[IMP] tests: use long message in case of error

openerp/tests/common.py

@@ -80,11 +80,13 @@ def post_install(flag):
 class BaseCase(unittest2.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()