tests/lib/async/stack_trace19_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();
  late StackTrace whenCompleteStackTrace;
  asyncStart();
  completer.future
      .whenComplete(() {
        throw "other_error";
      })
      .then<Null>((_) {
        throw "should never be reached";
      })
      .catchError((e, st) {
        Expect.equals("other_error", e);
        Expect.isNotNull(st);
        Expect.isFalse(identical(trace, st));
        whenCompleteStackTrace = st;
        // Test the rethrowing the same error keeps the stack trace.
        throw e;
      })
      .catchError((e, st) {
        Expect.equals("other_error", e);
        Expect.identical(whenCompleteStackTrace, st);
        asyncEnd();
      });
  completer.completeError("c-error", trace);
}