feat: capped minter v2 metadata uri

l2-contracts/src/ZkCappedMinterV2.sol

@@ -31,6 +31,12 @@ contract ZkCappedMinterV2 is AccessControl, Pausable {
   /// @notice The timestamp after which minting is no longer allowed (inclusive).
   uint48 public immutable EXPIRATION_TIME;
 
+  /// @notice The metadata URI for this minter.
+  bytes32 public metadataURI;
+
+  /// @notice Emitted when the metadata URI is set.
+  event MetadataURISet(bytes32 uri);
+
   /// @notice Error for when the cap is exceeded.
   error ZkCappedMinterV2__CapExceeded(address minter, uint256 amount);
 
@@ -122,4 +128,13 @@ contract ZkCappedMinterV2 is AccessControl, Pausable {
     _checkRole(DEFAULT_ADMIN_ROLE, msg.sender);
     closed = true;
   }
+
+  /// @notice Sets the metadata URI for this contract
+  /// @param _uri The new metadata URI
+  /// @dev Only callable by addresses with the DEFAULT_ADMIN_ROLE
+  function setMetadataURI(bytes32 _uri) external {
+    _checkRole(DEFAULT_ADMIN_ROLE, msg.sender);
+    metadataURI = _uri;
+    emit MetadataURISet(_uri);
+  }
 }

l2-contracts/test/ZkCappedMinterV2.t.sol

@@ -126,9 +126,7 @@ contract Mint is ZkCappedMinterV2Test {
     address _receiver1,
     address _receiver2,
     uint256 _amount1,
-    uint256 _amount2,
-    uint256 _startTime,
-    uint256 _expirationTime
+    uint256 _amount2
   ) public {
     _amount1 = bound(_amount1, 1, DEFAULT_CAP / 2);
     _amount2 = bound(_amount2, 1, DEFAULT_CAP / 2);
@@ -337,3 +335,36 @@ contract Close is ZkCappedMinterV2Test {
     cappedMinter.close();
   }
 }
+
+contract SetMetadataURI is ZkCappedMinterV2Test {
+  function testFuzz_InitialMetadataURIIsEmpty(address _admin, uint256 _cap, uint48 _startTime, uint48 _expirationTime)
+    public
+  {
+    (_startTime, _expirationTime) = _boundToValidTimeControls(_startTime, _expirationTime);
+
+    ZkCappedMinterV2 cappedMinter = _createCappedMinter(_admin, _cap, _startTime, _expirationTime);
+    assertEq(cappedMinter.metadataURI(), bytes32(0));
+  }
+
+  function testFuzz_AdminCanSetMetadataURI(bytes32 _uri) public {
+    vm.prank(cappedMinterAdmin);
+    cappedMinter.setMetadataURI(_uri);
+
+    assertEq(cappedMinter.metadataURI(), _uri);
+  }
+
+  function testFuzz_EmitsMetadataURISetEvent(bytes32 _uri) public {
+    vm.prank(cappedMinterAdmin);
+    vm.expectEmit();
+    emit ZkCappedMinterV2.MetadataURISet(_uri);
+    cappedMinter.setMetadataURI(_uri);
+  }
+
+  function testFuzz_RevertIf_NonAdminSetsMetadataURI(address _nonAdmin, bytes32 _uri) public {
+    vm.assume(cappedMinterAdmin != _nonAdmin);
+
+    vm.prank(_nonAdmin);
+    vm.expectRevert(_formatAccessControlError(_nonAdmin, DEFAULT_ADMIN_ROLE));
+    cappedMinter.setMetadataURI(_uri);
+  }
+}