test: use reserved invalid hostname for tests

PR-URL: nodejs/node#14781
Refs: https://tools.ietf.org/html/rfc2606#section-2
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-net-better-error-messages-port-hostname.js

@@ -4,12 +4,12 @@ const net = require('net');
 const assert = require('assert');
 
 // Using port 0 as hostname used is already invalid.
-const c = net.createConnection(0, '***');
+const c = net.createConnection(0, 'this.hostname.is.invalid');
 
 c.on('connect', common.mustNotCall());
 
 c.on('error', common.mustCall(function(e) {
   assert.strictEqual(e.code, 'ENOTFOUND');
   assert.strictEqual(e.port, 0);
-  assert.strictEqual(e.hostname, '***');
+  assert.strictEqual(e.hostname, 'this.hostname.is.invalid');
 }));

test/parallel/test-net-connect-immediate-finish.js

@@ -24,14 +24,17 @@ const common = require('../common');
 const assert = require('assert');
 const net = require('net');
 
-const client = net.connect({ host: '***', port: common.PORT });
+const client = net.connect({
+  host: 'this.hostname.is.invalid',
+  port: common.PORT
+});
 
 client.once('error', common.mustCall((err) => {
   assert(err);
   assert.strictEqual(err.code, err.errno);
   assert.strictEqual(err.code, 'ENOTFOUND');
   assert.strictEqual(err.host, err.hostname);
-  assert.strictEqual(err.host, '***');
+  assert.strictEqual(err.host, 'this.hostname.is.invalid');
   assert.strictEqual(err.syscall, 'getaddrinfo');
 }));