diff --git a/test/WakuRlnV2.fuzz.t.sol b/test/WakuRlnV2.fuzz.t.sol
new file mode 100644
index 0000000..270a0df
--- /dev/null
+++ b/test/WakuRlnV2.fuzz.t.sol
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity >=0.8.19 <0.9.0;
+
+import "../src/Membership.sol";
+import "../src/WakuRlnV2.sol";
+import "forge-std/console.sol"; // solhint-disable-line
+import "forge-std/Vm.sol";
+import { DeployPriceCalculator, DeployWakuRlnV2, DeployProxy } from "../script/Deploy.s.sol"; // solhint-disable-line
+import { DeployTokenWithProxy } from "../script/DeployTokenWithProxy.s.sol";
+import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
+import { ERC1967Proxy } from "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";
+import { IPriceCalculator } from "../src/IPriceCalculator.sol";
+import { LinearPriceCalculator } from "../src/LinearPriceCalculator.sol";
+import { PoseidonT3 } from "poseidon-solidity/PoseidonT3.sol";
+import { Test } from "forge-std/Test.sol"; // For signature manipulation
+import { TestStableToken } from "./TestStableToken.sol";
+import { UUPSUpgradeable } from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
+
+contract WakuRlnV2Test is Test {
+    WakuRlnV2 internal w;
+    TestStableToken internal token;
+    DeployTokenWithProxy internal tokenDeployer;
+
+    address internal deployer;
+
+    uint256[] internal noIdCommitmentsToErase = new uint256[](0);
+
+    function setUp() public virtual {
+        // Deploy TestStableToken through proxy using deployment script
+        tokenDeployer = new DeployTokenWithProxy();
+        ERC1967Proxy tokenProxy = tokenDeployer.deploy();
+        token = TestStableToken(address(tokenProxy));
+
+        IPriceCalculator priceCalculator = (new DeployPriceCalculator()).deploy(address(token));
+        WakuRlnV2 wakuRlnV2 = (new DeployWakuRlnV2()).deploy();
+        ERC1967Proxy proxy = (new DeployProxy()).deploy(address(priceCalculator), address(wakuRlnV2));
+
+        w = WakuRlnV2(address(proxy));
+
+        // Log owner for debugging
+        console.log("WakuRlnV2 owner: ", w.owner());
+
+        // Minting a large number of tokens to not have to worry about
+        // Not having enough balance
+        // 900_000 ether is chosen to be well above any test requirements and is within the new max supply constraints.
+        vm.prank(address(tokenDeployer));
+        token.mint(address(this), 900_000 ether);
+    }
+
+    function testFuzz_RegisterInvalid(uint256 idCommitment, uint32 rateLimit) external {
+        vm.assume(idCommitment >= w.Q() || idCommitment == 0); // Invalid ID
+        (, uint256 price) = w.priceCalculator().calculate(rateLimit);
+        token.approve(address(w), price);
+        vm.expectRevert(); // Generic or specific error
+        w.register(idCommitment, rateLimit, new uint256[](0));
+    }
+}