tests/standalone_2/io/sleep_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.

// @dart = 2.9

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

test(int milliseconds) {
  var watch = new Stopwatch();
  watch.start();
  sleep(new Duration(milliseconds: milliseconds));
  watch.stop();
  Expect.isTrue(watch.elapsedMilliseconds >= milliseconds);
}

main() {
  test(0);
  test(1);
  test(10);
  test(100);
  bool sawError = false;
  try {
    sleep(new Duration(milliseconds: -1));
    Expect.fail('Should not reach here.');
  } on ArgumentError catch (e) {
    sawError = true;
  }
  Expect.isTrue(sawError);
}