Add support for the node net module.

frog/tests/frog/src/NodeDnsTest.dart

Index: frog/tests/frog/src/NodeDnsTest.dart
===================================================================
--- frog/tests/frog/src/NodeDnsTest.dart	(revision 0)
+++ frog/tests/frog/src/NodeDnsTest.dart	(revision 0)
@@ -0,0 +1,104 @@
+// Copyright (c) 2011, 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.
+
+#library('NodeBufferTest');
+
+#import('unittest_node.dart');
+#import('../../../lib/node/node.dart');
+#import('../../../lib/node/dns.dart');
+
+void lookupCallback(Error err, String address, int family) {
+  if (err != null) {
+    console.log('error:');
+    console.dir(err);
+  } else {
+    console.log('family: $family address: $address');
+  }
+  callbackDone();
+}
+
+void resolveCallback(Error err, List addresses) {
+  if (err != null) {
+    console.log('error:');
+    console.dir(err);
+  } else {
+    console.log('[');
+    for (var address in addresses) {
+      console.log(address);
+    }
+    console.log(']');
+  }
+  callbackDone();
+}
+
+void stringCallback(Error err, List<String> addresses) {
+  if (err != null) {
+    console.log('error:');
+    console.dir(err);
+  } else {
+    console.log('[');
+    for (var address in addresses) {
+      console.log(address);
+    }
+    console.log(']');
+  }
+  callbackDone();
+}
+
+void mapStringCallback(Error err, List<Map<String,String>> addresses) {
+  if (err != null) {
+    console.log('error:');
+    console.dir(err);
+  } else {
+    console.log('[');
+    for (var map in addresses) {
+      for (var key in map.getKeys()) {
+        console.log('$key: ${map[key]}');
+      }
+    }
+    console.log(']');
+  }
+  callbackDone();
+}
+
+void mapObjectCallback(Error err, List<Map<String,String>> addresses) {
+  if (err != null) {
+    console.log('error:');
+    console.dir(err);
+  } else {
+    console.log('[');
+    for (var map in addresses) {
+      for (var key in map.getKeys()) {
+        console.log('$key: ${map[key]}');
+      }
+    }
+    console.log(']');
+  }
+  callbackDone();
+}
+
+void main() {
+  group('Node DNS', () {
+      asyncTest('lookup', 1, () =>
+          dns.lookup('google.com', null, lookupCallback));
+      asyncTest('resolve', 1, () =>
+          dns.resolve('google.com', 'A', resolveCallback));
+      asyncTest('resolve4', 1, () =>
+          dns.resolve4('google.com', stringCallback));
+      asyncTest('resolve6', 1, () =>
+          dns.resolve6('google.com', stringCallback));
+      asyncTest('resolveMx', 1, () =>
+          dns.resolveMx('google.com', mapStringCallback));
+      asyncTest('resolveTxt', 1, () =>
+          dns.resolveTxt('google.com', stringCallback));
+      asyncTest('resolveSrv', 1, () =>
+          dns.resolveSrv('google.com', mapObjectCallback));
+      asyncTest('reverse', 1, () =>
+          dns.reverse("127.0.0.1", stringCallback));
+      asyncTest('resolveNs', 1, () =>
+          dns.resolveNs('google.com', stringCallback));
+      asyncTest('resolveCname', 1, () =>
+          dns.resolveCname('google.com', stringCallback));
+      });
+}