Unit test error.

gistfile1.txt

  2) Users User timezone Test timezones:
     TypeError: Cannot call method 'toString' of undefined
      at ServerResponse.writeHead (http.js:980:45)
      at ServerResponse.res.writeHead (/private/tmp/Hilary/node_modules/connect/lib/patch.js:75:22)
      at ServerResponse._implicitHeader (http.js:931:8)
      at ServerResponse.OutgoingMessage.end (http.js:766:10)
      at res.end (/private/tmp/Hilary/node_modules/connect/lib/middleware/session.js:284:13)
      at module.exports.RedisStore.set (/private/tmp/Hilary/node_modules/connect-redis/lib/connect-redis.js:128:18)
      at try_callback (/private/tmp/Hilary/node_modules/redis/index.js:520:9)
      at RedisClient.return_reply (/private/tmp/Hilary/node_modules/redis/index.js:590:13)
      at HiredisReplyParser.RedisClient.init_parser (/private/tmp/Hilary/node_modules/redis/index.js:263:14)
      at HiredisReplyParser.EventEmitter.emit (events.js:88:17)
      at HiredisReplyParser.execute (/private/tmp/Hilary/node_modules/redis/lib/parser/hiredis.js:43:18)
      at RedisClient.on_data (/private/tmp/Hilary/node_modules/redis/index.js:476:27)
      at Socket.<anonymous> (/private/tmp/Hilary/node_modules/redis/index.js:79:14)
      at Socket.EventEmitter.emit (events.js:88:17)
      at TCP.onread (net.js:395:14)