testing/dart/isolate_test.dart

// Copyright 2013 The Flutter Authors. 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:isolate';
import 'dart:ui';

import 'package:test/test.dart';

void main() {
  test('Invalid isolate URI', () async {
    bool threw = false;
    try {
      await Isolate.spawnUri(
        Uri.parse('http://127.0.0.1/foo.dart'),
        <String>[],
        null,
      );
    } on IsolateSpawnException {
      threw = true;
    }
    expect(threw, true);
  });

  test('UI isolate API throws in a background isolate', () async {
    void callUiApi(void message) {
      PlatformDispatcher.instance.onReportTimings = (_) {};
    }
    final ReceivePort errorPort = ReceivePort();
    await Isolate.spawn<void>(callUiApi, null, onError: errorPort.sendPort);
    final List<dynamic> isolateError = await errorPort.first as List<dynamic>;
    expect(isolateError[0], 'UI actions are only available on root isolate.');
  });
}