const shouldBehaveLikeProxy = require('../Proxy.behaviour'); const ERC1967Proxy = artifacts.require('ERC1967Proxy'); contract('ERC1967Proxy', function (accounts) { // `undefined`, `null` and other false-ish opts will not be forwarded. const createProxy = async function (implementation, initData, opts) { return ERC1967Proxy.new(implementation, initData, ...[opts].filter(Boolean)); }; shouldBehaveLikeProxy(createProxy, accounts); });