Add more regression tests for ASYNC

diff --git a/src/test/regress/expected/async.out b/src/test/regress/expected/async.out
new file mode 100644
index 0000000..ae0d5df
--- /dev/null
+++ b/src/test/regress/expected/async.out
@@ -0,0 +1,34 @@
+--
+-- ASYNC
+--
+--Should work. Send a valid message via a valid channel name
+SELECT pg_notify('notify_async1','sample message1');
+ pg_notify 
+-----------
+ 
+(1 row)
+
+SELECT pg_notify('notify_async1','');
+ pg_notify 
+-----------
+ 
+(1 row)
+
+SELECT pg_notify('notify_async1',NULL);
+ pg_notify 
+-----------
+ 
+(1 row)
+
+-- Should fail. Send a valid message via an invalid channel name
+SELECT pg_notify('','sample message1');
+ERROR:  channel name cannot be empty
+SELECT pg_notify(NULL,'sample message1');
+ERROR:  channel name cannot be empty
+SELECT pg_notify('notify_async_channel_name_too_long______________________________','sample_message1');
+ERROR:  channel name too long
+--Should work. Valid NOTIFY/LISTEN/UNLISTEN commands
+NOTIFY notify_async2;
+LISTEN notify_async2;
+UNLISTEN notify_async2;
+UNLISTEN *;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index 2af28b1..04cdbb7 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -88,7 +88,7 @@ test: privileges security_label collate matview
 # ----------
 # Another group of parallel tests
 # ----------
-test: alter_generic misc psql
+test: alter_generic misc psql async
 
 # rules cannot run concurrently with any test that creates a view
 test: rules
diff --git a/src/test/regress/sql/async.sql b/src/test/regress/sql/async.sql
new file mode 100644
index 0000000..af3a904
--- /dev/null
+++ b/src/test/regress/sql/async.sql
@@ -0,0 +1,19 @@
+--
+-- ASYNC
+--
+
+--Should work. Send a valid message via a valid channel name
+SELECT pg_notify('notify_async1','sample message1');
+SELECT pg_notify('notify_async1','');
+SELECT pg_notify('notify_async1',NULL);
+
+-- Should fail. Send a valid message via an invalid channel name
+SELECT pg_notify('','sample message1');
+SELECT pg_notify(NULL,'sample message1');
+SELECT pg_notify('notify_async_channel_name_too_long______________________________','sample_message1');
+
+--Should work. Valid NOTIFY/LISTEN/UNLISTEN commands
+NOTIFY notify_async2;
+LISTEN notify_async2;
+UNLISTEN notify_async2;
+UNLISTEN *;