test262/test/language/expressions/class/private-static-setter-multiple-evaluations-of-class-function-ctor.js

// Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Every new evaluation of a class creates a different Private Name (private static setter)
esid: sec-runtime-semantics-evaluate-name
info: |
  ClassTail : ClassHeritage { ClassBody }
    ...
    19. Let F be constructorInfo.[[Closure]].
    20. If ClassHeritage_opt is present and protoParent is not null, then set F.[[ConstructorKind]] to "derived".
    21. Perform MakeConstructor(F, false, proto).
    22. Perform MakeClassConstructor(F).
    ...
    33. If PrivateBoundIdentifiers of ClassBody contains a Private Name P such that P's [[Kind]] field is either "method" or "accessor" and P's [[Brand]] is F,
      a. PrivateBrandAdd(F, F).
    ...

  PrivateBrandCheck(O, P)
    1. If O.[[PrivateBrands]] does not contain an entry e such that SameValue(e, P.[[Brand]]) is true,
      a. Throw a TypeError exception.
features: [class, class-static-methods-private]
---*/

let classStringExpression = `
return class {
  static set #m(v) {
    this._v = v;
  }

  static access() {
    this.#m = 'test262';
  }
}
`;

let createClass = function () {
  let classFactoryFunction = new Function(classStringExpression);
  return classFactoryFunction();
};

let C1 = createClass();
let C2 = createClass();

C1.access();
assert.sameValue(C1._v, 'test262');
C2.access();
assert.sameValue(C2._v, 'test262');

assert.throws(TypeError, function() {
  C1.access.call(C2);
}, 'invalid access of C1 private static setter');

assert.throws(TypeError, function() {
  C2.access.call(C1);
}, 'invalid access of C2 private static setter');