Format all tests.

tests/standalone/io/network_interface_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 testListLoopback() {
   NetworkInterface.list(includeLoopback: false).then((list) {
     for (var i in list) {
       for (var a in i.addresses) {
         Expect.isFalse(a.isLoopback);
       }
     }
   });
 
   NetworkInterface.list(includeLoopback: true).then((list) {
     Expect.isTrue(list.any((i) => i.addresses.any((a) => a.isLoopback)));
   });
 }
 
-
 void testListLinkLocal() {
   NetworkInterface.list(includeLinkLocal: false).then((list) {
     for (var i in list) {
       for (var a in i.addresses) {
         Expect.isFalse(a.isLinkLocal);
       }
     }
   });
 }
 
-
 void testListIndex() {
   var set = new Set();
   NetworkInterface.list(includeLoopback: true).then((list) {
     for (var i in list) {
       Expect.isNotNull(i.index);
       Expect.isFalse(set.contains(i.index));
       set.add(i.index);
       Expect.isTrue(set.contains(i.index));
     }
   });
 }
 
-
 void main() {
   if (!NetworkInterface.listSupported) {
     return;
   }
   testListLoopback();
   testListLinkLocal();
   testListIndex();
 }