We specifically looked at CanJS, Backbone and EmberJS. None of which have testability as a core feature. CanJS and Backbone barely mention how to do it, EmberJS has one tiny page on integration testing. Which practically means there isn't a established right way to do testing. And you as a developer need to figure it all out.

Ember are improving this however, with the ember-testing package: https://github.com/emberjs/ember.js/tree/master/packages/emb... Backbone has countless tutorials on how to test, but it's not built into the framework.