diff --git a/Tests/tester.py b/Tests/tester.py
index 3c5f720d2..854895c19 100644
--- a/Tests/tester.py
+++ b/Tests/tester.py
@@ -1,5 +1,9 @@
 from __future__ import print_function
 
+# require that deprecation warnings are triggered 
+import warnings
+warnings.simplefilter('default')
+
 import sys
 py3 = (sys.version_info >= (3,0))