diff --git a/openerp/tests/common.py b/openerp/tests/common.py
index 07f95eac800..3cb271e075d 100644
--- a/openerp/tests/common.py
+++ b/openerp/tests/common.py
@@ -82,11 +82,13 @@ def post_install(flag):
 class BaseCase(unittest.TestCase):
     """
     Subclass of TestCase for common OpenERP-specific code.
-    
+
     This class is abstract and expects self.registry, self.cr and self.uid to be
     initialized by subclasses.
     """
 
+    longMessage = True      # more verbose error message by default: https://www.odoo.com/r/Vmh
+
     def cursor(self):
         return self.registry.cursor()