Method attempt

test/engine/test_pool.py:1856–1863

(conn)

            conn.close()

        def attempt(conn):
            time.sleep(random.random())
            try:
                conn._handle_dbapi_exception(
                    Error(), "statement", {}, Mock(), Mock()
                )
            except tsa.exc.DBAPIError:
                pass

        # run an error + invalidate operation on the remaining 7 open
        # connections