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

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

	test('performance exists', typeof performance, 'object');
	test('performance toStringTag', Object.prototype.toString.call(performance), '[object Performance]');

	const t1 = performance.now();
	test('now returns number', typeof t1, 'number');
	test('now returns positive', t1 >= 0, true);

	let sum = 0;
	for (let i = 0; i < 10000; i++) sum += i;
	const t2 = performance.now();
	test('now advances', t2 >= t1, true);

	test('timeOrigin exists', typeof performance.timeOrigin, 'number');
	test('timeOrigin positive', performance.timeOrigin > 0, true);
	test('timeOrigin before now', performance.timeOrigin <= Date.now(), true);

	summary();

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