events.js
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events.js
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	import { test, summary } from './helpers.js';
	import { EventEmitter } from 'ant:events';

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

	const ee = new EventEmitter();

	let received = null;
	ee.on('test', (data) => {
	received = data;
	});
	ee.emit('test', 'hello');
	test('on and emit', received, 'hello');

	let count = 0;
	ee.on('count', () => count++);
	ee.on('count', () => count++);
	ee.emit('count');
	test('multiple listeners', count, 2);

	let onceValue = 0;
	ee.once('once', (val) => {
	onceValue = val;
	});
	ee.emit('once', 42);
	ee.emit('once', 100);
	test('once only fires once', onceValue, 42);

	let removed = false;
	const handler = () => { removed = true; };
	ee.on('remove', handler);
	ee.off('remove', handler);
	ee.emit('remove');
	test('off removes listener', removed, false);

	let allRemoved = 0;
	ee.on('all', () => allRemoved++);
	ee.on('all', () => allRemoved++);
	ee.removeAllListeners('all');
	ee.emit('all');
	test('removeAllListeners', allRemoved, 0);

	test('listenerCount', ee.listenerCount('count'), 2);

	const names = ee.eventNames();
	test('eventNames includes count', names.includes('count'), true);

	summary();

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