diff --git a/tests/test-smartlog.t b/tests/test-smartlog.t
--- a/tests/test-smartlog.t
+++ b/tests/test-smartlog.t
@@ -502,3 +502,7 @@
       splitsuccessors
                     Return all of the node's successors created as a result of
                     split
+  --
+      successorssets
+                    Returns a string of sets of successors for a changectx
+