Fix SecureSocket tests to look up localhost only once, where possible.

tests/standalone/io/raw_secure_server_socket_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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "dart:async";
 import "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
-import "package:path/path.dart";
 
-const HOST_NAME = "localhost";
+InternetAddress HOST;
 const CERTIFICATE = "localhost_cert";
 
 void testSimpleBind() {
   asyncStart();
-  RawSecureServerSocket.bind(HOST_NAME, 0, CERTIFICATE).then((s) {
+  RawSecureServerSocket.bind(HOST, 0, CERTIFICATE).then((s) {
     Expect.isTrue(s.port > 0);
     s.close();
     asyncEnd();
   });
 }
 
 void testInvalidBind() {
   int count = 0;
 
   // Bind to a unknown DNS name.
   asyncStart();
   RawSecureServerSocket.bind("ko.faar.__hest__", 0, CERTIFICATE).then((_) {
     Expect.fail("Failure expected");
   }).catchError((error) {
     Expect.isTrue(error is SocketException);
     asyncEnd();
   });
 
   // Bind to an unavaliable IP-address.
   asyncStart();
   RawSecureServerSocket.bind("8.8.8.8", 0, CERTIFICATE).then((_) {
     Expect.fail("Failure expected");
   }).catchError((error) {
     Expect.isTrue(error is SocketException);
     asyncEnd();
   });
 
   // Bind to a port already in use.
   asyncStart();
-  RawSecureServerSocket.bind(HOST_NAME, 0, CERTIFICATE).then((s) {
-    RawSecureServerSocket.bind(HOST_NAME,
+  RawSecureServerSocket.bind(HOST, 0, CERTIFICATE).then((s) {
+    RawSecureServerSocket.bind(HOST,
                                s.port,
                                CERTIFICATE).then((t) {
       s.close();
       t.close();
       Expect.fail("Multiple listens on same port");
     })
     .catchError((error) {
       Expect.isTrue(error is SocketException);
       s.close();
       asyncEnd();
     });
   });
 }
 
 void testSimpleConnect(String certificate) {
   asyncStart();
-  RawSecureServerSocket.bind(HOST_NAME, 0, certificate).then((server) {
-    var clientEndFuture = RawSecureSocket.connect(HOST_NAME, server.port);
+  RawSecureServerSocket.bind(HOST, 0, certificate).then((server) {
+    var clientEndFuture = RawSecureSocket.connect(HOST, server.port);
     server.listen((serverEnd) {
       clientEndFuture.then((clientEnd) {
         clientEnd.shutdown(SocketDirection.SEND);
         serverEnd.shutdown(SocketDirection.SEND);
         server.close();
         asyncEnd();
       });
     });
   });
 }
 
 void testSimpleConnectFail(String certificate, bool cancelOnError) {
   asyncStart();
-  RawSecureServerSocket.bind(HOST_NAME, 0, certificate).then((server) {
-    var clientEndFuture = RawSecureSocket.connect(HOST_NAME, server.port)
+  RawSecureServerSocket.bind(HOST, 0, certificate).then((server) {
+    var clientEndFuture = RawSecureSocket.connect(HOST, server.port)
       .then((clientEnd) {
         Expect.fail("No client connection expected.");
       })
       .catchError((error) {
         Expect.isTrue(error is SocketException ||
                       error is HandshakeException);
       });
     server.listen((serverEnd) {
       Expect.fail("No server connection expected.");
     },
     onError: (error) {
       Expect.isTrue(error is CertificateException);
       clientEndFuture.then((_) {
         if (!cancelOnError) server.close();
         asyncEnd();
       });
     },
     cancelOnError: cancelOnError);
   });
 }
 
 void testServerListenAfterConnect() {
   asyncStart();
-  RawSecureServerSocket.bind(HOST_NAME, 0, CERTIFICATE).then((server) {
+  RawSecureServerSocket.bind(HOST, 0, CERTIFICATE).then((server) {
     Expect.isTrue(server.port > 0);
-    var clientEndFuture = RawSecureSocket.connect(HOST_NAME, server.port);
+    var clientEndFuture = RawSecureSocket.connect(HOST, server.port);
     new Timer(const Duration(milliseconds: 500), () {
       server.listen((serverEnd) {
         clientEndFuture.then((clientEnd) {
           clientEnd.shutdown(SocketDirection.SEND);
           serverEnd.shutdown(SocketDirection.SEND);
           server.close();
           asyncEnd();
         });
       });
     });
@@ skipping 293 matching lines @@
           Expect.fail("Unexpected close");
           break;
         default: throw "Unexpected event $event";
       }
     });
     return completer.future;
   }
 
   Future<RawSecureSocket> connectClient(int port) {
     if (connectSecure) {
-      return RawSecureSocket.connect(HOST_NAME, port);
+      return RawSecureSocket.connect(HOST, port);
     } else if (!handshakeBeforeSecure) {
-      return RawSocket.connect(HOST_NAME, port).then((socket) {
+      return RawSocket.connect(HOST, port).then((socket) {
         return RawSecureSocket.secure(socket);
       });
     } else {
-      return RawSocket.connect(HOST_NAME, port).then((socket) {
+      return RawSocket.connect(HOST, port).then((socket) {
         return runClientHandshake(socket).then((subscription) {
             return RawSecureSocket.secure(socket, subscription: subscription);
         });
       });
     }
   }
 
   serverReady(server) {
     server.listen((client) {
       if (listenSecure) {
@@ skipping 16 matching lines @@
     });
 
     connectClient(server.port).then(runClient).then((socket) {
       socket.close();
       asyncEnd();
     });
   }
 
   if (listenSecure) {
     RawSecureServerSocket.bind(
-        HOST_NAME, 0, CERTIFICATE).then(serverReady);
+        HOST, 0, CERTIFICATE).then(serverReady);
   } else {
-    RawServerSocket.bind(HOST_NAME, 0).then(serverReady);
+    RawServerSocket.bind(HOST, 0).then(serverReady);
   }
 }
 
 testPausedSecuringSubscription(bool pausedServer, bool pausedClient) {
   bool expectFail = pausedServer || pausedClient;
 
   asyncStart();
   var clientComplete = new Completer();
-  RawServerSocket.bind(HOST_NAME, 0).then((server) {
+  RawServerSocket.bind(HOST, 0).then((server) {
     server.listen((client) {
       var subscription;
       subscription = client.listen((_) {
         if (pausedServer) {
           subscription.pause();
         }
         RawSecureSocket.secureServer(
             client, CERTIFICATE, subscription: subscription).then((client) {
           if (expectFail) {
             Expect.fail("secureServer succeeded with paused subscription");
           }
         }).catchError((e) {
           if (!expectFail) {
             Expect.fail("secureServer failed with non-paused subscriptions");
           }
           if (pausedServer) {
             Expect.isTrue(e is StateError);
           }
         }).whenComplete(() {
           server.close();
           clientComplete.future.then((_) {
             client.close();
             asyncEnd();
           });
         });
       });
     });
 
-    RawSocket.connect(HOST_NAME, server.port).then((socket) {
+    RawSocket.connect(HOST, server.port).then((socket) {
       var subscription;
       subscription = socket.listen((_) {
         if (pausedClient) {
           subscription.pause();
         }
         RawSecureSocket.secure(
             socket, subscription: subscription).then((socket) {
           if (expectFail) {
             Expect.fail("secure succeeded with paused subscription");
           }
           socket.close();
         }).catchError((e) {
           if (!expectFail) {
             Expect.fail("secure failed with non-paused subscriptions ($e)");
           }
           if (pausedClient) {
             Expect.isTrue(e is StateError);
           }
         }).whenComplete(() {
           clientComplete.complete(null);
         });
       });
     });
   });
 }
 
 main() {
+  asyncStart();
   var certificateDatabase = Platform.script.resolve('pkcert').toFilePath();
   SecureSocket.initialize(database: certificateDatabase,
                           password: 'dartdart',
                           useBuiltinRoots: false);
+  InternetAddress.lookup("localhost").then((hosts) {
+    HOST = hosts.first;
+    runTests();
+    asyncEnd();
+  });
+}
+
+runTests() {
   testSimpleBind();
   testInvalidBind();
   testSimpleConnect(CERTIFICATE);
   testSimpleConnect("CN=localhost");
   testSimpleConnectFail("not_a_nickname", false);
   testSimpleConnectFail("CN=notARealDistinguishedName", false);
   testSimpleConnectFail("not_a_nickname", true);
   testSimpleConnectFail("CN=notARealDistinguishedName", true);
   testServerListenAfterConnect();
   testSimpleReadWrite(listenSecure: true,
@@ skipping 34 matching lines @@
   testSimpleReadWrite(listenSecure: false,
                       connectSecure: false,
                       handshakeBeforeSecure: true,
                       postponeSecure: true,
                       dropReads: true);
   testPausedSecuringSubscription(false, false);
   testPausedSecuringSubscription(true, false);
   testPausedSecuringSubscription(false, true);
   testPausedSecuringSubscription(true, true);
 }