Verify that the infos are in the exception

checkbox-ng/plainbox/impl/unit/test_unit.py

@@ -203,12 +203,14 @@ def test_get_record_value(self):
         self.assertEqual(unit1.get_record_value("key"), "value")
         self.assertEqual(unit2.get_record_value("key"), "value")
         self.assertEqual(unit3.get_record_value("key"), "value")
-        with self.assertRaises(MissingParam):
+        with self.assertRaises(MissingParam) as mp:
             # TODO: this is structured badly, if a unit has a template-engine
             #       it is a tempalte, but the definition is in Unit, not
             #       TemplateUnit. Once you fix it, remove the following line
             unit4.template_id = "template_id"
             unit4.get_record_value("key")
+        self.assertIn("template_id", str(mp.exception))
+        self.assertIn("missing_param", repr(mp.exception))
         self.assertEqual(unit5.get_record_value("key"), None)
         self.assertEqual(unit5.get_record_value("key", "default"), "default")
         self.assertEqual(unit6.get_record_value("key"), None)