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This example demonstrates how to start a short-lived Fuel node with custom consensus parameters for the underlying chain.

First, we have to import ConsensusParameters and ChainConfig:

use fuels::{
    prelude::*,
    tx::{ConsensusParameters, FeeParameters, TxParameters},
};

Next, we can define some values for the consensus parameters:

let tx_params = TxParameters::default()
    .with_max_gas_per_tx(1_000)
    .with_max_inputs(2);
let fee_params = FeeParameters::default().with_gas_price_factor(10);
 
let consensus_parameters = ConsensusParameters {
    tx_params,
    fee_params,
    ..Default::default()
};
 
let chain_config = ChainConfig {
    consensus_parameters,
    ..ChainConfig::default()
};

Before we can start a node, we probably also want to define some genesis coins and assign them to an address:

let wallet = WalletUnlocked::new_random(None);
let coins = setup_single_asset_coins(
    wallet.address(),
    Default::default(),
    DEFAULT_NUM_COINS,
    DEFAULT_COIN_AMOUNT,
);

Finally, we call setup_test_provider(), which starts a node with the given configurations and returns a provider attached to that node:

let node_config = Config::default();
let _provider =
    setup_test_provider(coins, vec![], Some(node_config), Some(chain_config)).await?;