postgresql/src/test/modules/test_extensions/sql/test_extensions.sql

-- test some errors
CREATE EXTENSION test_ext1;
CREATE EXTENSION test_ext1 SCHEMA test_ext1;
CREATE EXTENSION test_ext1 SCHEMA test_ext;
CREATE SCHEMA test_ext;
CREATE EXTENSION test_ext1 SCHEMA test_ext;

-- finally success
CREATE EXTENSION test_ext1 SCHEMA test_ext CASCADE;

SELECT extname, nspname, extversion, extrelocatable FROM pg_extension e, pg_namespace n WHERE extname LIKE 'test_ext%' AND e.extnamespace = n.oid ORDER BY 1;

CREATE EXTENSION test_ext_cyclic1 CASCADE;

DROP SCHEMA test_ext CASCADE;

CREATE EXTENSION test_ext6;
DROP EXTENSION test_ext6;
CREATE EXTENSION test_ext6;

-- test dropping of member tables that own extensions:
-- this table will be absorbed into test_ext7
create table old_table1 (col1 serial primary key);
create extension test_ext7;
\dx+ test_ext7
alter extension test_ext7 update to '2.0';
\dx+ test_ext7

-- test handling of temp objects created by extensions
create extension test_ext8;

-- \dx+ would expose a variable pg_temp_nn schema name, so we can't use it here
select regexp_replace(pg_describe_object(classid, objid, objsubid),
                      'pg_temp_\d+', 'pg_temp', 'g') as "Object Description"
from pg_depend
where refclassid = 'pg_extension'::regclass and deptype = 'e' and
  refobjid = (select oid from pg_extension where extname = 'test_ext8')
order by 1;

-- Should be possible to drop and recreate this extension
drop extension test_ext8;
create extension test_ext8;

select regexp_replace(pg_describe_object(classid, objid, objsubid),
                      'pg_temp_\d+', 'pg_temp', 'g') as "Object Description"
from pg_depend
where refclassid = 'pg_extension'::regclass and deptype = 'e' and
  refobjid = (select oid from pg_extension where extname = 'test_ext8')
order by 1;

-- here we want to start a new session and wait till old one is gone
select pg_backend_pid() as oldpid \gset
\c -
do 'declare c int = 0;
begin
  while (select count(*) from pg_stat_activity where pid = '
    :'oldpid'
  ') > 0 loop c := c + 1; end loop;
  raise log ''test_extensions looped % times'', c;
end';

-- extension should now contain no temp objects
\dx+ test_ext8

-- dropping it should still work
drop extension test_ext8;