如何使用sinon正确地存根和测试函数

时间:2016-07-07 19:16:30

标签: javascript node.js mocha sinon

我有这个接受cookie并返回有效用户的基本方法

const getInitialState = (id_token) => {
  let initialState;
  return new Promise((resolve,reject) => {
    if(id_token == null){
      initialState = {userDetails:{username: 'Anonymous',isAuthenticated: false}}
      resolve(initialState)
    }else{
        var decoded = jwt.verify(JSON.parse(id_token),'rush2112')
        db.one('SELECT  * FROM account WHERE account_id = $1',decoded.account_id)
          .then(function(result){
            initialState = {userDetails:{username:result.username,isAuthenticated:true}}
            resolve(initialState)
          })
          .catch(function(err){
            console.log('There was something wrong with the token')
            reject('There was an error parsing the token')
          })
    }
  })
}

因为这是一个承诺 - 我正在使用chaiAspromised。

我能够使用以下

成功测试第一个条件(cookie未预设)
  it('should return anonymous user if id_token isnt preset',function(){
    let id_token = null
    return expect(getInitialState(id_token)).to.eventually.have.deep.property('userDetails.username','Anonymous')
  })

然而,我不能/不太确定如何测试第二部分因为它依赖于jwt和外部db调用(它本身是另一个promise对象)

到目前为止我已经尝试过了。对数据库调用进行存根操作会返回此错误,我发现这个错误非常模糊

 1) GetInitialState should return a valid user if id_token is valid:
     TypeError: Cannot redefine property: connect
      at Function.defineProperty (native)
      at Object.wrapMethod (node_modules/sinon/lib/sinon/util/core.js:128:24)
      at stub (node_modules/sinon/lib/sinon/stub.js:67:26)
      at node_modules/sinon/lib/sinon/stub.js:60:25
      at node_modules/sinon/lib/sinon/walk.js:28:30
      at Array.forEach (native)
      at walkInternal (node_modules/sinon/lib/sinon/walk.js:23:45)
      at Object.walk (node_modules/sinon/lib/sinon/walk.js:49:20)
      at Object.stub (node_modules/sinon/lib/sinon/stub.js:52:23)
      at Context.<anonymous> (getInitialState.spec.js:27:11)

我想它不允许我存根整个db对象。我怎么能接近这个?我只想要jwt和db调用都不会抛出任何错误。我只是测试如果cookie是valie

,是否发送了适当的对象
  it('should return a valid user if id_token is valid',function(){
    sinon.stub(jwt,'verify').returns({username:foo});
    sinon.stub(db).resolves() // unsure of what to do here
    id_token = ' Foo----bar '
    return expect(getInitialState(id_token)).to.eventually.be.true
  })

2 个答案:

答案 0 :(得分:3)

你需要覆盖一些pg-promises默认值来覆盖特定方法

特别是通过

设置noLocking = true
const pgp = require('pg-promise')({noLocking:true})

<强>更新

来自pg-promise作者。这是正确的方法。请参阅选项noLocking

  

如果此规定妨碍了为您的测试使用模型框架,则可以通过在选项中设置noLocking = true来强制库停用大多数锁。

答案 1 :(得分:0)

应该是

 sinon.stub(db, 'one').resolves();