diff --git a/src/test/regress/expected/nonsense.out b/src/test/regress/expected/nonsense.out
new file mode 100644
index 0000000000..5537473a0b
--- /dev/null
+++ b/src/test/regress/expected/nonsense.out
@@ -0,0 +1,4 @@
+SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE NOT DEFERRABLE , DEFERRABLE , DEFERRABLE READ WRITE , READ ONLY , ISOLATION LEVEL SERIALIZABLE;
+SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE READ WRITE , NOT DEFERRABLE , DEFERRABLE READ WRITE , DEFERRABLE;
+NOTIFY pig ;
+LISTEN mouse;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index d33a4e143d..0a47f299bf 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -121,3 +121,5 @@ test: fast_default
 
 # run stats by itself because its delay may be insufficient under heavy load
 test: stats
+
+test: nonsense
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index f86f5c5682..3cfebd7842 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -196,3 +196,4 @@ test: tuplesort
 test: event_trigger
 test: fast_default
 test: stats
+test: nonsense
diff --git a/src/test/regress/sql/nonsense.sql b/src/test/regress/sql/nonsense.sql
new file mode 100644
index 0000000000..5537473a0b
--- /dev/null
+++ b/src/test/regress/sql/nonsense.sql
@@ -0,0 +1,4 @@
+SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE NOT DEFERRABLE , DEFERRABLE , DEFERRABLE READ WRITE , READ ONLY , ISOLATION LEVEL SERIALIZABLE;
+SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE READ WRITE , NOT DEFERRABLE , DEFERRABLE READ WRITE , DEFERRABLE;
+NOTIFY pig ;
+LISTEN mouse;