diff --git a/tests/grub_script_comments.in b/tests/grub_script_comments.in
index 7b3410717..f212cc1e1 100644
--- a/tests/grub_script_comments.in
+++ b/tests/grub_script_comments.in
@@ -17,3 +17,12 @@
 
 echo a###b
 echo a# #b
+
+echo #
+echo \#
+
+echo '#'
+echo "#"
+
+echo '\#'
+echo "\#"