rubocop: turn off SuggestExtensions
rubocop: turn off SuggestExtensions

It wants use to use the rspec extension. Which arguably would be a good
idea, but I don't really want to add more linting, especially for tests
that are largely unmaintained.

git/git-scm.com,git/git-scm.com,git/git-scm.com,git/git-scm.com