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

	console.log('TextEncoder/TextDecoder Tests\n');

	const encoder = new TextEncoder();
	const decoder = new TextDecoder();

	const encoded = encoder.encode('hello');
	test('TextEncoder type', encoded instanceof Uint8Array, true);
	test('TextEncoder length', encoded.length, 5);
	test('TextEncoder byte 0', encoded[0], 104);
	test('TextEncoder byte 1', encoded[1], 101);

	const decoded = decoder.decode(encoded);
	test('TextDecoder', decoded, 'hello');

	const utf8 = encoder.encode('日本語');
	test('UTF-8 encode length', utf8.length, 9);
	const utf8Decoded = decoder.decode(utf8);
	test('UTF-8 decode', utf8Decoded, '日本語');

	const emoji = encoder.encode('😀');
	test('emoji encode length', emoji.length, 4);
	test('emoji decode', decoder.decode(emoji), '😀');

	const empty = encoder.encode('');
	test('empty encode length', empty.length, 0);
	test('empty decode', decoder.decode(empty), '');

	const roundtrip = 'Hello, 世界! 🎉';
	const rt = decoder.decode(encoder.encode(roundtrip));
	test('roundtrip', rt, roundtrip);

	summary();