test262/implementation-contributed/v8/mjsunit/harmony/weakrefs/basics.js

// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --harmony-weak-refs

(function TestConstructWeakFactory() {
  let wf = new WeakFactory();
  assertEquals(wf.toString(), "[object WeakFactory]");
  assertNotSame(wf.__proto__, Object.prototype);
  assertSame(wf.__proto__.__proto__, Object.prototype);
})();

(function TestWeakFactoryConstructorCallAsFunction() {
  let caught = false;
  let message = "";
  try {
    let f = WeakFactory();
  } catch (e) {
    message = e.message;
    caught = true;
  } finally {
    assertTrue(caught);
    assertEquals(message, "Constructor WeakFactory requires 'new'");
  }
})();

(function TestMakeCell() {
  let wf = new WeakFactory();
  let wc = wf.makeCell({});
  assertEquals(wc.toString(), "[object WeakCell]");
  assertNotSame(wc.__proto__, Object.prototype);
  assertSame(wc.__proto__.__proto__, Object.prototype);
})();

(function TestMakeCellWithoutWeakFactory() {
  assertThrows(() => WeakFactory.prototype.makeCell.call({}, {}), TypeError);
})();