| // Copyright (C) 2019 Leo Balter. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-finalization-group.prototype.register |
| description: Throws a TypeError if this does not have a [[Cells]] internal slot |
| info: | |
| FinalizationGroup.prototype.register ( target , holdings [, unregisterToken ] ) |
| |
| 1. Let finalizationGroup be the this value. |
| 2. If Type(finalizationGroup) is not Object, throw a TypeError exception. |
| 3. If Type(target) is not Object, throw a TypeError exception. |
| 4. If finalizationGroup does not have a [[Cells]] internal slot, throw a TypeError exception. |
| ... |
| features: [FinalizationGroup, WeakRef] |
| ---*/ |
| |
| assert.sameValue(typeof FinalizationGroup.prototype.register, 'function'); |
| |
| var register = FinalizationGroup.prototype.register; |
| var target = {}; |
| |
| assert.throws(TypeError, function() { |
| register.call({ ['[[Cells]]']: {} }, target); |
| }, 'Ordinary object without [[Cells]]'); |
| |
| assert.throws(TypeError, function() { |
| register.call(WeakRef.prototype, target); |
| }, 'WeakRef.prototype does not have a [[Cells]] internal slot'); |
| |
| assert.throws(TypeError, function() { |
| register.call(WeakRef, target); |
| }, 'WeakRef does not have a [[Cells]] internal slot'); |
| |
| var wr = new WeakRef({}); |
| assert.throws(TypeError, function() { |
| register.call(wr, target); |
| }, 'WeakRef instance'); |
| |
| var wm = new WeakMap(); |
| assert.throws(TypeError, function() { |
| register.call(wm, target); |
| }, 'WeakMap instance'); |
| |
| var ws = new WeakSet(); |
| assert.throws(TypeError, function() { |
| register.call(ws, target); |
| }, 'WeakSet instance'); |