BEGIN;
CREATE SCHEMA test;
CREATE EXTENSION pg_doctest SCHEMA test;
SELECT passed FROM test.test_call('SELECT 1','1');
 passed 
--------
 t
(1 row)

CREATE SCHEMA z;
CREATE FUNCTION z.is_bob(n TEXT) RETURNS BOOLEAN LANGUAGE SQL
AS $$
-- >>> WITH person AS (
-- >>>   SELECT 'alice' AS firstname
-- >>> )
-- >>> SELECT z.is_bob(p.firstname)
-- >>> FROM person p;
-- false

SELECT n = 'bob'
$$;
SELECT * FROM test.run('z');
 function_name | passed | failed 
---------------+--------+--------
 z.is_bob      |      1 |      0
(1 row)

ROLLBACK;