discourse/spec/models/locale_site_setting_spec.rb

require 'rails_helper'

describe LocaleSiteSetting do

  describe 'valid_value?' do
    it 'returns true for a locale that we have translations for' do
      expect(LocaleSiteSetting.valid_value?('en')).to eq(true)
    end

    it 'returns false for a locale that we do not have translations for' do
      expect(LocaleSiteSetting.valid_value?('swedish-chef')).to eq(false)
    end
  end

  describe 'values' do
    it 'returns all the locales that we have translations for' do
      expect(LocaleSiteSetting.values.map { |x| x[:value] }).to include(*Dir.glob(File.join(Rails.root, 'config', 'locales', 'client.*.yml')).map { |x| x.split('.')[-2] })
    end
  end

end