foundry/testdata/default/cheats/GasMetering.t.sol at master · LIT-Protocol/foundry · GitHub

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// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity ^0.8.18;

import "ds-test/test.sol";
import "cheats/Vm.sol";

contract B {
    function a() public returns (uint256) {
        return 100;
    }
}

contract GasMeteringTest is DSTest {
    Vm constant vm = Vm(HEVM_ADDRESS);

    function testGasMetering() public {
        uint256 gas_start = gasleft();

        consumeGas();

        uint256 gas_end_normal = gas_start - gasleft();

        vm.pauseGasMetering();
        uint256 gas_start_not_metered = gasleft();

        consumeGas();

        uint256 gas_end_not_metered = gas_start_not_metered - gasleft();
        vm.resumeGasMetering();

        uint256 gas_start_metered = gasleft();

        consumeGas();

        uint256 gas_end_resume_metered = gas_start_metered - gasleft();

        assertEq(gas_end_normal, gas_end_resume_metered);
        assertEq(gas_end_not_metered, 0);
    }

    function testGasMeteringExternal() public {
        B b = new B();
        uint256 gas_start = gasleft();

        b.a();

        uint256 gas_end_normal = gas_start - gasleft();

        vm.pauseGasMetering();
        uint256 gas_start_not_metered = gasleft();

        b.a();

        uint256 gas_end_not_metered = gas_start_not_metered - gasleft();
        vm.resumeGasMetering();

        uint256 gas_start_metered = gasleft();

        b.a();

        uint256 gas_end_resume_metered = gas_start_metered - gasleft();

        assertEq(gas_end_normal, gas_end_resume_metered);
        assertEq(gas_end_not_metered, 0);
    }

    function testGasMeteringContractCreate() public {
        vm.pauseGasMetering();
        uint256 gas_start_not_metered = gasleft();

        B b = new B();

        uint256 gas_end_not_metered = gas_start_not_metered - gasleft();
        vm.resumeGasMetering();

        assertEq(gas_end_not_metered, 0);
    }

    function consumeGas() internal returns (uint256 x) {
        for (uint256 i; i < 10000; i++) {
            x += i;
        }
    }
}