Async-step, first cut.

runtime/observatory/tests/service/break_on_function_test.dart

 // Copyright (c) 2015, 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  --verbose_debug
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'dart:developer';
 
@@ skipping 22 matching lines @@
   var function = rootLib.functions.singleWhere((f) => f.name == 'testFunction');
 
   var bpt = await isolate.addBreakpointAtEntry(function);
   expect(bpt is Breakpoint, isTrue);
   print(bpt);
 },
 
 resumeIsolate,
 
 hasStoppedAtBreakpoint,
-
-// We are at the breakpoint on line 11.
-(Isolate isolate) async {
-  ServiceMap stack = await isolate.getStack();
-  expect(stack.type, equals('Stack'));
-  expect(stack['frames'].length, greaterThanOrEqualTo(1));
-
-  Script script = stack['frames'][0].location.script;
-  expect(stack['frames'][0].location.tokenPos, equals(22));
-},
-
+stoppedAtLine(11),
 resumeIsolate,
 
 hasStoppedAtBreakpoint,
-
-// We are at the breakpoint on line 11.
-(Isolate isolate) async {
-  ServiceMap stack = await isolate.getStack();
-  expect(stack.type, equals('Stack'));
-  expect(stack['frames'].length, greaterThanOrEqualTo(1));
-
-  Script script = stack['frames'][0].location.script;
-  expect(stack['frames'][0].location.tokenPos, equals(22));
-},
-
+stoppedAtLine(11),
 resumeIsolate,
 
 ];
 
 main(args) => runIsolateTests(args, tests, testeeConcurrent: testMain);