Missing Translations RSpec Matcher

missing_translations.rb

# spec/support/missing_translations.rb
require 'rspec/expectations'

RSpec::Matchers.define :have_missing_translations do

  match do |actual|
    missing_i18n_js = /\[missing ".*" translation\]/
    missing_i18n_ruby = /class="translation_missing"/
    !!(actual.body.match(missing_i18n_ruby) || actual.body.match(missing_i18n_js))
  end

  failure_message_for_should do |actual|
    'expected page to have missing translations'
  end

  failure_message_for_should_not do |actual|
    'expected page to not have missing translations'
  end
end