diff -r 21ffe6b97a25 -r 1de3364320af tests/test-merge-subrepos.t
--- a/tests/test-merge-subrepos.t	Sun Dec 16 16:31:31 2018 +0900
+++ b/tests/test-merge-subrepos.t	Sat Dec 15 17:52:14 2018 +0900
@@ -57,7 +57,8 @@
 
 A deleted subrepo file is flagged as dirty, like the top level repo
 
-  $ hg id --config extensions.blackbox= --config blackbox.dirty=True
+  $ hg id --config extensions.blackbox= --config blackbox.dirty=True \
+  > --config blackbox.track='command commandfinish'
   9bfe45a197d7+ tip
   $ cat .hg/blackbox.log
   * @9bfe45a197d7b0ab09bf287729dd57e9619c9da5+ (*)> serve --cmdserver chgunix * (glob) (chg !)