Spec for compare i18next libraries. Loads every library in "dev" and "en" languages. After it, checks if the file keys (both files are json at the end) are equals. It uses AsyncSpec libraries for asyncronous specs with Jasmine.

i18nComparerSpec.coffee

files = [
  'a.json',
  'b.json',
  'c.json'
]
last = 'c.json'

loadFileDev = (name, holder, callback) ->
  $.get("locales/dev/#{name}", (data) =>
    holder[name] = data
    callback() if callback?
  , 'json')
loadFileLocale = (name, holder, lang, callback) ->
  $.get("locales/#{lang}/#{name}", (data) =>
    holder[name] = data
    callback() if callback?
  , 'json')

compareObject = (comparer, compared, comparedName) ->
  for key,value of comparer
    if typeof value != 'string'
      compareObject(comparer[key], compared[key], "#{comparedName}/#{key}")
    else if typeof compared[key] == 'undefined'
      expect("Does not exists \"#{key}\" in compared file #{comparedName}").toBe ''
  return
      

compare = (comparer, compared, lang, done) ->
  for fileKey,file of comparer
    compareObject(comparer[fileKey], compared[fileKey], "#{lang}/#{fileKey}")

describe 'File compare', ->
  async = new AsyncSpec @
  async.beforeEach (done)->
    if (!@dev)
      @dev = []
      for file in files
        if file != last
          loadFileDev(file, @dev, null)
        else
          loadFileDev(file, @dev, () -> done() )
    else
      done()
  async.it 'Load en', (done) =>
    en = []
    for file in files
      if file != last
        loadFileLocale(file, en, 'en', null)
      else
        loadFileLocale(file, en, 'en', () ->
          compare(@dev, en, 'en')
          compare(en, @dev, 'dev')
          done()
        )