pub fn for_tests() -> Self {
        Self {
            gas_price_scale_factor: 1.2,
            gas_price_scale_factor_open_batch: Some(1.2),
            estimate_gas_scale_factor: 1.5,
            ..Self::default()
        }
    }
Creates a mock instance of `Web3JsonRpcConfig` to be used in tests.
Ports and some fields that may affect execution are set to the same values used by default in
the localhost environment. Other fields are set to default values.
core/lib/config/src/configs/api.rs