Setup Busted test framework and start porting tests #358
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Here is a start at work for #356.
Porting all the tests will take some time. It isn't always very clear what is being tested or why, so setting up the right test in a new syntax sometimes takes a dig through commit and issue history. Hopefully the test descriptions in Busted will do a better job of documenting the 'why' of tests for future developers.
I suggest we port a small handful of tests to make sure the framework is working as we want, then merge this. That will leave some tests in the old system and some in the new which is awkward, but it will mean all new tests can be written in Busted. I'm already working on new tests for the class system (see #353) and I don't really want to write them in the old framework. It doesn't seem to be too awkward to have them side by side. Eventually when the old tests directory is cleared out in favor of new tests we can drop the test run command and that will be it.