diff -r 5d8f291405e5 -r 25f1c7bd649d tests/test-blackbox.t
--- a/tests/test-blackbox.t	Tue Oct 23 14:04:17 2018 -0700
+++ b/tests/test-blackbox.t	Wed Oct 17 15:48:01 2018 -0700
@@ -82,6 +82,16 @@
   1970/01/01 00:00:00 bob @0000000000000000000000000000000000000000 (5000)> so-confusing exited 0 after * seconds (glob)
   1970/01/01 00:00:00 bob @0000000000000000000000000000000000000000 (5000)> blackbox
 
+custom date format
+  $ rm ./.hg/blackbox.log
+  $ hg --config blackbox.date-format='%Y-%m-%d @ %H:%M:%S' \
+  >    --config devel.default-date='1334347993 0' --traceback status
+  A a
+  $ hg blackbox
+  2012-04-13 @ 20:13:13 bob @0000000000000000000000000000000000000000 (5000)> --config 'blackbox.date-format=%Y-%m-%d @ %H:%M:%S' --config 'devel.default-date=1334347993 0' --traceback status
+  2012-04-13 @ 20:13:13 bob @0000000000000000000000000000000000000000 (5000)> --config 'blackbox.date-format=%Y-%m-%d @ %H:%M:%S' --config 'devel.default-date=1334347993 0' --traceback status exited 0 after * seconds (glob)
+  1970/01/01 00:00:00 bob @0000000000000000000000000000000000000000 (5000)> blackbox
+
 incoming change tracking
 
 create two heads to verify that we only see one change in the log later