i18n_spec_generator.rb

require 'yaml'
# For some weird reason I ended up creating a script to create specs
# for testing the I18n Locale file. It happens that I never used it anyway
# but it might be of use to someone so I'll leave it here.
#
# This assumes you use I18n, and also uses the YAML gem. The example is
# default configured for the Rails path to the locale file, but off course
# you can change it.
#
# Note: This is just a generator in case you already started your project
# without testing your I18n files. So for special cases where you have
# interpolation, go ahead and fix it manually

class I18nSpecGenerator
  def initialize(localization_file_path)
    @keys       = []
    @final_keys = []
    @yaml_file  = YAML.load_file(localization_file_path)
  end

  def generate_specs
    @yaml_file.each do |key, value|
      build_string(key, value)
    end
  end

  def print_specs_to_file(file_name)
    output_file = File.new(file_name, 'w')
    output_file.write("require 'spec_helper'\n")
    output_file.write("\n")
    output_file.write("# This file contains one test per I18n key\n")
    output_file.write("\n")

    generate_specs if @final_keys.empty?
    @final_keys.each do |key_value_pair|
      output_file.write("it { expect(I18n.t('#{key_value_pair[:key]}').to " +
        "eq(\"#{key_value_pair[:value]}\") }\n")
    end

    output_file.close
  end

  def build_string(key, value)
    @keys << key

    if value.is_a?(Hash)
      value.each do |inner_key, inner_value|
        build_string(inner_key, inner_value)
      end

      @keys = []
    else
      @final_keys << { key: @keys.join('.'), value: value }
    end
  end
end

generator = I18nSpecGenerator.new('./config/locales/en.yml')
generator.print_specs_to_file('i18n_spec.rb')