553     function(err, ips, family) {  argument
556       validateResult(ips);
567     .then(function(ips) {  argument
568       assert.ok(Array.isArray(ips));
569       assert.ok(ips.length > 0);
570       assert.strictEqual(ips[0].address, '127.0.0.1');
571       assert.strictEqual(ips[0].family, 4);
594   const req = dns.lookup(null, { all: true }, (err, ips) => {
596     assert.ok(Array.isArray(ips));
597     assert.strictEqual(ips.length, 0);
625   }, function(err, ips) {  argument
627     validateResult(ips);