JSTests/test262/test/language/expressions/in/private-field-presence-method-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 method
info: |
  7. Let privateName be ? GetValue(privateNameBinding).
  8. Assert: privateName is a Private Name.
  [...]
  10. Else,
      a. Assert: privateName.[[Kind]] is "method" or "accessor".
      b. If PrivateBrandCheck(rval, privateName) is not an abrupt completion,
         then return true.
  11. Return false.
esid: sec-relational-operators-runtime-semantics-evaluation
features: [class-methods-private, class-fields-private-in]
---*/

let Child;
let parentCount = 0;
let childCount = 0;

class Parent {
  #method() {
    parentCount += 1;
  }

  static init() {
    Child = class {
      #method() {
        childCount += 1;
      }

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

Parent.init();

assert.sameValue(Child.isNameIn(new Parent()), false);
assert.sameValue(parentCount, 0, 'parent method not invoked');
assert.sameValue(Child.isNameIn(new Child()), true);
assert.sameValue(childCount, 0, 'child method not invoked');