Can't find variable: $rootScope - angularjs

Question

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 and I have tried several things
Can't find variable: $rootScope
Error: Injector already created, can not register a module!
spec.js
describe('test broadcast', function () {
var $controller;
beforeEach(function() {
module('test');
inject(function (_$rootScope_, _$controller_) {
$rootScope = _$rootScope_;
spyOn($rootScope, '$broadcast');
// Notice how inject $controller here.
$controller = _$controller_;
});
});
it("should broadcast something", function ($rootScope) {
$controller('myCtrl', {
// Pass in the $rootScope dependency.
$rootScope: $rootScope.$new()
})
// Here we actually run the controller.
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
})();

Answer 1

You have a variable called rootScope defined, not $rootScope - change your definition:
rootScope.$apply();
Though I personally like to define them like so:
var $rootScope;
beforeEach(inject(function(_$rootScope_) {
$rootScope = _$rootScope_;
}));

Answer 2

EDIT 2:
You cannot access $rootScope in your it function because it is not in the current javascript scope (not angular $scope, don't get confused).
You need to define it alongside your controller at the top.
var $controller, $rootScope
And remove $rootScope from your it function so you don't overwrite it.
// Notice there is no $rootScope parameter.
it("should broadcast something", function () {
//Code
}
You will also have to pass in your other dependencies.
After a discussion with the OP, the whole code should look like this:
describe('test broadcast', function () { 
var $controller, $rootScope; 
beforeEach(function() { 
module('test'); 
inject(function (_$rootScope_, _ $controller_) { 
$rootScope = _$rootScope_; 
spyOn($rootScope, '$broadcast'); 
$controller = _$controller_; 
}); 
}); 
it("should broadcast something", function () { 
$controller('myCtrl', { 
$scope: $rootScope.$new(), 
catalogData: {} 
}) 
expect($rootScope.$broadcast).toHaveBeenCalledWith('update', {catalog:{}})}); 
})
EDIT 1:
You are passing in the $scope dependency. $broadcast is called on the $rootScope so you need to pass that in. Like this:
var testScope = $rootScope.$new()
$controller('myCtrl', {
// Pass in the $rootScope dependency.
$rootScope: testScope
}
Original post (in case it's still useful to anyone)
You aren't actually calling your controller anywhere in your test suite.
You need to have something like
var $controller
beforeEach(inject(function (_$rootScope_, _$controller_) {
$rootScope = _$rootScope_;
spyOn($rootScope, '$broadcast');
// Notice how inject $controller here.
$controller = _$controller_;
}));
Then initialise it in your test:
it("should broadcast something", function () {
// Here we actually run the controller.
$controller('myCtrl', {
// Pass in the $rootScope dependency.
$rootScope: $rootScope.$new()
}
expect($rootScope.$broadcast).toHaveBeenCalledWith('catalogUpdate');
someObj = { catalog: catalogData};
expect($rootScope.$broadcast).toHaveBeenCalledWith('catalogUpdate', someObj);
});
This will remove the error about $rootScope.broadcast not being called.
Take a look at the "Testing Controllers" section here: https://docs.angularjs.org/guide/controller
As for not being able to register a module, this normally happens if you have an inject() before a beforeEach(module('abc')).
As the error says, you cannot register another module after inject has been called.