diff --git a/tests/test_tensorflow_engine.py b/tests/test_tensorflow_engine.py
index c7db273..4176215 100644
--- a/tests/test_tensorflow_engine.py
+++ b/tests/test_tensorflow_engine.py
@@ -19,6 +19,7 @@ def test_engine(self):
             cv2.imread(jpg_filepath),
             cv2.COLOR_BGR2RGB)
         tfe.process_output(tfe.inference(tfe.process_input(rgb_array)))
+        tfe.process_output(tfe.inference(tfe.process_input(rgb_array)))
         #self.assertEqual('foo'.upper(), 'FOO')
 
     #def test_isupper(self):