sdk/tests/lib/async/catch_errors24_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 'dart:async';

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

import 'catch_errors.dart';

main() {
  asyncStart();
  Completer done = new Completer();

  var events = [];
  late StreamController controller;
  late Stream stream;
  // Test that the first listen on a `asBroadcastStream` determines the
  // zone the subscription lives in. In this case the outer listen happens first
  // and the error reaches `handleError`.
  catchErrors(() {
    catchErrors(() {
          controller = new StreamController();

          // Assign to the "global" `stream`.
          stream = controller.stream
              .map((x) {
                events.add("map $x");
                return x + 100;
              })
              .transform(
                new StreamTransformer.fromHandlers(
                  handleError: (e, st, sink) {
                    sink.add("error $e");
                  },
                ),
              )
              .asBroadcastStream();

          // Listen to the `stream` in the inner zone (but wait in a microtask).
          scheduleMicrotask(() {
            stream.listen((x) {
              events.add("stream $x");
              if (x == "error 2") done.complete(true);
            });
          });
        })
        .listen((x) {
          events.add(x);
        })
        .asFuture()
        .then((_) {
          Expect.fail("Unexpected callback");
        });

    // Listen to `stream` from the outer zone.
    stream.listen((x) {
      events.add("stream2 $x");
    });

    // Feed the controller, but wait in a microtask.
    scheduleMicrotask(() {
      controller.add(1);
      controller.addError(2);
      controller.close();
    });
  }).listen(
    (x) {
      events.add("outer: $x");
    },
    onDone: () {
      Expect.fail("Unexpected callback");
    },
  );

  done.future.whenComplete(() {
    // Give handlers time to complete.
    Timer.run(() {
      Expect.listEquals([
        "map 1",
        "stream2 101",
        "stream 101",
        "stream2 error 2",
        "stream error 2",
      ], events);
      asyncEnd();
    });
  });
}