test: check for multi-localhost support

test/common.js

@@ -210,3 +210,11 @@ exports.mustCall = function(fn, expected) {
     return fn.apply(this, arguments);
   };
 };
+
+exports.hasMultiLocalhost = function hasMultiLocalhost() {
+  var TCP = process.binding('tcp_wrap').TCP;
+  var t = new TCP();
+  var ret = t.bind('127.0.0.2', exports.PORT);
+  t.close();
+  return ret === 0;
+};

test/simple/test-http-localaddress.js

@@ -23,7 +23,7 @@ var common = require('../common');
 var http = require('http'),
     assert = require('assert');
 
-if (['linux', 'win32'].indexOf(process.platform) == -1) {
+if (!common.hasMultiLocalhost()) {
   console.log('Skipping platform-specific test.');
   process.exit();
 }

test/simple/test-https-localaddress.js

@@ -24,7 +24,7 @@ var https = require('https'),
     fs = require('fs'),
     assert = require('assert');
 
-if (['linux', 'win32'].indexOf(process.platform) == -1) {
+if (!common.hasMultiLocalhost()) {
   console.log('Skipping platform-specific test.');
   process.exit();
 }