diff --git a/test/generate_expected.py b/test/generate_expected.py
new file mode 100644
index 0000000..f668da2
--- /dev/null
+++ b/test/generate_expected.py
@@ -0,0 +1,12 @@
+from __future__ import print_function
+import glob
+import os.path
+for path in glob.glob( '*.json' ):
+    text = file(path,'rt').read()
+    target = os.path.splitext(path)[0] + '.expected'
+    if os.path.exists( target ):
+        print('skipping:', target)
+    else:
+        print('creating:', target)
+        file(target,'wt').write(text)
+