Regression tests for LISTEN/NOTIFY/UNLISTEN/pg_notify.

Robins Tharakan, reviewed by Szymon Guz

src/test/regress/expected/async.out

+--
+-- 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 *;

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

src/test/regress/serial_schedule

@@ -99,6 +99,7 @@ test: matview
 test: alter_generic
 test: misc
 test: psql
+test: async
 test: rules
 test: event_trigger
 test: select_views

src/test/regress/sql/async.sql

+--
+-- 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 *;