AngularJS Jasmine error 'Controller is not a function' when instantiated with arguments

Question

I have been doing angularJS for a while now (without tests) but I want to do it properly! I have a controller defined like so

(function () {
'use strict';

angular.module('app')
    .controller('CarehomeListCtrl', ['$scope', 'carehomesDataService', carehomeListCtrl]);


function carehomeListCtrl($scope, carehomesDataService) {
    var vm = this;
    vm.carehomeCollection = [];

    vm.activate = activate;


    function activate() {
        vm.carehomeCollection = carehomesDataService.getAllCarehomes();
    }

    activate();
}
})();

and then my spec

   describe("Carehomes tests", function () {
    var $scopeConstructor, $controllerConstructor;

    beforeEach(module('app'));

    beforeEach(inject(function ($controller, $rootScope) {

        $controllerConstructor = $controller;
        $scopeConstructor = $rootScope;
    }));

    describe("CarehomeListCtrl", function () {
        var ctrl, dataService, scope;
        function createController() {
            return $controllerConstructor('CarehomeListCtrl', {
                $scope: scope,
                carehomesDataService: dataService
            });

        }
        beforeEach(inject(function ($injector) {
            scope = $scopeConstructor.$new();
            dataService =$injector.get('carehomesDataService') ;
        }));

        it("should have a carehomesCollection array", function () {
            ctrl = createController();
            expect(ctrl.carehomesCollection).not.toBeNull();
        });

        it("should have 3 items in carehomesCollection array when load is called", function () {
            ctrl = createController();
            expect(ctrl.carehomeCollection.length).toBe(3);
        });
    });


});

The problem here is that the call to instantiate my controller fails with error whenever I call it with any arguments whether an empty object {} or just $scope : scope} so I know the problem is not carehomesDataService.

Result StackTrace: Error: [ng:areq] Argument 'CarehomeListCtrl' is not a function, got undefined http://errors.angularjs.org/1.2.26/ng/areq?p0=CarehomeListCtrl&p1=not%20a%20function%2C%20got%20undefined

However, if I instantiate that controller like this $controllerConstructor('CarehomeListCtrl'); without arguments, it gets instantiated. I'm stumped!

carehomesDataService is a custom service I have written but it's own tests pass and it is correctly injected into the controller in the application.

Any help would be massively appreciated.

Note: I do not quite agree with defining properties on the controller as the view model instead of on $scope but I am following Jesse Liberty's pluralsight course and that's how he does it....plus injecting scope isn't quite working right now which is annoying. Thanks in advance.