Test Execute result decoding, reentrancy

processor/ethereum/router/contracts/tests/CreateAddress.sol

@@ -3,7 +3,7 @@ pragma solidity ^0.8.26;
 
 import "Router.sol";
 
-// Wrap the Router with a contract which exposes the address
+// Wrap the Router with a contract which exposes the createAddress function
 contract CreateAddress is Router {
   constructor() Router(bytes32(uint256(1))) { }
 

processor/ethereum/router/contracts/tests/Reentrancy.sol

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+pragma solidity ^0.8.26;
+
+import "Router.sol";
+
+// This inherits from the Router for visibility over Reentered
+contract Reentrancy {
+  error Reentered();
+
+  constructor() {
+    (bool success, bytes memory res) =
+      msg.sender.call(abi.encodeWithSelector(Router.execute4DE42904.selector, ""));
+    require(!success);
+    // We can't compare `bytes memory` so we hash them and compare the hashes
+    require(keccak256(res) == keccak256(abi.encode(Reentered.selector)));
+  }
+}