core::testing::get_unspent_gas

Returns the amount of gas available in the GasBuiltin, as well as the amount of gas unused in the local wallet. Useful for asserting that a certain amount of gas was used. Note: This function call costs exactly 2300 gas, so this may be ignored in calculations.

Examples

use core::testing::get_unspent_gas;

fn gas_heavy_function() {
    // ... some gas-intensive code
}

fn test_gas_consumption() {
    let gas_before = get_unspent_gas();
    gas_heavy_function();
    let gas_after = get_unspent_gas();
    assert!(gas_after - gas_before  u128 implicits(GasBuiltin) nopanic;