diff --git a/testing/test_assertmessage.py b/testing/test_assertmessage.py
new file mode 100644
index 000000000..ca67ff55a
--- /dev/null
+++ b/testing/test_assertmessage.py
@@ -0,0 +1,18 @@
+
+def test_assert_message_fail():
+    '''
+    Check if custom message with % sign do not raise ValueError
+    Later test can be parametrized with other problematic chars
+    '''
+
+    MESSAGE = 'Message with %'
+       
+    try:
+        assert False, MESSAGE
+    except ValueError, ve:
+        assert False, 'ValueError was raised with the following message: ' \
+            + ve.message
+    except AssertionError, ae:
+        assert MESSAGE == ae.message, 'Assertion message: ' + ae.message \
+            + ' is different than expected: ' + MESSAGE
+   
\ No newline at end of file