Jest for Sinon Stubs

#testing #javascript #jest #sinon

At work, we recently converted from Mocha, Karma, Chai, and Sinon to Jest. It was not immediately obvious what the direct replacement was for

sinon.stub(object, 'methodName').callsFake(() => {})

Found out Jest provides similar functionality with

jest.spyOn(object, 'methodName').mockImplementation(() => {})

Top comments (7)

How to handle it if there is callback ?

What callback are you talking about? Got an example?

sinon.stub(object, 'methodName').callsFake((param,cb) => {
cb(param);
})

jest.spyOn(object, 'methodName').mockImplementation((param, cb) => {
  cb(param)
})

Does that work?

No. It says this expression is not callable. cb: unknow param

ThankYou very much... I have been looking for this exact thing for hours on internet
.... you saved my day

Thank you very much, I spent a lot of time trying to figure out how to solve this kind of problem.
Here's the solution.