LanguageFeatures/Super-mixins/mixin_application_t11.dart

// Copyright (c) 2018, 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 Mixin application semantics is mostly unchanged, except that it's
/// a compile-time error to apply a mixin to a class that doesn't implement all
/// the 'on' type requirements of the mixin declaration, or apply a mixin
/// containing super-invocations to a class that doesn't have a concrete
/// implementation of the super-invoked members compatible with the
/// super-constraint interface.
///
/// @description Checks that there is no compile error if a mixin is applied to a
/// class that implements all the 'on' type requirements of the mixin
/// declaration. Test 'mixin' implementation of 'on' clause interfaces
/// @author sgrekhov@unipro.ru

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

class S {}
class T {}
class X extends S {}
class Y extends T {}

String console = "";

class A<T> {
  String get a1 => "A.a1";
  set a2(String v) {
    console = "A:$v";
  }

  String a3() => "A.a3";
  String operator +(A v) => a1.substring(0, 1);
}

abstract class B<T> {
  String get b1;
  void set b2(String v);
  String b3();
  String operator -(B v);
}

class C<X, Y> extends B<Y> with A<X> {
  String get b1 => "C.b1";
  set b2(String v) {
    console = "C:$v";
  }

  String b3() => "C.b3";
  String operator -(B v) => b1.substring(0, 3);
}

mixin M<X extends S, Y extends T> on A<X>, B<Y> {
  String get m1 => "m1";
  void set m2(String v) {
    console = "M:$v";
  }

  String m3() => "m3";
}

class MA extends C<X, Y> with M<X, Y> {
}

main() {
  MA ma = new MA();

  Expect.equals("A.a1", ma.a1);
  ma.a2 = "a2";
  Expect.equals("A:a2", console);
  Expect.equals("A.a3", ma.a3());
  Expect.equals("A", ma + ma);

  Expect.equals("C.b1", ma.b1);
  ma.b2 = "b2";
  Expect.equals("C:b2", console);
  Expect.equals("C.b3", ma.b3());
  Expect.equals("C.b", ma - ma);

  Expect.equals("m1", ma.m1);
  ma.m2 = "m2";
  Expect.equals("M:m2", console);
  Expect.equals("m3", ma.m3());
}