Language/Classes/Superclasses/Inheritance_and_Overriding/inheritance_t07.dart

// Copyright (c) 2019, 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 Let C be a class, let A be a superclass of C, and let S1...Sk
/// be superclasses of C that are also subclasses of A. C inherits all
/// accessible instance members of A that have not been overridden by a
/// declaration in C or in at least one of S1...Sk.
/// A class may override instance members that would otherwise have been
/// inherited from its superclass.
/// @description Checks that a subclass inherits the instance members of its
/// superclass(es). Test type aliases
/// @author sgrekhov@unipro.ru

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

class A {
  int val = 0;
}

typedef AAlias = A;

class B extends AAlias {
  foo() {
    ++val;
  }
}

class C extends B {}

main() {
  C c = new C();
  c.val = 5;
  Expect.equals(5, c.val);
  c.foo();
  Expect.equals(6, c.val);
}