backbone.js - Manage global Backbone events while writing Qunit unit tests -

i writing unit tests backbone app. tests trigger events, causing interference among different tests.

here tests

test('user setting company should update departmentslists url', function() {     var acme = new company({ id:274, name: "acme solutions" });     var companies = new companylist;     var departments = new departmentlist;     new companyselectorview({ el: '#company-input', collection: companies });      events.trigger('userset:company', acme);      equal(_.result(departments, 'url'), 'http://'+document.location.host+'/data/companies/274/departments'); });  asynctest('user setting company should retrieve companys departments', function() {     var acme = new company({ id:274, name: "acme solutions" });     var companies = new companylist;     var departments = new departmentlist;     new companyselectorview({ el: '#company-input', collection: companies });      events.trigger('userset:company', acme);      events.on('fetched:departments', function(response) {         deepequal(response, [{id: "8",name: "accounting"},{id: "1",name: "client services"},{id: "470",name: "systems"},{id: "1187",name: "managers"}]);         start();     })  }); 

and relevant part of collection:

var departmentlist = backbone.collection.extend({      initialize: function() {         var self = this;          events.on("userset:company", function(company) {             self.selectedcompany = company;             self.fetch({                 success: function(collection, response, options) {                     events.trigger("fetched:departments", response);                 }             });         });     },      model: department,      selectedcompany: '',      url: function() {         return 'http://'+document.location.host+'/data/companies/'+this.selectedcompany.id+'/departments';     }  }); 

what's solution here? want split these 2 tests out each other, since they're different things, want event trigger included in test.

ps: i'm new backbone & unit testing, criticism more welcome.

the simple way solve use events.once instead of events.on. way events cleaned after each test.