diff --git a/foundry.toml b/foundry.toml
index 2444e38..1897827 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -3,6 +3,11 @@ src = "src"
 out = "out"
 libs = ["lib"]
 
+# fuzz test times
+fuzz_runs = 2048
+# fuzz test max time
+fuzz_max_time = 60
+
 ffi = true
 ast = true
 build_info = true
diff --git a/lcov.info b/lcov.info
index d3dad5e..3b09204 100644
--- a/lcov.info
+++ b/lcov.info
@@ -1,12 +1,12 @@
 TN:
 SF:script/DeployContracts.s.sol
 FN:48,DeployContracts.run
-FNDA:29,DeployContracts.run
-DA:50,29
-BRDA:50,0,0,29
+FNDA:34,DeployContracts.run
+DA:50,34
+BRDA:50,0,0,34
 BRDA:50,0,1,-
-DA:51,29
-DA:52,29
+DA:51,34
+DA:52,34
 DA:53,0
 BRDA:53,1,0,-
 BRDA:53,1,1,-
@@ -16,26 +16,26 @@ DA:69,0
 BRDA:69,2,0,-
 DA:70,0
 DA:72,0
-DA:87,29
+DA:87,34
 FN:91,DeployContracts.deploymentsOnLocalNetwork
 FNDA:0,DeployContracts.deploymentsOnLocalNetwork
-DA:92,29
-DA:93,29
-DA:94,29
-DA:95,29
-DA:96,29
-DA:97,29
-DA:108,29
-DA:109,29
-DA:116,29
-DA:119,29
-DA:122,29
-DA:125,29
-DA:127,29
-DA:129,29
-DA:131,29
-DA:132,29
-DA:134,29
+DA:92,34
+DA:93,34
+DA:94,34
+DA:95,34
+DA:96,34
+DA:97,34
+DA:108,34
+DA:109,34
+DA:116,34
+DA:119,34
+DA:122,34
+DA:125,34
+DA:127,34
+DA:129,34
+DA:131,34
+DA:132,34
+DA:134,34
 FNF:2
 FNH:1
 LF:27
@@ -78,23 +78,23 @@ end_of_record
 TN:
 SF:src/ERC20UpgradeableTokenV1.sol
 FN:34,ERC20UpgradeableTokenV1.
-FNDA:42,ERC20UpgradeableTokenV1.
-DA:35,42
+FNDA:47,ERC20UpgradeableTokenV1.
+DA:35,47
 FN:38,ERC20UpgradeableTokenV1.initialize
-FNDA:41,ERC20UpgradeableTokenV1.initialize
-DA:47,41
+FNDA:46,ERC20UpgradeableTokenV1.initialize
+DA:47,46
 BRDA:47,0,0,-
-DA:48,41
-DA:49,41
-DA:50,41
-DA:51,41
-DA:52,41
-DA:53,41
-DA:55,41
-DA:56,41
-DA:57,41
-DA:58,41
-DA:59,41
+DA:48,46
+DA:49,46
+DA:50,46
+DA:51,46
+DA:52,46
+DA:53,46
+DA:55,46
+DA:56,46
+DA:57,46
+DA:58,46
+DA:59,46
 FN:62,ERC20UpgradeableTokenV1.pause
 FNDA:1,ERC20UpgradeableTokenV1.pause
 DA:63,1
@@ -102,16 +102,16 @@ FN:66,ERC20UpgradeableTokenV1.unpause
 FNDA:1,ERC20UpgradeableTokenV1.unpause
 DA:67,1
 FN:70,ERC20UpgradeableTokenV1.mint
-FNDA:104,ERC20UpgradeableTokenV1.mint
-DA:71,104
+FNDA:120,ERC20UpgradeableTokenV1.mint
+DA:71,120
 FN:79,ERC20UpgradeableTokenV1.burnByBurner
-FNDA:12,ERC20UpgradeableTokenV1.burnByBurner
-DA:80,10
+FNDA:13,ERC20UpgradeableTokenV1.burnByBurner
+DA:80,11
 FN:83,ERC20UpgradeableTokenV1._authorizeUpgrade
 FNDA:1,ERC20UpgradeableTokenV1._authorizeUpgrade
 FN:86,ERC20UpgradeableTokenV1._update
-FNDA:121,ERC20UpgradeableTokenV1._update
-DA:90,121
+FNDA:138,ERC20UpgradeableTokenV1._update
+DA:90,138
 FNF:8
 FNH:8
 LF:18
@@ -122,33 +122,33 @@ end_of_record
 TN:
 SF:src/GovToken.sol
 FN:27,GovToken.
-FNDA:41,GovToken.
-DA:35,41
+FNDA:46,GovToken.
+DA:35,46
 BRDA:35,0,0,-
-DA:37,41
-DA:38,41
-DA:39,41
-DA:40,41
-DA:41,41
+DA:37,46
+DA:38,46
+DA:39,46
+DA:40,46
+DA:41,46
 FN:49,GovToken._update
-FNDA:74,GovToken._update
-DA:52,74
+FNDA:81,GovToken._update
+DA:52,81
 BRDA:52,1,0,4
 DA:53,4
-DA:55,70
+DA:55,77
 FN:65,GovToken.burnByBurner
 FNDA:7,GovToken.burnByBurner
 DA:66,5
 FN:69,GovToken.mint
-FNDA:67,GovToken.mint
-DA:70,65
+FNDA:74,GovToken.mint
+DA:70,72
 FN:79,GovToken.setBurnedAmountOfUtilToken
-FNDA:13,GovToken.setBurnedAmountOfUtilToken
-DA:83,11
-DA:84,11
+FNDA:14,GovToken.setBurnedAmountOfUtilToken
+DA:83,12
+DA:84,12
 FN:87,GovToken.clock
 FNDA:0,GovToken.clock
-DA:88,70
+DA:88,77
 FN:92,GovToken.CLOCK_MODE
 FNDA:0,GovToken.CLOCK_MODE
 DA:93,0
@@ -217,48 +217,48 @@ end_of_record
 TN:
 SF:src/VotingPowerExchange.sol
 FN:66,VotingPowerExchange.
-FNDA:40,VotingPowerExchange.
-DA:69,40
-BRDA:69,0,0,1
-DA:70,39
-BRDA:70,1,0,-
-DA:71,0
-DA:74,39
-DA:75,39
-DA:76,39
-DA:77,39
-DA:78,39
-DA:79,39
+FNDA:49,VotingPowerExchange.
+DA:69,49
+BRDA:69,0,0,2
+DA:70,47
+BRDA:70,1,0,2
+DA:71,2
+DA:74,45
+DA:75,45
+DA:76,45
+DA:77,45
+DA:78,45
+DA:79,45
 FN:98,VotingPowerExchange.exchange
-FNDA:11,VotingPowerExchange.exchange
-DA:102,11
+FNDA:16,VotingPowerExchange.exchange
+DA:102,16
 BRDA:102,2,0,1
-DA:103,10
-BRDA:103,3,0,-
-DA:104,10
-BRDA:104,4,0,-
-DA:105,10
+DA:103,15
+BRDA:103,3,0,1
+DA:104,14
+BRDA:104,4,0,1
+DA:105,13
 BRDA:105,5,0,1
-DA:107,9
-DA:108,9
-BRDA:108,6,0,1
-DA:109,1
-DA:113,8
-DA:114,8
-BRDA:114,7,0,1
-DA:115,1
-DA:119,7
-DA:121,7
-DA:125,7
-DA:127,7
-DA:129,7
+DA:107,12
+DA:108,12
+BRDA:108,6,0,2
+DA:109,2
+DA:113,10
+DA:114,10
+BRDA:114,7,0,2
+DA:115,2
+DA:119,8
+DA:121,8
+DA:125,8
+DA:127,8
+DA:129,8
 BRDA:129,8,0,1
 DA:131,1
 DA:133,1
-DA:137,7
-DA:140,7
-DA:143,7
-DA:144,7
+DA:137,8
+DA:140,8
+DA:143,8
+DA:144,8
 FN:152,VotingPowerExchange.setVotingPowerCap
 FNDA:4,VotingPowerExchange.setVotingPowerCap
 DA:153,3
@@ -266,21 +266,21 @@ BRDA:153,9,0,2
 DA:154,1
 FN:160,VotingPowerExchange.authorizationState
 FNDA:8,VotingPowerExchange.authorizationState
-DA:161,18
+DA:161,22
 FN:172,VotingPowerExchange._setVotingPowerCap
-FNDA:40,VotingPowerExchange._setVotingPowerCap
-DA:173,40
-DA:174,40
+FNDA:46,VotingPowerExchange._setVotingPowerCap
+DA:173,46
+DA:174,46
 FN:187,VotingPowerExchange.calculateIncrementedVotingPower
 FNDA:26,VotingPowerExchange.calculateIncrementedVotingPower
-DA:192,33
-DA:193,33
+DA:192,34
+DA:193,34
 FN:204,VotingPowerExchange.calculateVotingPowerFromBurnedAmount
 FNDA:117,VotingPowerExchange.calculateVotingPowerFromBurnedAmount
-DA:206,183
-DA:208,183
-DA:210,183
-DA:211,183
+DA:206,185
+DA:208,185
+DA:210,185
+DA:211,185
 FN:221,VotingPowerExchange.calculateIncrementedBurningAmount
 FNDA:26,VotingPowerExchange.calculateIncrementedBurningAmount
 DA:226,27
@@ -300,27 +300,27 @@ DA:261,1
 DA:262,1
 DA:263,1
 FN:270,VotingPowerExchange.getTokenAddresses
-FNDA:0,VotingPowerExchange.getTokenAddresses
-DA:271,0
-DA:272,0
+FNDA:1,VotingPowerExchange.getTokenAddresses
+DA:271,1
+DA:272,1
 FNF:12
-FNH:11
+FNH:12
 LF:53
-LH:50
+LH:53
 BRF:10
-BRH:7
+BRH:10
 end_of_record
 TN:
 SF:test/integration/utils/VotingPowerExchangeTestHelper.t.sol
 FN:15,VotingPowerExchangeTestHelper.generateSignatureFromPrivateKey
-FNDA:10,VotingPowerExchangeTestHelper.generateSignatureFromPrivateKey
-DA:22,10
-DA:23,10
-DA:24,10
-DA:26,10
-DA:36,10
-DA:38,10
-DA:40,10
+FNDA:15,VotingPowerExchangeTestHelper.generateSignatureFromPrivateKey
+DA:22,15
+DA:23,15
+DA:24,15
+DA:26,15
+DA:36,15
+DA:38,15
+DA:40,15
 FNF:1
 FNH:1
 LF:7
diff --git a/test/fuzz/FuzzVotingPowerExchange.t.sol b/test/fuzz/FuzzVotingPowerExchange.t.sol
new file mode 100644
index 0000000..f4d88d7
--- /dev/null
+++ b/test/fuzz/FuzzVotingPowerExchange.t.sol
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.8.24;
+
+import {Test, console} from "forge-std/Test.sol";
+import {PausableUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol";
+import {AmbassadorNft} from "src/AmbassadorNft.sol";
+import {DeployContracts, DeploymentResult} from "script/DeployContracts.s.sol";
+import {ERC20UpgradeableTokenV1} from "src/ERC20UpgradeableTokenV1.sol";
+import {GovToken} from "src/GovToken.sol";
+import {VotingPowerExchange} from "src/VotingPowerExchange.sol";
+import {VotingPowerExchangeTestHelper} from "../integration/utils/VotingPowerExchangeTestHelper.t.sol";
+import {MessageHashUtils} from "lib/openzeppelin-contracts/contracts/utils/cryptography/MessageHashUtils.sol";
+
+contract VotingPwoerExchangeTest is Test {
+     // instances
+    GovToken public govToken;
+    ERC20UpgradeableTokenV1 public utilityToken;
+    VotingPowerExchange public votingPowerExchange;
+    DeployContracts public dc;
+    VotingPowerExchangeTestHelper public helper;
+
+    DeploymentResult result;
+
+    // admin roles
+    address admin;
+    address pauser;
+    address minter;
+    address burner;
+    address manager;
+    address exchanger;
+
+    // users for testing
+    address public user = makeAddr("user");
+    address public user2 = makeAddr("user2");
+
+    // user for testing exchange
+    address public participant = makeAddr("levelUpper2");
+    address public participant2;
+
+    // private key
+    uint256 public default_anvil_key2 = 0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d;
+
+    // deploy scripts
+    function setUp() public {
+        dc = new DeployContracts();
+        result = dc.run();
+
+        utilityToken = ERC20UpgradeableTokenV1(result.utilityToken);
+        govToken = GovToken(result.govToken);
+        votingPowerExchange = VotingPowerExchange(result.exchange);
+        admin = result.admin;
+        pauser = result.pauser;
+        minter = result.minter;
+        burner = result.burner;
+        manager = result.manager;
+        exchanger = result.exchanger;
+        participant2 = vm.addr(dc.DEFAULT_ANVIL_KEY2());
+
+        vm.startPrank(minter);
+        govToken.mint(user, 15 * 1e17);
+        utilityToken.mint(user, 1_000 * 1e18);
+        utilityToken.mint(participant, 100_000 * 1e18);
+        utilityToken.mint(participant2, 10_000 * 1e18);
+        vm.stopPrank();
+
+        // set up the roles for exchange contract
+
+        helper = new VotingPowerExchangeTestHelper();
+
+        // other setup
+        vm.label(participant, "participant");
+        vm.label(participant2, "participant2");
+        vm.label(user, "user");
+        vm.label(user2, "user2");
+    }
+
+    function testFuzz_exchange(uint256 amount) public {
+    }
+}
diff --git a/test/unit/GovToken.t.sol b/test/unit/GovToken.t.sol
index 2dd0342..f2b3fa7 100644
--- a/test/unit/GovToken.t.sol
+++ b/test/unit/GovToken.t.sol
@@ -200,7 +200,7 @@ contract GovTokenTest is Test {
         assertEq(govToken.burnedAmountOfUtilToken(user2), 100 ether);
     }
 
-    function testNonRoleCannnotCallSetBurnedAmountOfUtilToken() public {
+    function testNonRoleCannotCallSetBurnedAmountOfUtilToken() public {
         vm.startPrank(user);
         vm.expectRevert();
         govToken.setBurnedAmountOfUtilToken(user, 100 ether);