Add verbose output to vmservice tests

tests/standalone/vmservice/test_helper.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.
 
 library vmservice_test_helper;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:json' as JSON;
 import 'dart:utf' as UTF;
 import 'package:expect/expect.dart';
 
 abstract class VmServiceRequestHelper {
   final Uri uri;
   final HttpClient client;
 
   VmServiceRequestHelper(String url) :
       uri = Uri.parse(url),
       client = new HttpClient();
 
   Future makeRequest() {
     return client.getUrl(uri)
       .then((HttpClientRequest request) => request.close())
       .then((HttpClientResponse response) {
         return response
             .fold(new BytesBuilder(), (b, d) => b..add(d))
             .then((builder) {
+              print('** GET: $uri');
               _requestCompleted(builder.takeBytes(), response);
             });
       }).catchError((error) {
         onRequestFailed(error);
       });
   }
 
   void _requestCompleted(List<int> data, HttpClientResponse response) {
     Expect.equals(200, response.statusCode, 'Invalid HTTP Status Code');
     var replyAsString;
     try {
       replyAsString = UTF.decodeUtf8(data, 0, null, null);
     } catch (e) {
       onRequestFailed(e);
       return;
     }
+    print('** Response: $replyAsString');
     var reply;
     try {
       reply = JSON.parse(replyAsString);
     } catch (e) {
       onRequestFailed(e);
       return;
     }
     if (reply is! Map) {
       onRequestFailed('Reply was not a map: $reply');
       return;
@@ skipping 24 matching lines @@
 
   String get scriptPath {
     var dartScript = Platform.script;
     var splitPoint = dartScript.lastIndexOf(Platform.pathSeparator);
     var scriptDirectory = dartScript.substring(0, splitPoint);
     return scriptDirectory + Platform.pathSeparator + script;
   }
 
   Future<int> launch() {
     String dartExecutable = Platform.executable;
+    print('** Launching $scriptPath');
     return Process.start(dartExecutable,
                          ['--enable-vm-service:0', scriptPath]).then((p) {
 
       Completer completer = new Completer();
       process = p;
       var portNumber;
       var blank;
       var first = true;
       process.stdout.transform(new StringDecoder())
                     .transform(new LineTransformer()).listen((line) {
         if (line.startsWith('VmService listening on port ')) {
           RegExp portExp = new RegExp(r"\d+");
           var port = portExp.stringMatch(line);
           portNumber = int.parse(port);
         }
         if (line == '') {
           // Received blank line.
           blank = true;
         }
         if (portNumber != null && blank == true && first == true) {
           completer.complete(portNumber);
           // Stop repeat completions.
           first = false;
+          print('** Signaled to run test queries on $portNumber');
         }
         print(line);
       });
       process.stderr.transform(new StringDecoder())
                     .transform(new LineTransformer()).listen((line) {
         print(line);
       });
       process.exitCode.then((code) {
         Expect.equals(0, code, 'Launched dart executable exited with error.');
       });
       return completer.future;
     });
   }
 
   void requestExit() {
+    print('** Requesting script to exit.');
     process.stdin.add([32, 13, 10]);
   }
 }
 
 class IsolateListTester {
   final Map isolateList;
 
   IsolateListTester(this.isolateList) {
     // The reply is an IsolateList.
     Expect.equals('IsolateList', isolateList['type'], 'Not an IsolateList.');
@@ skipping 32 matching lines @@
       if (isolate['id'] == id) {
         exists = true;
         Expect.isTrue(isolate['name'].startsWith(name),
                       'Isolate $id does not have name prefix: $name'
                       ' (was ${isolate['name']})');
       }
     });
     Expect.isTrue(exists, 'No isolate with id: $id');
   }
 }