tests/lib/async/zone_run_guarded_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';

main() {
  Completer done = new Completer();
  List events = [];

  // runGuarded calls run, captures the synchronous error (if any) and
  // gives that one to handleUncaughtError.

  var result;

  Expect.identical(Zone.root, Zone.current);
  late Zone forked;
  forked = Zone.current.fork(
    specification: new ZoneSpecification(
      run: <R>(Zone self, ZoneDelegate parent, Zone origin, R f()) {
        // The zone is still the same as when origin.run was invoked, which
        // is the root zone. (The origin zone hasn't been set yet).
        Expect.identical(Zone.root, Zone.current);
        events.add("forked.run");
        return parent.run(origin, f);
      },
      handleUncaughtError:
          (Zone self, ZoneDelegate parent, Zone origin, error, stackTrace) {
            Expect.identical(Zone.root, Zone.current);
            Expect.identical(forked, origin);
            events.add("forked.handleUncaught $error");
            result = 499;
          },
    ),
  );

  forked.runGuarded(() {
    events.add("runGuarded 1");
    Expect.identical(forked, Zone.current);
    result = 42;
  });
  Expect.identical(Zone.root, Zone.current);
  Expect.equals(42, result);
  events.add("after runGuarded 1");

  result = null;
  forked.runGuarded(() {
    events.add("runGuarded 2");
    Expect.identical(forked, Zone.current);
    throw 42;
  });
  Expect.equals(499, result);

  Expect.listEquals([
    "forked.run",
    "runGuarded 1",
    "after runGuarded 1",
    "forked.run",
    "runGuarded 2",
    "forked.handleUncaught 42",
  ], events);

  result = null;
  events.clear();
  asyncStart();
  forked.runGuarded(() {
    Expect.identical(forked, Zone.current);
    events.add("run closure");
    forked.scheduleMicrotask(() {
      events.add("run closure 2");
      Expect.identical(forked, Zone.current);
      done.complete(true);
      throw 88;
    });
    throw 1234;
  });
  events.add("after nested scheduleMicrotask");
  Expect.equals(499, result);

  done.future.whenComplete(() {
    Expect.listEquals([
      "forked.run",
      "run closure",
      "forked.handleUncaught 1234",
      "after nested scheduleMicrotask",
      "forked.run",
      "run closure 2",
      "forked.handleUncaught 88",
    ], events);
    asyncEnd();
  });
}