[CORD-1528] Allow to reference models already created

Change-Id: Icf1cab69e0939d84f7f9c01d774f4399df51a7a4
diff --git a/test/test_grpc_models_accessor.py b/test/test_grpc_models_accessor.py
index 707b5ef..03e9285 100644
--- a/test/test_grpc_models_accessor.py
+++ b/test/test_grpc_models_accessor.py
@@ -31,7 +31,7 @@
         }
         with self.assertRaises(Exception) as e:
             GRPCModelsAccessor.get_model_from_classname('i-do-not-exists', data)
-        self.assertEqual(e.exception.message, "[XOS-TOSCA] The model your tring to create (name: test, class: i-do-not-exists) is not know by xos-core")
+        self.assertEqual(e.exception.message, "[XOS-TOSCA] The model you are trying to create (name: test, class: i-do-not-exists) is not know by xos-core")
 
     @patch.object(FakeResource.objects, "filter")
     @patch.object(FakeResource.objects, "new", MagicMock(return_value=FakeModel))