Improve resource record implementation in the mdns package.

pkg/mdns/test/lookup_resolver_test.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 import 'dart:io';
 
 import 'package:expect/expect.dart';
+import 'package:mdns/src/constants.dart' show RRType;
+import 'package:mdns/src/lookup_resolver.dart';
 import 'package:mdns/src/packet.dart';
-import 'package:mdns/src/lookup_resolver.dart';
 
 main() async {
   await testTimeout();
   await testResult();
   await testResult2();
   await testResult3();
 }
 
+ResourceRecord ip4Result(String name, InternetAddress address) {
+  int validUntil = new DateTime.now().millisecondsSinceEpoch + 2000;
+  return new ResourceRecord(RRType.A, name, address, validUntil);
+}
+
 testTimeout() async {
   var shortTimeout = new Duration(milliseconds: 1);
   var resolver = new LookupResolver();
-  var result = await resolver.addPendingRequest('xxx', shortTimeout);
-  Expect.isNull(result);
+  var result = resolver.addPendingRequest(RRType.A, 'xxx', shortTimeout);
+  Expect.isTrue(await result.isEmpty);
 }
 
 // One pending request and one response.
 testResult() async {
   var noTimeout = new Duration(days: 1);
   var resolver = new LookupResolver();
-  var futureResult = resolver.addPendingRequest('xxx', noTimeout);
-  var response = new DecodeResult('xxx', new InternetAddress('1.2.3.4'));
+  var futureResult = resolver.addPendingRequest(RRType.A, 'xxx', noTimeout);
+  var response = ip4Result('xxx', new InternetAddress('1.2.3.4'));
   resolver.handleResponse([response]);
-  var result = await futureResult;
-  Expect.equals('1.2.3.4', result.address);
+  var result = await futureResult.first;
+  Expect.equals('1.2.3.4', result.address.address);
+  resolver.clearPendingRequests();
 }
 
 testResult2() async {
   var noTimeout = new Duration(days: 1);
   var resolver = new LookupResolver();
-  var futureResult1 = resolver.addPendingRequest('xxx', noTimeout);
-  var futureResult2 = resolver.addPendingRequest('yyy', noTimeout);
-  var response1 = new DecodeResult('xxx', new InternetAddress('1.2.3.4'));
-  var response2 = new DecodeResult('yyy', new InternetAddress('2.3.4.5'));
+  var futureResult1 = resolver.addPendingRequest(RRType.A, 'xxx', noTimeout);
+  var futureResult2 = resolver.addPendingRequest(RRType.A, 'yyy', noTimeout);
+  var response1 = ip4Result('xxx', new InternetAddress('1.2.3.4'));
+  var response2 = ip4Result('yyy', new InternetAddress('2.3.4.5'));
   resolver.handleResponse([response2, response1]);
-  var result1 = await futureResult1;
-  var result2 = await futureResult2;
-  Expect.equals('1.2.3.4', result1.address);
-  Expect.equals('2.3.4.5', result2.address);
+  var result1 = await futureResult1.first;
+  var result2 = await futureResult2.first;
+  Expect.equals('1.2.3.4', result1.address.address);
+  Expect.equals('2.3.4.5', result2.address.address);
+  resolver.clearPendingRequests();
 }
 
 testResult3() async {
   var noTimeout = new Duration(days: 1);
   var resolver = new LookupResolver();
-  var response0 = new DecodeResult('zzz', new InternetAddress('2.3.4.5'));
+  var response0 = ip4Result('zzz', new InternetAddress('2.3.4.5'));
   resolver.handleResponse([response0]);
-  var futureResult1 = resolver.addPendingRequest('xxx', noTimeout);
+  var futureResult1 = resolver.addPendingRequest(RRType.A, 'xxx', noTimeout);
   resolver.handleResponse([response0]);
-  var futureResult2 = resolver.addPendingRequest('yyy', noTimeout);
+  var futureResult2 = resolver.addPendingRequest(RRType.A, 'yyy', noTimeout);
   resolver.handleResponse([response0]);
-  var response1 = new DecodeResult('xxx', new InternetAddress('1.2.3.4'));
+  var response1 = ip4Result('xxx', new InternetAddress('1.2.3.4'));
   resolver.handleResponse([response0]);
-  var response2 = new DecodeResult('yyy', new InternetAddress('2.3.4.5'));
+  var response2 = ip4Result('yyy', new InternetAddress('2.3.4.5'));
   resolver.handleResponse([response0]);
   resolver.handleResponse([response2, response1]);
   resolver.handleResponse([response0]);
-  var result1 = await futureResult1;
-  var result2 = await futureResult2;
-  Expect.equals('1.2.3.4', result1.address);
-  Expect.equals('2.3.4.5', result2.address);
+  var result1 = await futureResult1.first;
+  var result2 = await futureResult2.first;
+  Expect.equals('1.2.3.4', result1.address.address);
+  Expect.equals('2.3.4.5', result2.address.address);
+  resolver.clearPendingRequests();
 }