Add test file for phantom experiments

[sidiousvic]

We are currently testing specific aspects of the phantom engine. DOM, exorcising, interfaces.

It would be bery nise to have a dev—only test file where we can run fast experiments for the library.

Perhaps a .js file that we can run with Node and a DOM facilitator like jsdom?

If running in Node, we have to be mindful to use valid Node module system syntax (AMD) in this file, for example replacing the use of ES2015's import with require(), etc.