diff --git a/tests/test-hook b/tests/test-hook
--- a/tests/test-hook
+++ b/tests/test-hook
@@ -61,6 +61,14 @@ echo 'precommit.forbid = echo precommit.
 hg commit -m 'fail' -d '4 0'
 hg -q tip
 
+# preupdate hook can prevent update
+echo 'preupdate = echo preupdate hook: p1=$HG_PARENT1 p2=$HG_PARENT2' >> .hg/hgrc
+hg update 1
+
+# update hook
+echo 'update = echo update hook: p1=$HG_PARENT1 p2=$HG_PARENT2 err=$HG_ERROR' >> .hg/hgrc
+hg update
+
 # prechangegroup hook can prevent incoming changes
 cd ../b
 hg -q tip