Stubbing window functions in Jest

javascript sinon jestjs
Yangshun Tay picture Yangshun Tay · Jan 19, 2017 · Viewed 18.4k times · Source

In my code, I trigger a callback upon "OK" click of a window.confirm prompt, and I want to test that the callback is triggered.

In sinon, I can stub the window.confirm function via:

const confirmStub = sinon.stub(window, 'confirm');
confirmStub.returns(true);

Is there a way I can achieve this stubbing in Jest?

Answer

Andreas Köberle picture Andreas Köberle · Jan 19, 2017

In jest you can just overwrite them using global.

global.confirm = () => true

As in jest every test file run in its own process you don't have to reset the settings.

Related questions

How to mock/replace getter function of object with Jest?

In Sinon I can do the following: var myObj = { prop: 'foo' }; sinon.stub(myObj, 'prop').get(function getterFn() { return 'bar'; }); myObj.prop; // 'bar' But how can I do the same with Jest? I can't just overwrite the function with something …

Read More
Cleaning up sinon stubs easily

Is there a way to easily reset all sinon spys mocks and stubs that will work cleanly with mocha's beforeEach blocks. I see sandboxing is an option but I do not see how you can use a sandbox for this …

Read More
Stubbing a class method with Sinon.js

I am trying to stub a method using sinon.js but I get the following error: Uncaught TypeError: Attempted to wrap undefined property sample_pressure as function I also went to this question (Stubbing and/or mocking a class in …

Read More