Use explicit keyword args in the tests
diff --git a/tests/test_x509.py b/tests/test_x509.py
index 7edef7e..91b4f2b 100644
--- a/tests/test_x509.py
+++ b/tests/test_x509.py
@@ -801,7 +801,7 @@
         ])).public_key(
             subject_private_key.public_key()
         ).add_extension(
-            x509.BasicConstraints(False, None), True,
+            x509.BasicConstraints(ca=False, path_length=None), True,
         ).not_valid_before(
             not_valid_before
         ).not_valid_after(