Test code that uses Rx throttle() internally

gistfile1.txt

(function () {
    'use strict';

    angular.module('adbrain.app.reporting').controller('ReportingV2Controller', ReportingV2Controller);

    ReportingV2Controller.$inject= ['$scope', 'logger', 'advertisers', 'reportingV2Service'];

    function ReportingV2Controller($scope, logger, advertisers, reportingV2Service) {
        var vm = this;

        init();

        function init() {
            logger.log(ReportingV2Controller.name, init.name, 'Initializing');

            vm.dateFormat = 'DD/MM/YYYY';
            vm.startDate = moment().subtract(30, 'days').format(vm.dateFormat);
            vm.endDate = moment().format(vm.dateFormat);

            vm.advertisers = _.map(advertisers, function(advertiser){
                return {
                    id: advertiser.id,
                    text: advertiser.name
                };
            });

            //Make sure it is sorted alphabetically
            vm.advertisers = _.sortBy(vm.advertisers, 'text');
            vm.selectedAdvertiser = vm.advertisers[0].id;
            vm.selectedPrimaryContents = [];

            //Specify refresh logic
            var refreshStream = Rx.Observable.fromWatchGroup($scope, [
                    'vm.dimension1',
                    'vm.dimension2',
                    'vm.selectedAdvertiser',
                    'vm.selectedPrimaryContents',
                    'vm.startDate',
                    'vm.endDate'
                ]);

          //THIS ARE THE IMPORTANT BITS!
            var resultStream = refreshStream
                .throttle(350, !!window.jasmine ? Rx.Scheduler.immediate : null) //==> This is the critical bit!
                .map(function(){
                    var queryBuilder = new Adbrain.Model.ReportingQueryBuilder();
                    var query = queryBuilder.buildChartQuery(vm.selectedAdvertiser);
                    return query;
                })
                .distinctUntilChanged()
                .select(reportingV2Service.getReportStream)
                .switchLatest();

            resultStream.forEach(function(reportData){
                vm.result = reportData;
            });
        }
    }
})();

//THIS IS THE TEST
    it('should run query when dimension1 is changed', function(){
        //Arrange
        $http.when('POST', api.route(api.app.reports.report)).respond([]);
        var controller = createController();

        //Act
        controller.dimension1 = 'test';
        $scope.$digest();
        $http.flush();

        //Assert
        expect(controller.result).toBeDefined();
    });

So the questions is how can you specify the scheduler behaviour without injecting it explicitly?
I want to remove this .throttle(350, !!window.jasmine ? Rx.Scheduler.immediate : null) and use just throttle(350).

It should be the testing environment's concern to specify this.