diff --git a/tests/transformer/test_import.py b/tests/transformer/test_import.py
index 192dbe4..3b7afcb 100644
--- a/tests/transformer/test_import.py
+++ b/tests/transformer/test_import.py
@@ -50,13 +50,13 @@ def test_RestrictingNodeTransformer__visit_Import__6(c_exec):
     they will be deprecated in a future version."""
     message = 'Line 1: module name starts "_", which is deprecated and will be forbidden in RestrictedPython 5.'  # NOQA: E501
     result = c_exec('from _a import m')
-    assert result.warnings == ([message,])
+    assert result.warnings == ([message, ])
     result = c_exec('from a._b import m')
-    assert result.warnings == ([message,])
+    assert result.warnings == ([message, ])
     result = c_exec('from _a.b import m')
-    assert result.warnings == ([message,])
+    assert result.warnings == ([message, ])
     result = c_exec('from _a._b import m as x')
-    assert result.warnings == ([message,])
+    assert result.warnings == ([message, ])
     # Placeholder for future version
     # """Deny imports from modules starting with `_`."""
     # message = 'Line 1: module name starts "_", which is forbidden.'