diff --git a/illustrations/1_tester/test_unitaire.py b/illustrations/1_tester/test_unitaire.py
index 4cba9b5..1c57571 100644
--- a/illustrations/1_tester/test_unitaire.py
+++ b/illustrations/1_tester/test_unitaire.py
@@ -19,8 +19,8 @@ def est_premier(n):
 def reverse_words(S):
     """
     >>> reverse_words("abc def")
-    cba fed
+    'cba fed'
     >>> reverse_words("bonjour bonsoir")
-    roujnob riosnob
+    'roujnob riosnob'
     """
     pass