pub fn default_system_env() -> SystemEnv {
    SystemEnv {
        zk_porter_available: ZKPORTER_IS_AVAILABLE,
        version: ProtocolVersionId::latest(),
        base_system_smart_contracts: BaseSystemContracts::load_from_disk(),
        bootloader_gas_limit: u32::MAX,
        execution_mode: TxExecutionMode::VerifyExecute,
        default_validation_computational_gas_limit: u32::MAX,
        chain_id: L2ChainId::from(270),
    }
}
Creates a mock system env with reasonable params.
core/node/test_utils/src/lib.rs