new_contents: from datetime import datetime
  from flexget.utils import json
  
  
  class TestJson(object):
  
      def test_dt_encode(self):
          date_str = '2016-03-11T17:12:17Z'
          dt = datetime.strptime(date_str, '%Y-%m-%dT%H:%M:%SZ')
          encoded_dt = json.dumps(dt, encode_datetime=True)
          assert encoded_dt == '"%s"' % date_str
  
      def test_dt_decode(self):
          date_str = '"2016-03-11T17:12:17Z"'
          dt = datetime.strptime(date_str, '"%Y-%m-%dT%H:%M:%SZ"')
          decoded_dt = json.loads(date_str, decode_datetime=True)
          assert dt == decoded_dt
  
subject: Add test for flexget utils (json)