diff --git a/jyafn-python/tests/serde.py b/jyafn-python/tests/serde.py
index f28fce1..b5d3dcd 100644
--- a/jyafn-python/tests/serde.py
+++ b/jyafn-python/tests/serde.py
@@ -1,4 +1,7 @@
 import jyafn as fn
+import os
+
+os.makedirs("data", exist_ok=True)
 
 
 @fn.func