@zenfs/core/tests/fs/writeFile.test.ts

A filesystem, anywhere

import assert from 'node:assert';
import { suite, test } from 'node:test';
import { fs } from '../common.js';

const s =
	'南越国是前203年至前111年存在于岭南地区的一个国家，国都位于番禺，疆域包括今天中国的广东、广西两省区的大部份地区，福建省、湖南、贵州、云南的一小部份地区和越南的北部。南越国是秦朝灭亡后，由南海郡尉赵佗于前203年起兵兼并桂林郡和象郡后建立。前196年和前179年，南越国曾先后两次名义上臣属于西汉，成为西汉的“外臣”。前112年，南越国末代君主赵建德与西汉发生战争，被汉武帝于前111年所灭。南越国共存在93年，历经五代君主。南越国是岭南地区的第一个有记载的政权国家，采用封建制和郡县制并存的制度，它的建立保证了秦末乱世岭南地区社会秩序的稳定，有效的改善了岭南地区落后的政治、经济现状。\n';

suite('writeFile', () => {
	test('write and read file with specified content', async () => {
		const filename = 'test.txt';
		await fs.promises.writeFile(filename, s);
		const data = await fs.promises.readFile(filename);
		assert(data.length === Buffer.from(s).length);
		await fs.promises.unlink(filename);
	});

	test('write and read file using buffer', async () => {
		const filename = 'test2.txt';
		const expected = Buffer.from(s, 'utf8');

		await fs.promises.writeFile(filename, expected);
		const actual = await fs.promises.readFile(filename);
		assert(actual.length === expected.length);

		await fs.promises.unlink(filename);
	});

	test('write base64 data to a file and read it back asynchronously', async () => {
		const data =
			'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';

		const buffer = Buffer.from(data, 'base64');
		const filePath = 'test.jpg';

		await fs.promises.writeFile(filePath, buffer);

		const read = await fs.promises.readFile(filePath, 'base64');
		assert(read === data);
	});
});

suite('File Writing with Custom Mode', () => {
	test('write file synchronously with custom mode', () => {
		const file = 'testWriteFileSync.txt';
		const mode = 0o755;

		fs.writeFileSync(file, '123', { mode });

		const content = fs.readFileSync(file, 'utf8');
		assert(content === '123');
		assert((fs.statSync(file).mode & 0o777) === mode);

		fs.unlinkSync(file);
	});

	test('append to a file synchronously with custom mode', () => {
		const file = 'testAppendFileSync.txt';
		const mode = 0o755;

		fs.appendFileSync(file, 'abc', { mode });

		const content = fs.readFileSync(file, { encoding: 'utf8' });
		assert(content === 'abc');

		assert((fs.statSync(file).mode & 0o777) === mode);

		fs.unlinkSync(file);
	});
});