Add test

Author: CherkashinSergey

expected/pg_variables_trans.out

@@ -2005,6 +2005,25 @@ SELECT package FROM pgv_stats() ORDER BY package;
 ---------
 (0 rows)
 
+SELECT pgv_set('vars', 'any1', 'some value'::text);
+ pgv_set 
+---------
+ 
+(1 row)
+
+BEGIN;
+SELECT pgv_remove('vars');
+ pgv_remove 
+------------
+ 
+(1 row)
+
+ROLLBACK;
+SELECT package FROM pgv_stats() ORDER BY package;
+ package 
+---------
+(0 rows)
+
 SELECT pgv_free();
  pgv_free 
 ----------

sql/pg_variables_trans.sql

@@ -525,4 +525,10 @@ SELECT package FROM pgv_stats() ORDER BY package;
 COMMIT;
 SELECT package FROM pgv_stats() ORDER BY package;
 
+SELECT pgv_set('vars', 'any1', 'some value'::text);
+BEGIN;
+SELECT pgv_remove('vars');
+ROLLBACK;
+SELECT package FROM pgv_stats() ORDER BY package;
+
 SELECT pgv_free();