Testing a debounced function in AngularJS with Jasmine never calls the function

Question

I have a method in a service that uses underscore\'s debounce.

Inside that method is a call to a method on a different service. I\'m trying to test that the different s

Answer 1

Angular $timeout has advantage in tests because it is mocked in tests to be synchronous. The one won't have this advantage when third-party asynchronous tools one used. In general asynchronous specs will look like that:

var maxDelay = 500;

  ...
  it('has a method getMind, that calls herp.aMethod', function (done){
    whoa.getMind();
    setTimeout(function () {
      expect(herp.aMethod).toHaveBeenCalled();
      done();
    }, maxDelay);
  });

Since Underscore debounce doesn't offer flush functionality (while the recent version of Lodash debounce does), asynchronous testing is the best option available.