diff --git a/testing/test_assertion.py b/testing/test_assertion.py
index 5dbae96a0..f28a51f96 100644
--- a/testing/test_assertion.py
+++ b/testing/test_assertion.py
@@ -1385,7 +1385,6 @@ def test_exception_handling_no_traceback(testdir):
 
 @pytest.mark.skipif("'__pypy__' in sys.builtin_module_names")
 def test_warn_missing(testdir):
-
     testdir.makepyfile("")
 
     warning_output = [