runtime/observatory/tests/service/awaiter_async_stack_contents_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 --verbose-debug --no-causal-async-stacks --lazy-async-stacks
// VMOptions=--async-debugger --verbose-debug --causal-async-stacks --no-lazy-async-stacks

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

const LINE_C = 22;
const LINE_A = 28;
const LINE_B = 34;
const LINE_D = 29;

foobar() async {
  await null;
  debugger();
  print('foobar'); // LINE_C.
}

helper() async {
  await null;
  debugger();
  print('helper'); // LINE_A.
  await foobar(); // LINE_D
}

testMain() {
  debugger();
  helper(); // LINE_B.
}

var tests = <IsolateTest>[
  hasStoppedAtBreakpoint,
  stoppedAtLine(LINE_B),
  (Isolate isolate) async {
    ServiceMap stack = await isolate.getStack();
    // No awaiter frames because we are in a completely synchronous stack.
    expect(stack['awaiterFrames'], isNull);
  },
  resumeIsolate,
  hasStoppedAtBreakpoint,
  stoppedAtLine(LINE_A),
  resumeIsolate,
  hasStoppedAtBreakpoint,
  stoppedAtLine(LINE_C),
  (Isolate isolate) async {
    // Verify awaiter stack trace is the current frame + the awaiter.
    ServiceMap stack = await isolate.getStack();
    expect(stack['awaiterFrames'], isNotNull);
    List awaiterFrames = stack['awaiterFrames'];
    if (useCausalAsyncStacks) {
      expect(awaiterFrames.length, greaterThanOrEqualTo(4));
      // Awaiter frame.
      expect(await awaiterFrames[0].toUserString(),
          stringContainsInOrder(['foobar', '.dart:$LINE_C']));
      // Awaiter frame.
      expect(await awaiterFrames[1].toUserString(),
          stringContainsInOrder(['helper', '.dart:$LINE_D']));
      // Suspension point.
      expect(awaiterFrames[2].kind, equals(M.FrameKind.asyncSuspensionMarker));
      // Causal frame.
      expect(await awaiterFrames[3].toUserString(),
          stringContainsInOrder(['testMain', '.dart:$LINE_B']));
    } else {
      expect(awaiterFrames.length, greaterThanOrEqualTo(2));
      // Awaiter frame.
      expect(await awaiterFrames[0].toUserString(),
          stringContainsInOrder(['foobar', '.dart:$LINE_C']));
      // Awaiter frame.
      expect(await awaiterFrames[1].toUserString(),
          stringContainsInOrder(['helper', '.dart:$LINE_D']));
      // "helper" is not await'ed.
    }
  },
];

main(args) => runIsolateTestsSynchronous(args, tests,
    testeeConcurrent: testMain, extraArgs: extraDebuggingArgs);