unique test methods zen

INSERT INTO test_1 (id, test_class, test_method, old_ids)
  SELECT
    ss.id,
    ss.test_class,
    ss.test_method,
    array_agg(old_id) old_id
  FROM (SELECT
          tm.id          id,
          tm.test_class  test_class,
          tm.test_method test_method,
          t.id           old_id
        FROM (SELECT
                min(id) id,
                test_class,
                test_method
              FROM test
              GROUP BY test_class, test_method
              ORDER BY min(id)) tm
          INNER JOIN test t
            ON (t.test_class = tm.test_class AND
                t.test_method = tm.test_method)) ss
  GROUP BY ss.id, ss.test_class, ss.test_method;