tests/lib/async/stack_trace18_test.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.

import 'package:expect/async_helper.dart';
import 'package:expect/expect.dart';
import 'dart:async';

StackTrace captureStackTrace() {
  try {
    throw 0;
  } catch (e, st) {
    return st;
  }
}

main() {
  Completer completer = new Completer();
  StackTrace trace = captureStackTrace();
  asyncStart();
  completer.future
      .whenComplete(() => 499)
      .then<Null>((_) {
        throw "should never be reached";
      })
      .then<Null>(
        (_) {
          throw "Unreachable";
        },
        onError: (e, st) {
          Expect.equals("c-error", e);
          Expect.identical(trace, st);
          // Test the rethrowing the same error keeps the stack trace.
          throw e;
        },
      )
      .then<Null>(
        (_) {
          throw "Unreachable";
        },
        onError: (e, st) {
          Expect.equals("c-error", e);
          Expect.identical(trace, st);
          asyncEnd();
        },
      );
  completer.completeError("c-error", trace);
}