tests/standalone/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.

import "dart:io";
import "package:unittest/unittest.dart";

test(int milliseconds) {
  var watch = new Stopwatch();
  watch.start();
  sleep(new Duration(milliseconds: milliseconds));
  watch.stop();
  expect(watch.elapsedMilliseconds, greaterThanOrEqualTo(milliseconds));
}

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