rln-contract/test/Verifier.sol

// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.15;

import {IVerifier} from "../contracts/IVerifier.sol";

contract TrueVerifier is IVerifier {
    function verifyProof(uint256[2] memory a, uint256[2][2] memory b, uint256[2] memory c, uint256[2] memory input)
        external
        pure
        returns (bool)
    {
        return true;
    }
}

contract FalseVerifier is IVerifier {
    function verifyProof(uint256[2] memory a, uint256[2][2] memory b, uint256[2] memory c, uint256[2] memory input)
        external
        pure
        returns (bool)
    {
        return false;
    }
}