Unit testing angular factory method with callbacks

I have a factory which has a method which does a $http call . it takes two obj params and 4 callbacks . How do i unit test the method and it's callbacks using Karma -Jasmine ? all the other answers on stack aren't helping me with callbacks .

app.factory('somefactory', ['$http','$rootScope','dependency',
function($http, $rootScope,dependency){

var factory = {
//two obj params and 4 callback parmas           
  method:function(obj1,obj2,succCallbk,failureCallbk,errCallbk,completeCallbk){
        $http({
          method: obj.method,
          url: url,
          data: requestData
        }).success(function(data, status, headers, config){
             if(someCondition){
            _succCallbk(data, status);
            }
             if(someCondition){
            _completeCallbk(data, status);
            }
          })
          .error(function(err){
           if(someCondition){
             _errCallbk()}
            })
           }
          };
 return factory;
})