diff --git a/tests/test_worker.py b/tests/test_worker.py
index d2668da..a8975fd 100644
--- a/tests/test_worker.py
+++ b/tests/test_worker.py
@@ -1,13 +1,10 @@
 from __future__ import unicode_literals
 
-import threading
-
 from channels import DEFAULT_CHANNEL_LAYER, Channel, route
 from channels.asgi import channel_layers
 from channels.exceptions import ConsumeLater
-from channels.signals import worker_ready
 from channels.test import ChannelTestCase
-from channels.worker import Worker, WorkerGroup
+from channels.worker import Worker
 
 try:
     from unittest import mock