会抛出错误...

...它返回一个Promise可能会拒绝并显示错误。

因此,对返回的Promise进行测试,以验证其是否拒绝并出现预期的错误。

您需要使用add Promise support to tape之类的tape-promise

这是一个简化的示例:

const tape = require('tape');
const _test = require('tape-promise').default;
const test = _test(tape);

const func = async () => {
  throw new Error('the error');
};

test('should reject', async (t) => {
  await t.rejects(func(), Error, 'the error');  // Success!
});

关于node.js - 如何使用Tape测试异步函数抛出错误?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/55694819/

10-10 03:59