javascript - 如何使用 sinon 正确 stub 和测试函数

Question

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 promise - 我正在使用 chaiAspromised。

我能够使用以下内容成功测试第一个条件(未预设 cookie)

  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')
  })

但是，我无法/不太确定如何测试第二部分，因为它同时依赖于 jwt 和外部数据库调用(它本身是另一个 promise 对象)

到目前为止我已经试过了。 stub db 调用返回这个错误，我发现它非常模糊

 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)

我猜它不允许我 stub 整个数据库对象。我还能怎么处理这个？我只希望 jwt 和 db 调用都不会抛出任何错误。我只是在测试如果 cookie 是 valie 是否发送回正确的对象

  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
  })

Answer 1

您需要覆盖一些 pg-promises 默认值以覆盖特定方法

特别设置 noLocking=true

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

UPDATE-1

来自 pg-promise作者。这是正确的做法。参见选项 noLocking :

If this provision gets in the way of using a mock-up framework for your tests, you can force the library to deactivate most of the locks by setting noLocking = true within the options.

UPDATE-2

接口(interface)锁定已在 pg-promise v11 中完全移除。选项 noLocking 不再存在。