failed test

src/MerkleAirdrop.sol

@@ -77,7 +77,7 @@ contract MerkleAirdrop is EIP712 {
         }
 
         // check the signature
-        if (_isValidSignature(account, getMessage(account, amount), v, r, s)) {
+        if (_isValidSignature(account, getMessageHash(account, amount), v, r, s)) {
             revert MerkleAirdrop__SignatureInvalid();
         }
 
@@ -94,7 +94,7 @@ contract MerkleAirdrop is EIP712 {
         i_airdropToken.safeTransfer(account, amount);
     }
 
-    function getMessage(
+    function getMessageHash(
         address account,
         uint256 amount
     ) public view returns (bytes32) {

test/MerkleAirdropTest.t.sol

@@ -21,6 +21,7 @@ contract MerkleAirdropTest is ZkSyncChainChecker, Test {
         0xe5ebd1e1b5a5478a944ecab36a9a954ac3b6b8216875f6524caa7a1d87096576;
     bytes32[] public PROOF = [proofOne, proofTwo];
 
+    address public gasPayer;
     address user;
     uint256 userPrivKey;
 
@@ -34,15 +35,22 @@ contract MerkleAirdropTest is ZkSyncChainChecker, Test {
             airdrop = new MerkleAirdrop(ROOT, token);
             token.mint(token.owner(), AMOUNT_TO_SEND);
             token.transfer(address(airdrop), AMOUNT_TO_SEND);
-            (user, userPrivKey) = makeAddrAndKey("user");
         }
+        (user, userPrivKey) = makeAddrAndKey("user");
+        gasPayer = makeAddr("gasPayer");
     }
 
     function testUsersCanClaim() public {
         uint256 startingBalance = token.balanceOf(user);
+        bytes32 digest = airdrop.getMessageHash(user, AMOUNT_TO_CLAIM);
 
-        vm.prank(user);
-        airdrop.claim(user, AMOUNT_TO_CLAIM, PROOF);
+        // vm.prank(user);
+        // sign a message
+        (uint8 v, bytes32 r, bytes32 s) = vm.sign(userPrivKey, digest);
+
+        // gaspayer calls claim using the signed message
+        vm.prank(gasPayer);
+        airdrop.claim(user, AMOUNT_TO_CLAIM, PROOF, v, r, s);
 
         uint256 endingBalance = token.balanceOf(user);
         console.log("airdrop address this tokens:", endingBalance);