pull in upstream requirements

these changes are ultimately requierd for use in the wrappers later, and they are generally good to have for any wrappers in the future.

Author: kaze-cow

src/CowWrapper.sol

@@ -49,7 +49,16 @@ interface ICowSettlement {
     }
 
     /// @notice Returns the authentication contract used by the settlement contract.
-    function authenticator() external returns (ICowAuthentication);
+    function authenticator() external view returns (ICowAuthentication);
+
+    /// @notice Returns the address of the vaultRelayer, the target for approvals for funds entering the settlement contract.
+    function vaultRelayer() external view returns (address);
+
+    /// @notice Returns the domain separator for EIP-712 signing
+    function domainSeparator() external view returns (bytes32);
+
+    /// @notice Allows for approval of orders by submitting an authorized hash on-chain prior to order execution.
+    function setPreSignature(bytes calldata orderUid, bool signed) external;
 
     /// @notice Settles a batch of trades atomically
     /// @param tokens Array of token addresses involved in the settlement
@@ -71,6 +80,10 @@ interface ICowWrapper {
     /// @notice A human readable label for this wrapper. Used for display in explorer/analysis UIs
     function name() external view returns (string memory);
 
+    /// @notice The settlement contract used by this wrapper
+    /// @return The CowSettlement contract address
+    function SETTLEMENT() external view returns (ICowSettlement);
+
     /// @notice Initiates a wrapped settlement call
     /// @dev This is the entry point for wrapped settlements. The wrapper will execute custom logic
     ///      before calling the next wrapper or settlement contract in the chain.

test/unit/mocks/MockCowProtocol.sol

@@ -3,7 +3,7 @@ pragma solidity ^0.8;
 
 import {ICowSettlement, ICowAuthentication, CowWrapper} from "../../../src/CowWrapper.sol";
 
-/// @title MockICowAuthentication
+/// @title MockCowAuthentication
 /// @notice Mock implementation of CoW Protocol authenticator for unit testing
 contract MockCowAuthentication is ICowAuthentication {
     mapping(address => bool) public solvers;
@@ -17,7 +17,7 @@ contract MockCowAuthentication is ICowAuthentication {
     }
 }
 
-/// @title MockICowSettlement
+/// @title MockCowSettlement
 /// @notice Mock implementation of CoW Protocol settlement contract for unit testing
 contract MockCowSettlement is ICowSettlement {
     ICowAuthentication public immutable AUTH;
@@ -31,22 +31,22 @@ contract MockCowSettlement is ICowSettlement {
         return AUTH;
     }
 
-    function vaultRelayer() external pure returns (address) {
+    function vaultRelayer() external pure override returns (address) {
         return address(0x7777);
     }
 
-    function domainSeparator() external pure returns (bytes32) {
+    function domainSeparator() external pure override returns (bytes32) {
         return keccak256("MockDomainSeparator");
     }
 
-    function setPreSignature(bytes calldata, bool) external pure {}
+    function setPreSignature(bytes calldata, bool) external pure override {}
 
     function settle(address[] calldata, uint256[] calldata, Trade[] calldata, Interaction[][3] calldata)
         external
         view
         override
     {
-        require(shouldSucceed, "MockICowSettlement: settle failed");
+        require(shouldSucceed, "MockCowSettlement: settle failed");
     }
 
     function setSuccessfulSettle(bool success) external {
@@ -55,7 +55,7 @@ contract MockCowSettlement is ICowSettlement {
 }
 
 contract MockWrapper is CowWrapper {
-    string public constant name = "Mock Wrapper";
+    string public override name = "Mock Wrapper";
     uint256 public consumeBytes;
 
     constructor(ICowSettlement settlement_, uint256 consumeBytes_) CowWrapper(settlement_) {