runtime/observatory/tests/service/pause_on_unhandled_async_exceptions2_test.dart

// Copyright (c) 2017, 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=--async_debugger --lazy-async-stacks
// VMOptions=--async_debugger --lazy-async-stacks --optimization-counter-threshold=5

import 'package:observatory/service_io.dart';
import 'package:observatory/models.dart' as M;
import 'package:test/test.dart';
import 'test_helper.dart';
import 'service_test_common.dart';

const LINE_A = 36;

class Foo {}

doThrow() {
  throw "TheException";
  return "end of doThrow";
}

asyncThrower() async {
  await 0; // force async gap
  doThrow();
}

testeeMain() async {
  // Trigger optimization via OSR.
  var s = 0;
  for (var i = 0; i < 100; i++) {
    s += i;
  }
  print(s);
  // No try ... catch.
  await asyncThrower(); // LINE_A
}

var tests = <IsolateTest>[
  hasStoppedWithUnhandledException,
  (Isolate isolate) async {
    print("We stopped!");
    var stack = await isolate.getStack();
    expect(stack['asyncCausalFrames'], isNotNull);
    var asyncStack = stack['asyncCausalFrames'];
    expect(asyncStack.length, greaterThanOrEqualTo(4));
    expect(asyncStack[0].toString(), contains('doThrow'));
    expect(asyncStack[1].toString(), contains('asyncThrower'));
    expect(asyncStack[2].kind, equals(M.FrameKind.asyncSuspensionMarker));
    expect(asyncStack[3].toString(), contains('testeeMain'));
    expect(
        await asyncStack[3].location.toUserString(), contains('.dart:$LINE_A'));
  }
];

main(args) => runIsolateTests(
      args,
      tests,
      pause_on_unhandled_exceptions: true,
      testeeConcurrent: testeeMain,
      extraArgs: extraDebuggingArgs,
      // TODO(bkonyi): causes ASSERT in debug mode, unrelated to DDS.
      // See https://github.com/dart-lang/sdk/issues/41379.
      enableDds: false,
    );