proposal-22-governance-and-rewards-patch/test/TestRewards.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;

import { console2 } from "@forge-std/console2.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import { MockProposal } from "./MockProposal.sol";
import { GovernancePatchUpgrade } from "@root/v4-patch/GovernancePatchUpgrade.sol";
import { RelayerRegistry } from "@root/v4-patch/RelayerRegistry.sol";
import { TornadoStakingRewards } from "@root/v4-patch/TornadoStakingRewards.sol";

contract TestGovernanceStakingRewards is MockProposal {
    modifier replenishGovernanceStakingBalanceBefore() {
        vm.startPrank(_governanceAddress);
        IERC20(_tokenAddress).transfer(getStakingProxyAddress(), 100_000 ether);
        vm.stopPrank();
        _;
    }

    function burnTokens(address caller, uint256 amount, TornadoStakingRewards staking) internal {
        vm.startPrank(caller);
        staking.addBurnRewards(amount);
        vm.stopPrank();
    }

    function testAccumulatedRewardCanBeUpdated() public executeAttackerProposalBefore executeCurrentProposalBefore {
        TornadoStakingRewards staking = TornadoStakingRewards(getStakingProxyAddress());

        uint256 accumulatedRewardPerTornBeforeBurning = staking.accumulatedRewardPerTorn() / _tornMaximumSupply;

        console2.log("Accumulated reward per TORN right after proposal execution: %s TORN", accumulatedRewardPerTornBeforeBurning / 10e17);

        burnTokens(_governanceAddress, 10_000_000 ether, staking);

        uint256 accumulatedRewardPerTornAfterBurning = staking.accumulatedRewardPerTorn() / _tornMaximumSupply;

        console2.log("Accumulated reward per TORN after burning 10 000 000 TORN: ~ %s TORN", accumulatedRewardPerTornAfterBurning / 10e17);

        require(accumulatedRewardPerTornAfterBurning > accumulatedRewardPerTornBeforeBurning, "Staking rewards isn't updated");
    }

    function testStakerCanGetRewards()
        public
        executeAttackerProposalBefore
        executeCurrentProposalBefore
        replenishGovernanceStakingBalanceBefore
    {
        TornadoStakingRewards staking = TornadoStakingRewards(getStakingProxyAddress());
        IERC20 TORN = IERC20(_tokenAddress);

        uint256 toBurn = 10_000 ether;

        // Remind that we have locked in Governance 25 000 TORN for TEST_ADDRESS_ONE while voting
        uint256 stakerLockedBalance = governance.lockedBalance(TEST_ADDRESS_ONE);
        require(stakerLockedBalance == 25_000 ether, "Invalid test staker locked balance");

        uint256 stakerRewardsBeforeBurning = staking.checkReward(TEST_ADDRESS_ONE);
        console2.log("Staking rewards before burning: %s TORN", stakerRewardsBeforeBurning / 10e17);

        burnTokens(_governanceAddress, toBurn, staking);

        uint256 stakerRewardsAfterBurning = staking.checkReward(TEST_ADDRESS_ONE);
        console2.log("Staking rewards after burning 10 000 TORN: %s TORN", stakerRewardsAfterBurning / 10e17);
        require(stakerRewardsAfterBurning > stakerRewardsBeforeBurning, "Rewards isn't changed after burning");

        // All TORN, locked by users in Governance, is on the userVault contract balance
        uint256 governanceLockedAmount = TORN.balanceOf(address(governance.userVault()));
        uint256 receivedReward = stakerRewardsAfterBurning - stakerRewardsBeforeBurning;
        uint256 expectedRewards = stakerLockedBalance * toBurn / governanceLockedAmount;

        console2.log("Expected staking rewards: %s TORN", expectedRewards / 10e17);
        console2.log("Staker received rewards: %s TORN", receivedReward / 10e17);

        require(receivedReward == expectedRewards, "Expected and received rewards don't match");

        uint256 stakerTORNbalanceBeforeGettingRewards = TORN.balanceOf(TEST_ADDRESS_ONE);
        console2.log("Staker balance before getting (withdrawal) collected rewards: %s TORN", stakerTORNbalanceBeforeGettingRewards / 10e17);

        vm.startPrank(TEST_ADDRESS_ONE);
        staking.getReward();
        vm.stopPrank();

        uint256 stakerTORNbalanceAfterGettingRewards = TORN.balanceOf(TEST_ADDRESS_ONE);
        console2.log("Staker balance after getting (withdrawal) collected rewards: %s TORN", stakerTORNbalanceAfterGettingRewards / 10e17);

        require(stakerTORNbalanceAfterGettingRewards > stakerTORNbalanceBeforeGettingRewards, "Rewards isn't withdrawed");
        require(
            stakerTORNbalanceAfterGettingRewards - stakerTORNbalanceBeforeGettingRewards == receivedReward,
            "Incorrect rewards amount withdrawed"
        );
    }

    function testCanBurnFromRelayerRegistry() public {
        TornadoStakingRewards staking = TornadoStakingRewards(getStakingProxyAddress());
        address relayerRegistryAddress = getRelayerRegistryProxyAddress();

        uint256 accumulatedRewardPerTornBeforeBurning = staking.accumulatedRewardPerTorn();

        burnTokens(relayerRegistryAddress, 10_000 ether, staking);

        require(staking.accumulatedRewardPerTorn() > accumulatedRewardPerTornBeforeBurning, "Burn from relayer registry failed");
    }
}