diff --git a/test/test_guid.py b/test/test_guid.py
new file mode 100644
index 00000000..aba8e2a1
--- /dev/null
+++ b/test/test_guid.py
@@ -0,0 +1,13 @@
+from smartcard.guid import GUIDToStr, strToGUID
+
+
+def test_roundtrip_string():
+    string = '{AD4F1667-EA75-4124-84D4-641B3B197C65}'
+    assert GUIDToStr(strToGUID(string)) == string
+
+
+def test_roundtrip_list_of_ints():
+    list_of_ints = [
+        103, 22, 79, 173, 117, 234, 36, 65, 132, 212, 100, 27, 59, 25, 124, 101
+    ]
+    assert strToGUID(GUIDToStr(list_of_ints)) == list_of_ints