Add hasStoppedAtBreakpoint

runtime/observatory/tests/service/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.
 // VMOptions=--compile-all --error_on_bad_type --error_on_bad_override --checked
 
 library test_helper;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 133 matching lines @@
 Future processServiceEvents(VM vm, ServiceEventHandler handler) {
   Completer completer = new Completer();
   var subscription;
   subscription = vm.events.stream.listen((ServiceEvent event) {
     handler(event, subscription, completer);
   });
   return completer.future;
 }
 
 
+Future<Isolate> hasStoppedAtBreakpoint(Isolate isolate) {
+  if ((isolate.pauseEvent != null) &&
+      (isolate.pauseEvent.eventType == ServiceEvent.kPauseBreakpoint)) {
+    // Already waiting at a breakpoint.
+    print('Breakpoint reached');
+    return new Future.value(isolate);
+  }
+
+  // Set up a listener to wait for breakpoint events.
+  Completer completer = new Completer();
+  var subscription;
+  subscription = isolate.vm.events.stream.listen((ServiceEvent event) {
+    if (event.eventType == ServiceEvent.kPauseBreakpoint) {
+      print('Breakpoint reached');
+      subscription.cancel();
+      completer.complete(isolate);
+    }
+  });
+
+  return completer.future;  // Will complete when breakpoint hit.
+}
+
 /// Runs [tests] in sequence, each of which should take an [Isolate] and
 /// return a [Future]. Code for setting up state can run before and/or
 /// concurrently with the tests. Uses [mainArgs] to determine whether
 /// to run tests or testee in this invokation of the script.
 Future runVMTests(List<String> mainArgs,
                   List<VMTest> tests,
                   {Future testeeBefore(),
                    Future testeeConcurrent(),
                    bool pause_on_exit}) async {
   if (mainArgs.contains(_TESTEE_MODE_FLAG)) {
@@ skipping 23 matching lines @@
       }, onError: (e, st) {
         process.requestExit();
         if (!_isWebSocketDisconnect(e)) {
           print('Unexpected exception in service tests: $e $st');
           throw e;
         }
       });
     });
   }
 }