diff --git a/tests/test-rebase-obsolete.t b/tests/test-rebase-obsolete.t
--- a/tests/test-rebase-obsolete.t
+++ b/tests/test-rebase-obsolete.t
@@ -1534,6 +1534,14 @@
   rebasing 1:112478962961 "B" (B)
   note: not rebasing 3:26805aba1e60 "C" (C) and its descendants as this would cause divergence
 
+  $ hg debugobsolete $(hg log -r E -T '{node}')
+  1 new obsolescence markers
+  obsoleted 1 changesets
+  $ hg tag --local --remove E
+BROKEN: this rebase would not cause divergence
+  $ hg rebase -d D -s C
+  note: not rebasing 3:26805aba1e60 "C" (C) and its descendants as this would cause divergence
+
   $ cd ..
 
   $ hg init p2-succ-in-dest-c