// contracts/Implementation.sol // SPDX-License-Identifier: Apache 2 pragma solidity ^0.8.0; import "../NFTBridgeImplementation.sol"; contract MockNFTBridgeImplementation is NFTBridgeImplementation { function initialize() initializer public override { // this function needs to be exposed for an upgrade to pass } function testNewImplementationActive() external pure returns (bool) { return true; } }