tests/test-githelp.t

--- a/tests/test-githelp.t	Sat Nov 30 03:15:17 2019 -0500
+++ b/tests/test-githelp.t	Mon Dec 02 10:18:18 2019 +0100
@@ -264,6 +264,10 @@
   $ hg githelp -- git commit --reuse-message deadbeef
   hg commit -M deadbeef
 
+githelp for reuse message using HEAD
+  $ hg githelp -- git commit --reuse-message HEAD~
+  hg commit -M .~1
+
 githelp for apply with no options
   $ hg githelp -- apply
   hg import --no-commit