SW-609: Fix Exception.message issue in t_voevent_decider.py

SAS/TriggerServices/test/t_voevent_decider.py

@@ -44,7 +44,7 @@ class TestVOEventDecider(unittest.TestCase):
         self.voevent.attrib['role'] = 'utility'  # pretend it's a real event
         with self.assertRaises(ValueError) as err:
             self.alertdecider.is_acceptable(self.voevent)
-        self.assertTrue('past' in err.exception.message)
+        self.assertTrue('past' in str(err.exception))
 
     def test_ALERTDecider_raises_ValueError_on_futuristic_event(self):
         self.voevent.attrib['role'] = 'utility'  # pretend it's a real event
@@ -52,7 +52,7 @@ class TestVOEventDecider(unittest.TestCase):
         isotime.text = (datetime.datetime.utcnow() + datetime.timedelta(minutes=35)).isoformat()
         with self.assertRaises(ValueError) as err:
             self.alertdecider.is_acceptable(self.voevent)
-        self.assertTrue('future' in err.exception.message)
+        self.assertTrue('future' in str(err.exception))
 
     def test_ALERTDecider_accepts_live_event_in_near_future(self):
         self.voevent.attrib['role'] = 'utility'  # pretend it's a real event