Language/Types/Interface_Types/interface_supertypes_t02.dart

// 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 S is a supertype of T , written S :> T , iff T is a subtype of S.
/// @description Trivially checks that an interface extending some other
/// interface extends its superinterfaces as well.
/// @author iefremov

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

class I0 {}

class I1 implements I0 {}

class I2 implements I1 {}

class A implements I2 {}

main() {
  Expect.isTrue(new A() is I1);
  Expect.isTrue(new A() is I0);
  Expect.runtimeIsType<I1>(new A());
  Expect.runtimeIsType<I0>(new A());
}