Yelp/Testify — pull request #108 by sumeet (2012-08-06 01:12:57+00:00)
Title: Add let_before().

Like RSpec's [`let!()`](https://www.relishapp.com/rspec/rspec-core/docs/helper-methods/let-and-let#use-let!-to-define-a-memoized-helper-method-that-is-called-in-a-before-hook) to go with `let()`.