JSTests/test262/test/language/expressions/in/private-field-presence-field-shadowed.js

// Copyright 2021 the V8 project authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Value when private name describes a field
info: |
  7. Let privateName be ? GetValue(privateNameBinding).
  8. Assert: privateName is a Private Name.
  9. If privateName.[[Kind]] is "field",
     a. If ! PrivateFieldFind(privateName, rval) is not empty, then return true.
  [...]
  11. Return false.
esid: sec-relational-operators-runtime-semantics-evaluation
features: [class-fields-private, class-fields-private-in]
---*/

let Child;

class Parent {
  #field;

  static init() {
    Child = class {
      #field;

      static isNameIn(value) {
        return #field in value;
      }
    };
  }
}

Parent.init();

assert.sameValue(Child.isNameIn(new Parent()), false);
assert.sameValue(Child.isNameIn(new Child()), true);