Implementedo roll_back para propiciar isolamento de testes

renzon · renzon · commit 13aefe494644 · 2018-05-16T17:16:10.000-03:00
diff --git a/libpythonpro/spam/db.py b/libpythonpro/spam/db.py
@@ -11,7 +11,7 @@ def listar(self):
         return self.usuarios
 
     def roll_back(self):
-        pass
+        self.usuarios.clear()
 
     def fechar(self):
         pass
