diff --git a/tests/test_signatures.py b/tests/test_signatures.py
index 02573a3..f249067 100644
--- a/tests/test_signatures.py
+++ b/tests/test_signatures.py
@@ -291,8 +291,8 @@ def test_is_update_available_when_no_local_image(mocker):
         return_value=RANDOM_DIGEST,
     )
 
-def test_is_update_available_trims():
-    pass
+    # Call is_update_available
+    update_available, digest = is_update_available("ghcr.io/freedomofpress/dangerzone")
 
 
 def test_verify_signature_wrong_payload_digest():