Add argument checking to InternetAddress constructor

tests/standalone/io/internet_address_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:io';
 
 import "package:expect/expect.dart";
 
+void testIllegalArguments() {
+  var args = [
+      null, 1, 1.1, new Object(), [], {'a' : '127.0.0.1'},
+      "", "." , ":", ":::"];
+  args.forEach((arg) {
+    Expect.throws(() => new InternetAddress(arg),
+                  (e) => e is ArgumentError);
+  });
+}
+
 void testDefaultAddresses() {
   var loopback4 = InternetAddress.LOOPBACK_IP_V4;
   Expect.isNotNull(loopback4);
   Expect.equals(InternetAddressType.IP_V4, loopback4.type);
   Expect.equals("127.0.0.1", loopback4.host);
   Expect.equals("127.0.0.1", loopback4.address);
 
   var loopback6 = InternetAddress.LOOPBACK_IP_V6;
   Expect.isNotNull(loopback6);
   Expect.equals(InternetAddressType.IP_V6, loopback6.type);
@@ skipping 105 matching lines @@
   InternetAddress.lookup('127.0.0.1').then((addrs) {
     Expect.equals('127.0.0.1', addrs.first.host);
     addrs.first.reverse().then((addr) {
       Expect.isNotNull(addr.host);
       Expect.notEquals('127.0.0.1', addr.host);
     });
   });
 }
 
 void main() {
+  testIllegalArguments();
   testDefaultAddresses();
   testConstructor();
   testEquality();
   testLookup();
   testReverseLookup();
 }