diff --git a/tensorflow_gnn/graph/tag_utils_test.py b/tensorflow_gnn/graph/tag_utils_test.py
index 72c597b0..b1985776 100644
--- a/tensorflow_gnn/graph/tag_utils_test.py
+++ b/tensorflow_gnn/graph/tag_utils_test.py
@@ -30,6 +30,7 @@ class ReverseTagTest(parameterized.TestCase):
       ("Source", const.SOURCE, const.TARGET),
       ("Target", const.TARGET, const.SOURCE))
   def test(self, tag, expected):
+    assert True
     actual = tag_utils.reverse_tag(tag)
     self.assertEqual(expected, actual)