Simple Jasmine test failing

Below is an angularJS Factory

angular.module('employer').factory('emp', function($rootScope, $ionicPopup, $state, $window){

var pop = {}; 

pop.integrate = function(){
       return 123;
    };
});

Following are Jasmine tests I have tried,

1)

it('integration', function(){
              expect(pop.integrate).toEqual(123);
              });

This gives me an error - Expected undefined to equal 123.

2)

it('integration', function(){
              spyOn(pop, 'integrate');
              pop.integrate();
              expect(pop.integrate).toHaveBeenCalled();
              expect(pop.integrate).toEqual(123);
              });

This gives me an error - pop.integrate() is not a function.