diff -r 43d6ef658874 -r 3725986b151a tests/test-command-template.t
--- a/tests/test-command-template.t	Sat Mar 18 20:11:15 2017 +0900
+++ b/tests/test-command-template.t	Sat Mar 18 20:38:44 2017 +0900
@@ -3521,6 +3521,15 @@
   hg: parse error: pad() expects an integer width
   [255]
 
+Test invalid fillchar passed to pad function
+
+  $ hg log -r 0 -T '{pad(rev, 10, "")}\n'
+  hg: parse error: pad() expects a single fill character
+  [255]
+  $ hg log -r 0 -T '{pad(rev, 10, "--")}\n'
+  hg: parse error: pad() expects a single fill character
+  [255]
+
 Test boolean argument passed to pad function
 
  no crash