diff --git a/src/tests/test_shamira.py b/src/tests/test_shamira.py
--- a/src/tests/test_shamira.py
+++ b/src/tests/test_shamira.py
@@ -1,6 +1,6 @@
-import os
+# GNU GPLv3, see LICENSE
+
 import random
-import unittest
 from unittest import TestCase
 
 from shamira import _shareByte