// Copyright (c) 2011, 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.

/// @assertion Duration difference(DateTime other)
/// Returns a [Duration] with the difference of [:this:] and [other]
/// @description Checks that the method returns Duration instance
/// @author hlodvig

import "../../../Utils/expect.dart";

main() {
  Expect.isTrue(new DateTime.now().difference(new DateTime.now()) is Duration);
  Expect.isTrue(new DateTime.fromMillisecondsSinceEpoch(0)
      .difference(new DateTime.fromMillisecondsSinceEpoch(1000)) is Duration);
  Expect.isTrue(new DateTime.fromMillisecondsSinceEpoch(0)
      .difference(new DateTime.fromMillisecondsSinceEpoch(-1000)) is Duration);
  Expect.isTrue(new DateTime.fromMillisecondsSinceEpoch(1000)
      .difference(new DateTime.fromMillisecondsSinceEpoch(0)) is Duration);
  Expect.isTrue(new DateTime.fromMillisecondsSinceEpoch(1000)
      .difference(new DateTime.fromMillisecondsSinceEpoch(0)) is Duration);
  Expect.isTrue(new DateTime.fromMillisecondsSinceEpoch(0)
      .difference(new DateTime.fromMillisecondsSinceEpoch(1000)) is Duration);
  Expect.runtimeIsType<Duration>(
      new DateTime.now().difference(new DateTime.now()));
  Expect.runtimeIsType<Duration>(new DateTime.fromMillisecondsSinceEpoch(0)
      .difference(new DateTime.fromMillisecondsSinceEpoch(1000)));
  Expect.runtimeIsType<Duration>(new DateTime.fromMillisecondsSinceEpoch(0)
      .difference(new DateTime.fromMillisecondsSinceEpoch(-1000)));
  Expect.runtimeIsType<Duration>(new DateTime.fromMillisecondsSinceEpoch(1000)
      .difference(new DateTime.fromMillisecondsSinceEpoch(0)));
  Expect.runtimeIsType<Duration>(new DateTime.fromMillisecondsSinceEpoch(1000)
      .difference(new DateTime.fromMillisecondsSinceEpoch(0)));
  Expect.runtimeIsType<Duration>(new DateTime.fromMillisecondsSinceEpoch(0)
      .difference(new DateTime.fromMillisecondsSinceEpoch(1000)));
}