Now we only include the cachable registry when running tests.
We basically just load it first and add a bunch of methods to
it before loading the rest of the formula files when we require
global.rb. I added a check to make sure this require order is
preserved.
I also made a bunch of methods private, stop excluding classes
that inherit from casks since it's unnecessary and add more docs.
This adds a registry for all modules and classes that
cachable is included in. The registry allows us to
programmatically clear all caches in between tests
so that we don't forget to do that when adding a new
class or refactoring code. The goal here is to reduce
the number of flaky tests in the future.
