old_contents: import unittest
  import aiohttp
  
  import wordcount
  
  from . import const
  
  class FetcherTest(unittest.TestCase):
      @classmethod
      def setUpClass(cls):
          session = aiohttp.ClientSession(loop = loop)
          cls.fetcher = wordcount.Fetcher(session, const.url)
  
      @unittest.skipIf(const.devel, "Development Environment")
      def test_fetch(self):
          self.fetcher.fetch()
          self.assertIsNotNone(self.fetcher.response)
          self.assertIsNotNone(self.fetcher.data)
  
new_contents: import unittest
  import aiohttp
  
  import wordcount
  
  from . import const
  
  class FetcherTest(unittest.TestCase):
      @classmethod
      def setUpClass(cls):
          session = aiohttp.ClientSession()
          cls.fetcher = wordcount.Fetcher(session, const.url)
  
      @unittest.skipIf(const.devel, "Development Environment")
      def test_fetch(self):
          self.fetcher.fetch()
          self.assertIsNotNone(self.fetcher.response)
          self.assertIsNotNone(self.fetcher.data)
  
subject: fix missing loop