Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t02.dart

// Copyright (c) 2016, 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 A compound assignment of the form C?.v op= e2 is equivalent to
/// the expression C.v op= e2.
/// @description Checks that an expression of the of the form C?.v /= e2 is
/// equivalent to the expression C.v /= e2.
/// @author sgrekhov@unipro.ru

import '../../../../Utils/expect.dart';

class C {
  static var _v;
  static int getterInvocation = 0;
  static int setterInvocation = 0;

  static void init(val) {
    _v = val;
    getterInvocation = 0;
    setterInvocation = 0;
  }

  static get v {
    ++getterInvocation;
    return _v;
  }

  static set v(val) {
    ++setterInvocation;
    _v = val;
  }
}

main() {
  Expect.throws(() {C.v /= 2;});
  Expect.equals(1, C.getterInvocation);
  Expect.equals(0, C.setterInvocation);

  C.init(null);
  Expect.throws(() {C?.v /= 2;});
//                   ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
  Expect.equals(1, C.getterInvocation);
  Expect.equals(0, C.setterInvocation);

  C.init(6);
  var res3 = (C?.v /= 2);
//             ^^
// [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
  Expect.equals(1, C.getterInvocation);
  Expect.equals(1, C.setterInvocation);
  Expect.equals(3, res3);
  Expect.equals(3, C.v);
}