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

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

	let resolved = false;
	let resolvedValue = null;
	let p = new Promise((resolve) => resolve(42));
	test('Promise instanceof', p instanceof Promise, true);

	p.then(v => {
	resolved = true;
	resolvedValue = v;
	});

	let chainedValue = null;
	let p2 = new Promise(resolve => resolve(10));
	p2.then(v => v * 2).then(v => { chainedValue = v; });

	let caughtError = null;
	let p3 = new Promise((_, reject) => reject('error'));
	p3.catch(e => { caughtError = e; });

	let staticValue = null;
	Promise.resolve('static').then(v => { staticValue = v; });

	let tryValue = null;
	Promise.try(() => 'try').then(v => { tryValue = v; });

	let finallyCalled = false;
	Promise.resolve('fin').finally(() => { finallyCalled = true; });

	setTimeout(() => {
	test('resolve called', resolved, true);
	test('resolved value', resolvedValue, 42);
	test('chained value', chainedValue, 20);
	test('caught error', caughtError, 'error');
	test('static resolve', staticValue, 'static');
	test('Promise.try', tryValue, 'try');
	test('finally called', finallyCalled, true);

	let allResolved = null;
	Promise.all([Promise.resolve(1), Promise.resolve(2), Promise.resolve(3)])
	.then(arr => { allResolved = arr; });

	let raceResolved = null;
	Promise.race([Promise.resolve('first'), Promise.resolve('second')])
	.then(v => { raceResolved = v; });

	let anyResolved = null;
	Promise.any([Promise.reject('fail'), Promise.resolve('success')])
	.then(v => { anyResolved = v; });

	setTimeout(() => {
	test('Promise.all length', allResolved?.length, 3);
	test('Promise.all values', allResolved?.[0] === 1 && allResolved?.[1] === 2, true);
	test('Promise.race first', raceResolved, 'first');
	test('Promise.any success', anyResolved, 'success');
	summary();
	}, 10);
	}, 10);

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