What is an example of a boilerplate A-Frame 1.0.4+ component project with working tests?

I'm looking to have basic testing of an A-Frame component to verify the modifications it makes to the scene and DOM.

I have attempted to use the angle repo https://github.com/ngokevin/angle to init a new component which includes pre-configured tests with karma, as recommended by this post: Writing test specs for A-Frame

However the default test in angle does not run, resulting in this error in the console: You need to include some adapter that implements __karma__.start method!

Is there any example of a working A-Frame component test that I can build from?