1'use strict'; 2const common = require('../common'); 3const assert = require('assert'); 4 5const { Resolver } = require('dns'); 6 7const resolver = new Resolver(); 8assert(resolver.getServers().length > 0); 9// return undefined 10resolver._handle.getServers = common.mustCall(); 11assert.strictEqual(resolver.getServers().length, 0); 12