stub in javascript

1function getCharacters(callback) {
2  $.get('http://api.example.com/characters', callback);
3}
4

1describe('getCharacters()', function () {
2  it('should get the characters from an external API', function () {
3    const spy = sinon.spy();
4    const fakedGet = sinon.stub($, 'get');
5    fakedGet.yields();
6
7    getCharacters(spy);
8    expect(spy.calledOnce).toBeTruthy();
9  });
10});
11