pragma solidity ^0.4.24; import "../access/Roles.sol"; contract RolesMock { using Roles for Roles.Role; Roles.Role private dummyRole; function add(address _account) public { dummyRole.add(_account); } function remove(address _account) public { dummyRole.remove(_account); } function has(address _account) public view returns (bool) { return dummyRole.has(_account); } }