diff --git a/src/test/regress/expected/misc_functions.out b/src/test/regress/expected/misc_functions.out
index 8567fcc2b45..01d1ad0b9a4 100644
--- a/src/test/regress/expected/misc_functions.out
+++ b/src/test/regress/expected/misc_functions.out
@@ -378,6 +378,29 @@ select * from (select pg_ls_dir('.') a) a where a = 'base' limit 1;
  base
 (1 row)
 
+-- Test missing_ok (second argument)
+select pg_ls_dir('does not exist', false, false); -- error
+ERROR:  could not open directory "does not exist": No such file or directory
+select pg_ls_dir('does not exist', true, false); -- ok
+ pg_ls_dir 
+-----------
+(0 rows)
+
+-- Test include_dot_dirs (third argument)
+select count(*) = 1 as dot_found
+  from pg_ls_dir('.', false, true) as ls where ls = '.';
+ dot_found 
+-----------
+ t
+(1 row)
+
+select count(*) = 1 as dot_found
+  from pg_ls_dir('.', false, false) as ls where ls = '.';
+ dot_found 
+-----------
+ f
+(1 row)
+
 select * from (select (pg_timezone_names()).name) ptn where name='UTC' limit 1;
  name 
 ------
diff --git a/src/test/regress/sql/misc_functions.sql b/src/test/regress/sql/misc_functions.sql
index 3db3f8bade2..072fc36a1ff 100644
--- a/src/test/regress/sql/misc_functions.sql
+++ b/src/test/regress/sql/misc_functions.sql
@@ -124,6 +124,14 @@ from (select pg_ls_waldir() w) ss where length((w).name) = 24 limit 1;
 select count(*) >= 0 as ok from pg_ls_archive_statusdir();
 
 select * from (select pg_ls_dir('.') a) a where a = 'base' limit 1;
+-- Test missing_ok (second argument)
+select pg_ls_dir('does not exist', false, false); -- error
+select pg_ls_dir('does not exist', true, false); -- ok
+-- Test include_dot_dirs (third argument)
+select count(*) = 1 as dot_found
+  from pg_ls_dir('.', false, true) as ls where ls = '.';
+select count(*) = 1 as dot_found
+  from pg_ls_dir('.', false, false) as ls where ls = '.';
 
 select * from (select (pg_timezone_names()).name) ptn where name='UTC' limit 1;