Temporarily swap in I18n translations for a context

rspec_with_translations.rb

module RSpecWithTranslations
  def with_translations *args, &block
    translations = args.extract_options!
    args = args.presence || ["with translations"]

    context *args do
      around do |example|
        begin
          old, I18n.backend = I18n.backend, I18n::Backend::KeyValue.new(translations)
          example.call
        ensure
          I18n.backend = old
        end
      end

      instance_eval &block
    end
  end
end

RSpec::configure do |config|
  config.extend RSpecWithTranslations
end