使用 chai 测试期间无法将错误与抛出匹配

debugcn 发表于 Dev

艾登·加拉格尔

我正在尝试编写一个测试用例来捕获错误“错误：请提供pitchWidth 和pitchHeight”。但是我似乎无法期望将投掷作为成功的测试。

代码：

mocha.describe('testValidationOfBadInputData()', function() {
mocha.it('init game fails on pitch height', async() => {
  let t1location = './init_config/team1.json'
  let t2location = './init_config/team2.json'
  let plocation = './test/input/badInput/badPitchHeight.json'
  // let badFn = await validation.initGame(t1location, t2location, plocation)

  expect(await validation.initGame(t1location, t2location, plocation)).to.throw()
}) })

输出：

1) testValidationOfBadInputData()
       init game fails on pitch height:
     Error: Please provide pitchWidth and pitchHeight
      at Object.validatePitch (lib/validate.js:56:11)
      at Object.initiateGame (engine.js:18:12)
      at Object.initGame (test/lib/validate_tests.js:9:29)

其他尝试也失败了：

expect(await validation.initGame(t1location, t2location, plocation)).to.throw(Error, 'Please provide pitchWidth and pitchHeight');

expect(await validation.initGame.bind(t1location, t2location, plocation)).to.throw();

不确定我做错了什么，文档似乎并不明显。https://www.chaijs.com/api/bdd/#method_throw

async function initGame(t1, t2, p) {       
  let team1 = await common.readFile(t1)       
  let team2 = await common.readFile(t2)       
  let pitch = await common.readFile(p)       
  let matchSetup = engine.initiateGame(team1, team2, pitch)     
 return matchSetup  
}

以上是我正在调用的函数。

艾登·加拉格尔

通过执行以下操作，我能够创建正确的测试：

 mocha.describe('testValidationOfBadInputData()', function() {
    mocha.it('init game fails on pitch height', async() => {
      let t1location = './init_config/team1.json'
      let t2location = './init_config/team2.json'
      let plocation = './test/input/badInput/badPitchHeight.json'
      try{
        await validation.initGame(t1location, t2location, plocation); 
      }catch(err){
        expect(err).to.be.an('Error');
        expect(err.toString()).to.have.string('Error: Please provide pitchWidth and pitchHeight')
      }
    })
  })

正如马特所描述的，我试图在期望的函数中调用该函数。这需要一个异步函数（因为我正在使用等待）但随后失败了