Testing requires a certain level of experience that most JS developers just don't possess yet. My hope is over time a few good talks on the subject bubble up to expose more people to the how/when/why

Here is one such example that shows how to build a kanban board from the ground up (test-first). It's from EmberConf back in March but a lot of the concepts are truly framework agnostic

http://youtu.be/2b1vcg_XSR8