diff --git a/.circleci/config.yml b/.circleci/config.yml
index 2f6c76d..f1fbc10 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -11,3 +11,4 @@ jobs:
             - run: env/bin/pip install -e .
             - run: env/bin/pip install -r dev-requirements.txt
             - run: env/bin/python setup.py test
+            - run: env/bin/black tests ipc_unix
diff --git a/tests/test_basic.py b/tests/test_basic.py
index 714ac89..9f71b53 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -1,5 +1,6 @@
 from unittest import TestCase
 
+
 class BasicTestCase(TestCase):
     def test_something_basic(self):
         self.assertTrue(True)