angularjs - jasmine: Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL -

i have angular service called requestnotificationchannel:

app.factory("requestnotificationchannel", function($rootscope) {      var _delete_message_ = "_delete_message_";      function deletemessage(id, index) {         $rootscope.$broadcast(_delete_message_, { id: id, index: index });     };      return {        deletemessage: deletemessage     };  }); 

i trying unit test service using jasmine:

"use strict";  describe("request notification channel", function() {     var requestnotificationchannel, rootscope, scope;      beforeeach(function(_requestnotificationchannel_) {         module("messageappmodule");          inject(function($injector, _requestnotificationchannel_) {             rootscope = $injector.get("$rootscope");             scope = rootscope.$new();             requestnotificationchannel = _requestnotificationchannel_;         })          spyon(rootscope, '$broadcast');     });       it("should broadcast delete message notification", function(done) {          requestnotificationchannel.deletemessage(1, 4);         expect(rootscope.$broadcast).tohavebeencalledwith("_delete_message_", { id: 1, index: 4 });         done();            }); }); 

i read asynchronous support in jasmine, rather new unit testing javascript couldn't make work.

i receiving error :

async callback not invoked within timeout specified jasmine.default_timeout_interval 

and test taking long execute (about 5s).

can me providing working example of code explanation?

having argument in it function cause attempt async call.

//this block signature trigger async behavior. it("should work", function(done){   //... });  //this block signature run synchronously it("should work", function(){   //... }); 

it doesn't make difference done argument named, existence matters. ran issue copy/pasta.

the jasmin asynchronous support docs note argument (named done above) callback can called let jasmine know when asynchronous function complete. if never call it, jasmine never know test done , timeout.