jquery jasmine analytics

jquery_mock.js

      var analytics = {};

      spyOn(instance, '$').and.callFake(function(selector) {
        var jquery_proxy = $(selector);

        ['show', 'hide', 'scrollTop'].forEach(function(method) {
          jquery_proxy[method] = jasmine.createSpy().and.callFake(function() {
            analytics[selector] = analytics[selector] || {};

            if(typeof analytics[selector][method] === 'undefined') analytics[selector][method] = 0;
            analytics[selector][method]++;
          });
        });

        return jquery_proxy;
      });