Sometimes, we want to mock globals in Jest and JavaScript.
In this article, we’ll look at how to mock globals in Jest and JavaScript.
How to mock globals in Jest and JavaScript?
To mock globals in Jest and JavaScript, we can use the spyOn and mockImplementation methods.
For instance, in the beforeAll callback, we write
jest.spyOn(window, "navigator", "get").mockImplementation(() => {
//...
});
to call spyOn to create a mock for the window.navigator.get method.
And then we call mockImplemenetation on the returned mocked object with a callback with the mocked implementation of window.navigator.get.
Then in the afterAll callback, we write
jest.restoreAllMocks();
to clear all the mocks.
Conclusion
To mock globals in Jest and JavaScript, we can use the spyOn and mockImplementation methods.
