I have a controller which emits a broadcast event on the rootscope. I would like to test that the broacast event is fired correctly.
My code in my controller looks like this:
$scope.$watch("pageIndex", function(){
if($scope.pageIndex == 4)
{
// emit social share
$rootScope.$broadcast('myEvent');
}
});
I have tried to test it with the following code:
it('Should call myEvent when pageIndex is 4',function(){
scope.pageIndex = 4;
scope.$apply();
expect(rootScope.$on).toHaveBeenCalledWith('myEvent');
});
But it tells me that the code isn't called, which I have manually tested that it does. I have then tried with the following code:
it('Should call myEvent when pageIndex is 4',function(){
var listener = jasmine.createSpy('listener');
rootScope.$on('myEvent', listener);
scope.pageIndex = 4;
scope.$apply();
expect(listener).toHaveBeenCalled();
});
But with the same negative result. Is there a way to test that an event is broadcasted?
Assuming you're using Jasmine, the following is working great for me.
... other unit test setup code ...
var rootScope;
beforeEach(inject(function($injector) {
rootScope = $injector.get('$rootScope');
spyOn(rootScope, '$broadcast');
}));
describe("my tests", function() {
it("should broadcast something", function() {
expect(rootScope.$broadcast).toHaveBeenCalledWith('myEvent');
});
});
If you're broadcasting a message and attaching objects to it, you can even test that the objects match expectations
someObj = { ... something ... };
expect(rootScope.$broadcast).toHaveBeenCalledWith('someEvent', someObj);
Here's how its done with mochaJs, with sinon for mocks and chai for expectations.
describe("broadcast test", function() {
beforeEach(inject(function($rootScope){
sinon.spy($rootScope, "$broadcast")
scope.foo() //this broadcasts the event. $rootScope.$broadcast("testEvent")
}))
it("broadcasts the event", inject(function($rootScope){
expect($rootScope.$broadcast.calledWith("testEvent")).to.be.true
}))
})
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