Catch $http use $httpBackend in App.run - testing

Question

I have a module App which will check if the user has sign in.
App.run ['$rootScope', 'UserService', ($rootScope, UserService) ->
UserService.current_user()
]
The UserService.current_user() will trigger a $http request.
So how can i write the $httpBackend to mockup the request? I have tried some method:
describe 'App', ->
$httpBackend = null
beforeEach(module('App')) # one
beforeEach inject ($injector) -> # two
$httpBackend = $injector.get('$httpBackend')
$httpBackend
.when('GET', '/api/1/users/current_user')
.respond(403, {"error":"not signin"})
it "should get current_user request", () ->
$httpBackend.expectGET('/api/1/users/current_user').respond(403, {'error': 'not signin'})
This will show the error:
Error: Unexpected request: GET /api/1/users/current_user No more request expected
If I change the sequence of # one and # two. It will show error
Error: Injector already created, can not register a module!
This makes me fall in depression. I need some help.

Answer 1

I made it working with this :
describe 'App', ->
beforeEach angular.mock.module('App')
it "should get current_user request", inject ($httpBackend) ->
$httpBackend.expectGET('/api/1/users/current_user').respond(403, {'error': 'not signin'})
$httpBackend.flush()
And it works also if you put the backend expectation in a before each :
describe 'App', ->
beforeEach angular.mock.module('App')
beforeEach inject ($httpBackend) ->
$httpBackend.expectGET('/api/1/users/current_user').respond(403, {'error': 'not signin'})
$httpBackend.flush()
it 'should test someting else', ->
See it in action in this Plunker.