javascript mock import in component with jest

any idea how to mock an “import” for testing? I use jest now.

ie:

//browser.js
export const browser = {
    id: undefined
};
export const getBrowser = function() {
    return browser;
};


//fetch-data.js
//code that uses the browser and I wanna test
import {getBrowser} from './../components/browser';

export const fetchData = function() {
     const browser = getBrowser();
     return Object.assign({dontcare:1}, browser);
};



//My test... Im using jest
import {fetchData} from './../fetch-data.js';
    expect(fetchData()).toBe({......});
};

now in the test file I want to mock the response of the browser component…

Any ideas?

Thanks!