Devise patch for test env to cut out expensive password calculations

devise_monkey_patch.rb

  # Don't need passwords in test DB to be secure, but we would like 'em to be
  # fast -- and the stretches mechanism is intended to make passwords
  # computationally expensive.
  module Devise
    module Models
      module DatabaseAuthenticatable
        protected

        def password_digest(password)
          password
        end
      end
    end
  end
  Devise.setup do |config|
    config.stretches = 0
  end