javascript - Spying on console.error() with Jasmine

Question

I'm actually new to JavaScript as well as Jasmine. So it might be something really obvious that fixes my problem but I can't see it.

I want to check if (an already existing) JavaScript application calls console.error() while loading. I don't really see a way how to realise this with Jasmine. I've included the JavaScript file as well as the spec file in the SpecRunner.html. But I take it that I somehow need to "instantiate" the application in order to test if it throws any errors on the console, right?

Or should I include the SpecRunner.html code only for this purpose into the HTML code of the app?

question from:https://stackoverflow.com/questions/14519203/spying-on-console-error-with-jasmine

Answer 1

You can spy on console.error like this:

beforeEach(function(){
  spyOn(console, 'error');
})

it('should print error to console', function(){
  yourApp.start();
  expect(console.error).toHaveBeenCalled();
})