new_contents: from featurex.datasets.text import _load_datasets, fetch_dictionary
  from unittest import TestCase
  from pandas import DataFrame
  import urllib2
  
  
  class TestDatasets(TestCase):
      
      def test_dicts(self):
          """
          Check that all text dictionaries download successfully.
          """
          datasets = _load_datasets()
          for dataset in datasets.keys():
              try:
                  data = fetch_dictionary(dataset, save=False)
              except:
                  print("Dataset failed: {0}".format(dataset))
                  data = None
                  
                  # Determine cause of error.
                  try:
                      urllib2.urlopen(datasets[dataset]["url"])
                  except urllib2.HTTPError, e:
                      print("HTTP Error: {0}".format(e.code))
                  except urllib2.URLError, e:
                      print("URL Error: {0}".format(e.args))
              self.assertIsInstance(data, DataFrame)
  
subject: Add test for text dictionaries.