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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?
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Stubs are used to validate the state of a method, whereas mocks are used to evaluate the behavior. Jest provides jest. fn , which has both basic mocking and stubbing functionality. A Jest mock can also stub method outputs, and in this case be both a mock and a stub.
To mock the JavaScript window object using Jest, we can use the jest. spyOn method. let windowSpy; beforeEach(() => { windowSpy = jest. spyOn(window, "window", "get"); }); afterEach(() => { windowSpy.
To spy on an exported function in jest, you need to import all named exports and provide that object to the jest. spyOn function. That would look like this: import * as moduleApi from '@module/api'; // Somewhere in your test case or test suite jest.
To check if a component's method is called, we can use the jest. spyOn method to check if it's called. We check if the onclick method is called if we get the p element and call it.
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.
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