Accessing real AngularJS service in Jasmine tests when mocked globally - angularjs

Question

Let assume I have some service in AngularJS: ComplexService. It performs complex operations on init and has got a complex interface...
In Karma/Jasmine tests, to simplify other components unit tests, I have defined a mock globally[1] (outside of all describe declarations in Karma global scope):
beforeEach(function () {
angular.mock.module('MYMODULE', function ($provide) {
$provide.value('ComplexService', buildComplexServiceMock());
});
});
[1](The reason of that decision was to avoid declaring it in each test suite again -we have about 50 of them and each eventually uses the service indirectly or by default)
Let now suppose, that I decided to Write some unit test for the complex service.
My question is: Does it exist a way to access the real service now? (not mock)
My temporary solution is to make my service accessible in global scope too and access it directly:
function ComplexService(Other, Dependencies) {
//code here
}
angular.module('MYMODULE')
.service('ComplexService', ['Other', 'Dependencies', ComplexService]);
window.ComplexService = ComplexService;
But I am not happy with it. (I don't want production code to be accessible globally, maybe except in tests)
Can somebody please, give me some clue?
Edit
Another thing I would like to avoid if possible is specifying ComplexService dependencies in test directly (in a case the order would change in future)
Temporary solution which is bad:
let complexServiceTestable;
beforeEach(function () {
inject(function (Other, Dependencies) {
//If order of dependencies would change, I will have to modify following line:
complexServiceTestable = window.ComplexService(Other, Dependencies);
});
});
Something I would appreciate most if possible:
let complexServiceTestable;
beforeEach(function () {
angular.mock.module('MYMODULE', function ($provide) {
//some magic here
});
});
beforeEach(function () {
inject(function (ComplexService) {
complexServiceTestable = ComplexService;
});
});

Answer 1

You could do is to explicity import the real service in your test and override the $provide mock with the real one:
import ComplexService from '../your-complex-service-path/ComplexService';
describe('....', function(){
beforeEach(function () {
angular.mock.module('MYMODULE', function ($provide) {
$provide.value('ComplexService', ComplexService);
});
});
});
I understand the design decision but maybe the best thing would be to make a factory capable of injecting the $provide mocks of any Service passed as a parameter, name or path, It can be a little tricky but It might ended up being a more maintainable and descriptive approach.

Answer 2

Thanks to #MatiasFernandesMartinez hints in comments, after some experiments I finally reached working solution (using provider):
In global Karma context:
beforeEach(function () {
angular.mock.module('MYMODULE', function ($provide, ComplexServiceProvider) {
$provide.value('ComplexServiceBackup', ComplexServiceProvider);
$provide.value('ComplexService', buildComplexServiceMock());
});
});
In ComplexService tests:
describe('ComplexService', function () {
let complexServiceTestable;
beforeEach(function () {
inject(function (ComplexServiceBackup) {
complexServiceTestable = ComplexServiceBackup.$get();
});
});
});