Getting “Unexpected request” error when running Karma unit test in an AngularJS app

I have seen some questions regarding this but all of them was specific to each case and I couldn't find a solution for my case in those posts.

I have a current controller:

    function Login(authService, $scope) {

    var vm = this;

    vm.submit = submit;

    vm.form = {};

    function submit() {
      if ($scope.loginForm.$invalid) {
        vm.invalid = true;
        return;
      } else {
        var data = {
          usr: vm.form.email,
          pwd: vm.form.password,
          vendorId: 99
        };
        authService.login(data).then(success, error);
      }
    }

    function success(res) {
      if (res.data) {
        //Do stuff
      }
    }

    function error(error) {
      console.log("Error ", error);
    }

  }

And the following unit test:

describe('Login', function() {
    beforeEach(module('app'));

    var loginCtrl, scope, $httpBackend, authService;
    var loginResponse = [{
        "data": {
            "avatar": "avatar",
            "gender": "M",
            "hid": "hid,
            "id": "id",
            "role": "Adult",
            "token": "token"
        }
    }];
    var loginRequest = { "usr": "test@teste.com", "pwd": "123teste!", "vendorId": 99 };

    beforeEach(inject(function($rootScope, _$httpBackend_, $controller, _authService_) {
        $httpBackend = _$httpBackend_;
        scope = $rootScope.$new();
        loginCtrl = $controller('Login', {
            $scope: scope
        });
        authService = _authService_;

    }));

    afterEach(function() {
        $httpBackend.verifyNoOutstandingExpectation();
        $httpBackend.verifyNoOutstandingRequest();
    });

    describe("submit", function() {
        it("should send login data to the server", function() {
            // expect(loginCtrl.login).toBe(false);

            //Tells the $httpBackend service to expect a POST call to be made to a service and that it will return
            //loginResponse object that was defined before
            $httpBackend.expectPOST('api/current/api/login').respond(loginResponse);

            //Execution of the service
            var deferred = authService.login(loginRequest);
            var users;
            deferred.then(function(response){
                users = response.data;
            });
            // expect(loginCtrl.login).toBe(true);

            //Preserve the asynchronous nature of the call while at the same time be able to test the response of the call
            $httpBackend.flush();

            // dump(users);
            expect(users).toEqual(loginResponse);
            // expect(loginCtrl.login).toBe(true);
        });

    });



});

And I am getting the error:

Error: Unexpected request: GET signup/signup.html
No more request expected

I have found why this error occurs (I think). I'm using ui-router and it seems that it is always trying to do a GET request for the router root:

$urlRouterProvider.otherwise('/signup/');

$stateProvider
/* NOT AUTHENTICATED STATES */
  .state('signup', {
    url: '/signup/',
    templateUrl: 'signup/signup.html',
    controller: 'Signup as signupCtrl',
    data: {
      authorizedRoles: [AUTH_EVENTS.notAuthenticated]
    }
  })

Now I have no idea why, or how to fix it... Can someone understand what I'm doing wrong?

Thanks in advance!