diff --git a/tests/test_core.py b/tests/test_core.py
index 3280a8dfba2e34218639e552a2ea3655643ffaa5..b1df65d66a4a7347a1aa55ab871e08667586244f 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -7,4 +7,4 @@ from km3net_testdata import data_path
 
 class TestDataPath(unittest.TestCase):
     def test_access(self):
-        assert True
+        assert data_path("km3net_offline.root").endswith("km3net_offline.root")