Diffusion Ant (feature/nursery) Code

ant/examples/spec/finalizationregistry.js
ddfe6237cab5feature/nursery

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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