'use strict'; const common = require('../common'); const assert = require('assert'); const net = require('net'); const expectedError = /^TypeError: "lookup" option should be a function$/; ['foobar', 1, {}, []].forEach((input) => connectThrows(input)); function connectThrows(input) { const opts = { host: 'localhost', port: common.PORT, lookup: input }; assert.throws(function() { net.connect(opts); }, expectedError); } connectDoesNotThrow(common.noop); function connectDoesNotThrow(input) { const opts = { host: 'localhost', port: common.PORT, lookup: input }; assert.doesNotThrow(function() { net.connect(opts); }); }