diff --git a/cpython-uhashlib/test.py b/cpython-uhashlib/test.py
new file mode 100644
index 000000000..9bc69ad6b
--- /dev/null
+++ b/cpython-uhashlib/test.py
@@ -0,0 +1,9 @@
+import hashlib
+import uhashlib
+
+
+md5 = hashlib.md5(b"foo")
+umd5 = uhashlib.md5(b"foo")
+md5.update(b"bar")
+umd5.update(b"bar")
+assert md5.digest() == umd5.digest()