testing setInterval with Jasmine using a Mock Clock

set-interval-spec.js

describe('createIntervalCallback', function() {
  var sut = $.clockTest;
  
  it('calls setInterval with callback() at a delay of 7000 ms', function() {
    spyOn(sut, 'callback');
    jasmine.Clock.useMock();
					
    sut.createIntervalCallback();

    jasmine.Clock.tick(7000); 
				
    expect(sut.callback).toHaveBeenCalled();
  });
});

set-interval.js

(function($) {
  $.clockTest = $.clockTest || {};

  $.extend($.clockTest, {
    createIntervalCallback: function() {
      setInterval(function() { $.clockTest.callback(); }, 7000);
    },
    
    callback: function() {
      // do stuff...
    }

  };


}(jQuery));