Jest: how to mock console when it is used by a third-party-library?

Question

I am trying to mock console.warn/error but i can\'t. I use a third-party-library which calls console.warn inside it. I need to test was it called or wasn\'t. In my test case

Answer 1

You have to use global to access objects in the global context

global.console = {warn: jest.fn()}
expect(console.warn).toBeCalled()

or use jest.spyOn added in 19.0.0

jest.spyOn(global.console, 'warn')