feat(validium): Toggle require proof in mock contract

src/mocks/ScrollChainValidiumMock.sol

@@ -6,21 +6,51 @@ import {IL1MessageQueueV2} from "../L1/rollup/IL1MessageQueueV2.sol";
 
 import {ScrollChainValidium} from "../validium/ScrollChainValidium.sol";
 
+/// @title ScrollChainValidiumMock
+/// @dev This contract should only be deployed on testnet.
 contract ScrollChainValidiumMock is ScrollChainValidium {
+    /*********************
+     * Storage Variables *
+     *********************/
+
+    /// @notice If set to false, we allow finalizing bundles with an arbitrary (or empty) proof.
+    bool public requireProof;
+
+    /***************
+     * Constructor *
+     ***************/
+
     constructor(
         uint64 _chainId,
         address _messageQueueV2,
         address _verifier
     ) ScrollChainValidium(_chainId, _messageQueueV2, _verifier) {}
 
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    function setRequireProof(bool _requireProof) external onlyRole(DEFAULT_ADMIN_ROLE) {
+        requireProof = _requireProof;
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
     /// @dev Internal function to finalize a bundle.
     /// @param batchHeader The header of the last batch in this bundle.
     /// @param totalL1MessagesPoppedOverall The number of messages processed after this bundle.
+    /// @param aggrProof The bundle proof for this bundle.
     function _finalizeBundle(
         bytes calldata batchHeader,
         uint256 totalL1MessagesPoppedOverall,
-        bytes calldata
+        bytes calldata aggrProof
     ) internal virtual override {
+        if (requireProof) {
+            return super._finalizeBundle(batchHeader, totalL1MessagesPoppedOverall, aggrProof);
+        }
+
         // actions before verification
         (, bytes32 batchHash, uint256 batchIndex, ) = _beforeFinalizeBatch(batchHeader);
 

src/validium/ScrollChainValidium.sol

@@ -112,6 +112,9 @@ contract ScrollChainValidium is AccessControlUpgradeable, PausableUpgradeable, I
     /// @dev An array of encryption keys.
     EncryptionKey[] public encryptionKeys;
 
+    /// @dev The storage slots reserved for future usage.
+    uint256[50] private __gap;
+
     /***************
      * Constructor *
      ***************/