Listen to change in one column on PostgreSQL

function-script.sql

create or replace function test_notify() 
returns trigger 
language plpgsql
as $function$
begin
	if ((new.status = '1' and old.status = '0') or (new.status = '0' and old.status = '1')) then
		perform pg_notify('testEvent', row_to_json(new)::text);
	end if;
	return null;
end;
$function$

trigger-script.sql

create trigger test_trigger after
update of status on table_test for each row execute procedure test_notify();