old_contents: from __future__ import unicode_literals
  
  from unittest import TestCase
  from wtforms import TextField, validators
  from wtforms.ext.i18n.utils import get_translations
  from wtforms.ext.i18n import form as i18n_form
  
  
  class I18NTest(TestCase):
      def test_failure(self):
          self.assertRaises(IOError, get_translations, [])
  
      def test_us_translation(self):
          translations = get_translations(['en_US'])
          self.assertEqual(translations.gettext('Invalid Mac address.'), 'Invalid MAC address.')
  
  
  class FormTest(TestCase):
      class F(i18n_form.Form):
          LANGUAGES = ['en_US', 'en']
          a = TextField(validators=[validators.Required()])
  
      def test_form(self):
          tcache = i18n_form.translations_cache
          tcache.clear()
          form = self.F()
  
          assert ('en_US', 'en') in tcache
          self.assertIs(form._get_translations(), tcache[('en_US', 'en')])
          assert not form.validate()
          self.assertEqual(form.a.errors[0], 'This field is required.')
  
          form = self.F(LANGUAGES=['es'])
          print form.LANGUAGES
          assert len(tcache) == 2
          assert ('es', ) in tcache
          assert not form.validate()
          self.assertEqual(form.a.errors[0], 'Este campo es obligatorio.')
  
  
  if __name__ == '__main__':
      from unittest import main
      main()
  
  
new_contents: from __future__ import unicode_literals
  
  from unittest import TestCase
  from wtforms import TextField, validators
  from wtforms.ext.i18n.utils import get_translations
  from wtforms.ext.i18n import form as i18n_form
  
  
  class I18NTest(TestCase):
      def test_failure(self):
          self.assertRaises(IOError, get_translations, [])
  
      def test_us_translation(self):
          translations = get_translations(['en_US'])
          self.assertEqual(translations.gettext('Invalid Mac address.'), 'Invalid MAC address.')
  
  
  class FormTest(TestCase):
      class F(i18n_form.Form):
          LANGUAGES = ['en_US', 'en']
          a = TextField(validators=[validators.Required()])
  
      def test_form(self):
          tcache = i18n_form.translations_cache
          tcache.clear()
          form = self.F()
  
          assert ('en_US', 'en') in tcache
          self.assertIs(form._get_translations(), tcache[('en_US', 'en')])
          assert not form.validate()
          self.assertEqual(form.a.errors[0], 'This field is required.')
  
          form = self.F(LANGUAGES=['es'])
          assert len(tcache) == 2
          assert ('es', ) in tcache
          assert not form.validate()
          self.assertEqual(form.a.errors[0], 'Este campo es obligatorio.')
  
  
  if __name__ == '__main__':
      from unittest import main
      main()
  
  
subject: Remove spurious print.