runtime/observatory/tests/service/steal_breakpoint_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=--error_on_bad_type --error_on_bad_override --steal-breakpoints

import 'package:observatory/service_io.dart';
import 'package:unittest/unittest.dart';
import 'test_helper.dart';
import 'dart:async';

int counter = 0;

void periodicTask(_) {
  counter++;  // Line 14.  We set our breakpoint here.
  if (counter % 1000 == 0) {
    print('counter = $counter');
  }
}

void startTimer() {
  new Timer.periodic(const Duration(milliseconds:10), periodicTask);
}

var tests = [

// Add a breakpoint and wait for it to be reached.
(Isolate isolate) async {
  await isolate.rootLibrary.load();

  // Set up a listener to wait for breakpoint events.
  Completer completer = new Completer();
  var stream = await isolate.vm.getEventStream(VM.kDebugStream);
  var subscription;
  subscription = stream.listen((ServiceEvent event) {
    if (event.kind == ServiceEvent.kPauseBreakpoint) {
      print('Isolate paused at breakpoint');
      subscription.cancel();
      completer.complete();
    }
  });

  // Add the breakpoint.
  var script = isolate.rootLibrary.scripts[0];
  var result = await isolate.addBreakpoint(script, 14);
  expect(result is Breakpoint, isTrue);

  await completer.future;  // Wait for breakpoint event to fire.
},

// We are at the breakpoint on line 14.
(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;
  await script.load();
  expect(script.name,endsWith('steal_breakpoint_test.dart'));
  expect(script.tokenToLine(stack['frames'][0].location.tokenPos), equals(14));
},

// Resume
(Isolate isolate) async {
  Completer completer = new Completer();
  var stream = await isolate.vm.getEventStream(VM.kDebugStream);
  var subscription;
  subscription = stream.listen((ServiceEvent event) {
    if (event.kind == ServiceEvent.kResume) {
      print('Isolate resumed');
      subscription.cancel();
      completer.complete();
    }
  });
  isolate.resume();
  await completer.future;
},

];

main(args) => runIsolateTests(args, tests, testeeBefore: startTimer);