foo.js

function test(fixture, element) {
        // given
        // var changeCallback = jasmine.createSpy('changeCallback');

        var options = {
          disabled: true,
          // change: changeCallback
        };
        // when
        element.pickList(options);

        
        // then
        var listClassAttr = element.attr('class');
        var sourceClassAttr = element.find('.source').attr('class');
        var targetClassAttr = element.find('.target').attr('class');
        var buttonsClasses = element.find('.btn');

        expect(listClassAttr).toContain('disabled');
        expect(sourceClassAttr).toContain('disabled');
        expect(targetClassAttr).toContain('disabled');
        buttonsClasses.each(function (index) {
          expect(this.attr('disabled')).toEqual(true);
        });

        debugger;
        element.pickList('option', 'disabled', 'false');
      }

@jhuska

this will not work? line 23

expect( $(this).attr('disabled')).toEqual(true);

this >>> $(this)