Although this is more verbose now, it looks more like proper unit tests. The
tester API needs to be revamped because `tester.eval` is *not* unit testing.
I realise that some code might be less readable now, but now that we set a good
default limit, we protect the codebase from further mess. It's important to do
this to prevent adding more mess to already messy code that we have. :doctor:
Just discovered this nice feature of RSpec where it can load all files for
us. Works with `bundle exec rake` and `bundle exec rspec spec/file_spec.rb`,
which covers all use cases.
