Upload Kmake

deps/v8/test/mjsunit/harmony/weakrefs/symbol-as-weakref-target.js

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+// Copyright 2022 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.
+
+(function TestRegisterWithSymbolTarget() {
+  const fg = new FinalizationRegistry(() => { });
+  fg.register(Symbol('123'), 'holdings');
+  // Registered symbols cannot be the target.
+  assertThrows(() => fg.register(Symbol.for('123'), 'holdings'), TypeError);
+})();
+
+(function TestRegisterWithSymbolUnregisterToken() {
+  const fg = new FinalizationRegistry(() => { });
+  fg.register({}, 'holdings', Symbol('123'));
+  // Registered symbols cannot be the unregister token.
+  assertThrows(() => fg.register({}, 'holdings', Symbol.for('123')), TypeError);
+})();
+
+(function TestRegisterSymbolAndHoldingsSameValue() {
+  const fg = new FinalizationRegistry(() => {});
+  const obj = Symbol('123');
+  // SameValue(target, holdings) not ok.
+  assertThrows(() => fg.register(obj, obj), TypeError);
+  const holdings = {a: 1};
+  fg.register(obj, holdings);
+})();
+
+(function TestUnregisterWithSymbolUnregisterToken() {
+  const fg = new FinalizationRegistry(() => {});
+  fg.unregister(Symbol('123'));
+  // Registered symbols cannot be the unregister token.
+  assertThrows(() => fg.unregister(Symbol.for('123')), TypeError);
+})();
+
+(function TestWeakRefConstructorWithSymbol() {
+  new WeakRef(Symbol('123'));
+  // Registered symbols cannot be the WeakRef target.
+  assertThrows(() => new WeakRef(Symbol.for('123')), TypeError);
+})();