minor fix for the voting power exchange

Author: thurendous

src/VotingPowerExchange.sol

@@ -46,6 +46,7 @@ contract VotingPowerExchange is AccessControl, EIP712 {
     uint256 private constant PRECISION_FIX = 1e9;
     uint256 private constant PRECISION_FACTOR = 10;
     uint256 private constant PRECISION = 1e18;
+    uint256 private constant ALLOWED_EXCHANGING_MINIMUM_AMOUNT = 1e18;
 
     // token instances
     IGovToken private immutable govToken;
@@ -99,7 +100,7 @@ contract VotingPowerExchange is AccessControl, EIP712 {
         onlyRole(EXCHANGER_ROLE)
     {
         if (sender == address(0)) revert VotingPowerExchange__AddressIsZero();
-        if (amount < 1e18) revert VotingPowerExchange__AmountIsTooSmall(); // not allow to exchange less than 1 utility token
+        if (amount < ALLOWED_EXCHANGING_MINIMUM_AMOUNT) revert VotingPowerExchange__AmountIsTooSmall(); // not allow to exchange less than 1 utility token
         if (authorizationState(sender, nonce)) revert VotingPowerExchange__InvalidNonce();
         if (block.timestamp > expiration) revert VotingPowerExchange__SignatureExpired();
         // check the current gove token balance of the sender
@@ -254,12 +255,19 @@ contract VotingPowerExchange is AccessControl, EIP712 {
     function getConstants()
         external
         pure
-        returns (bytes32 __EXCHANGE_TYPEHASH, uint256 _PRECISION_FIX, uint256 _PRECISION_FACTOR, uint256 _PRECISION)
+        returns (
+            bytes32 __EXCHANGE_TYPEHASH,
+            uint256 _PRECISION_FIX,
+            uint256 _PRECISION_FACTOR,
+            uint256 _PRECISION,
+            uint256 _ALLOWED_EXCHANGING_MINIMUM_AMOUNT
+        )
     {
         __EXCHANGE_TYPEHASH = _EXCHANGE_TYPEHASH;
         _PRECISION_FIX = PRECISION_FIX;
         _PRECISION_FACTOR = PRECISION_FACTOR;
         _PRECISION = PRECISION;
+        _ALLOWED_EXCHANGING_MINIMUM_AMOUNT = ALLOWED_EXCHANGING_MINIMUM_AMOUNT;
     }
 
     /**

test/integration/VotingPowerExchange.t.sol

@@ -222,15 +222,21 @@ contract VotingPowerExchangeTest is Test {
     }
 
     function testConstantValues() public view {
-        (bytes32 __EXCHANGE_TYPEHASH, uint256 _PRICISION_FIX, uint256 _PRICISION_FACTOR, uint256 _PRICISION) =
-            votingPowerExchange.getConstants();
+        (
+            bytes32 __EXCHANGE_TYPEHASH,
+            uint256 _PRICISION_FIX,
+            uint256 _PRICISION_FACTOR,
+            uint256 _PRICISION,
+            uint256 _ALLOWED_EXCHANGING_MINIMUM_AMOUNT
+        ) = votingPowerExchange.getConstants();
 
         assertEq(
             __EXCHANGE_TYPEHASH, keccak256("Exchange(address sender,uint256 amount,bytes32 nonce,uint256 expiration)")
         );
         assertEq(_PRICISION, 1e18);
         assertEq(_PRICISION_FACTOR, 10);
         assertEq(_PRICISION_FIX, 1e9);
+        assertEq(_ALLOWED_EXCHANGING_MINIMUM_AMOUNT, 1e18);
     }
 
     function testVotingPowerCap() public view {

test/mocks/ERC20UpgradeableTokenV2.sol

@@ -8,7 +8,7 @@ import "src/ERC20UpgradeableTokenV1.sol";
 contract ERC20UpgradeableTokenV2 is ERC20UpgradeableTokenV1 {
     bytes32 public constant TREASURY_ROLE = keccak256("TREASURY_ROLE");
 
-    address private _treasury;
+    address private _treasury; // dummy state variable for testing
 
     /// @dev Initializes the V2 version of the contract.
     function initializeV2(address treasury, address newAdmin) public reinitializer(2) {

test/onChain/testBaseSepolia.sol

@@ -18,6 +18,10 @@ contract TestBaseSepolia is Test {
     }
 
     function testExchangeOnChain01() public {
+        if (block.chainid != 84532) {
+            console.log("Not on Base Sepolia");
+            return;
+        }
         // Set up the state required for the test (if needed)
         // For example, simulate a user address
         uint256 balanceBefore = utilityToken.balanceOf(0x588A7E62547CB573084C8608486d60E567c573d0);