$rootScope.$on 'rootScope:myBigEvent', (event, myNewValues) ->
$scope.superSecretValues = myNewValues
You can test this in your Jasmine test by using:
describe 'rootScope:myBigEvent', () ->
beforeEach () ->
$injector.get('$rootScope').$broadcast('rootScope:myBigEvent', sampleData)
it 'should set superSecretValues to broadcast value', () ->
expect(scope.superSecretValues).toEqual(sampleData)