Can't find variable: $rootScope

I am new to unit testing and I am getting these errors even though I though my test was correct, I just cannot figure out what these errors mean:

 Can't find variable: $rootScope
 Error: Injector already created, can not register a module!

spec.js

var rootScope;
beforeEach(inject(function ($injector) {
    rootScope = $injector.get('$rootScope');
    spyOn(rootScope, '$broadcast');
}));

describe("testing the broadcast", function () {
    it("should broadcast something", function () {
        $rootScope.$apply();
        expect(rootScope.$broadcast).toHaveBeenCalledWith('update');
        someObj = { data: testData};
        expect(rootScope.$broadcast).toHaveBeenCalledWith('update', someObj);
    });
});

controller

(function () {

    var test= angular.module('test');

    test.controller('myCtrl',
        function($rootScope, $scope, $resource, $location, $route, $routeParams, $log, catalogData) {

            $log.debug("myCtrl");
            $log.debug(myCtrl);

            $rootScope.$broadcast("update", {
                data: testData
            });
        }); // catalogCtrl
})();