finalizationregistry.js
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finalizationregistry.js
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	import { test, summary } from './helpers.js';

	console.log('FinalizationRegistry Tests\n');

	let callbackCalled = false;
	const fr = new FinalizationRegistry(function(heldValue) {
	callbackCalled = true;
	});

	test('finalizationregistry instanceof', fr instanceof FinalizationRegistry, true);
	test('finalizationregistry prototype', Object.getPrototypeOf(fr) === FinalizationRegistry.prototype, true);
	test('finalizationregistry has register', typeof fr.register, 'function');
	test('finalizationregistry has unregister', typeof fr.unregister, 'function');

	const target = {};
	const token = {};
	fr.register(target, 'held value', token);

	test('finalizationregistry register returns undefined', fr.register({}, 'test'), undefined);

	const unregisterResult = fr.unregister(token);
	test('finalizationregistry unregister returns boolean', typeof unregisterResult, 'boolean');
	test('finalizationregistry unregister found token', unregisterResult, true);

	const notFoundResult = fr.unregister({});
	test('finalizationregistry unregister not found', notFoundResult, false);

	summary();

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