BEGIN;
CREATE EXTENSION IF NOT EXISTS anon CASCADE;
SELECT anon.init();
 init 
------
 t
(1 row)

TRUNCATE anon.email;
COPY anon.email
  FROM PROGRAM
  '/usr/bin/python3 $(pg_config --sharedir)/extension/anon/populate.py --table email --lines 500';
SELECT count(DISTINCT val)=500 FROM anon.email;
 ?column? 
----------
 t
(1 row)

ROLLBACK;