Add timeout to a call in test angularjs

gistfile1.js

var backend_mock_timeout = function (par) {
    angular.module('httpBackendMock', ['ngMockE2E'])
        .run(function ($httpBackend) {
            $httpBackend.whenGET(/.*/).passThrough();
            $httpBackend.whenPOST(/check-barcode/).respond(function(){
                return [0,{}];
            });
            $httpBackend.whenPOST(/.*/).passThrough();
        });
        .config(["$provide",function($provide) {
            $provide.decorator('$httpBackend', ["$delegate", "$timeout", function($delegate, $timeout) {
                var proxy = function(method, url, data, callback, headers) {
                    var timeout = url.match(/check-barcode/) ? 10000 : 0;
                    var interceptor = function() {
                        var _this = this,
                            _arguments = arguments;
                        $timeout(function() {
                            callback.apply(_this, _arguments);
                        }, timeout);
                    };
                    return $delegate.call(this, method, url, data, interceptor, headers);
                };
                for(var key in $delegate) {
                    proxy[key] = $delegate[key];
                }
                return proxy;
            }]);
        }]);
};