You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: transaction_relay_low_fee_rate.rs
    path of file: ./repos/ckb/test/src/specs/relay
    
    the code of the file until where you have to start completion: use crate::node::connect_all;
use crate::node::waiting_for_sync;
use crate::util::cell::{as_input, as_output, gen_spendable};
use crate::util::log_monitor
    
    fn before_run(&self) -> Vec<Node> {
        let mut node0 = Node::new(self.name(), "node0");
        let mut node1 = Node::new(self.name(), "node1");

        node0.modify_app_config(|config: &mut ckb_app_config::CKBAppConfig| {
            config.tx_pool.min_fee_rate = FeeRate::from_u64(0);
        });
        node0.start();

        node1.modify_app_config(|config: &mut ckb_app_config::CKBAppConfig| {
            config.tx_pool.min_fee_rate = FeeRate::from_u64(1_000);
        });
        node1.start();
        vec![node0, node1]
    }