test/parallel/test-fs-write-file.js

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'use strict';
const common = require('../common');
const assert = require('assert');
const fs = require('fs');
const join = require('path').join;

const tmpdir = require('../common/tmpdir');
tmpdir.refresh();

const filename = join(tmpdir.path, 'test.txt');

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、##济现状。\n';

fs.writeFile(filename, s, common.mustSucceed(() => {
  fs.readFile(filename, common.mustSucceed((buffer) => {
    assert.strictEqual(Buffer.byteLength(s), buffer.length);
  }));
}));

// Test that writeFile accepts buffers.
const filename2 = join(tmpdir.path, 'test2.txt');
const buf = Buffer.from(s, 'utf8');

fs.writeFile(filename2, buf, common.mustSucceed(() => {
  fs.readFile(filename2, common.mustSucceed((buffer) => {
    assert.strictEqual(buf.length, buffer.length);
  }));
}));

// Test that writeFile accepts file descriptors.
const filename4 = join(tmpdir.path, 'test4.txt');

fs.open(filename4, 'w+', common.mustSucceed((fd) => {
  fs.writeFile(fd, s, common.mustSucceed(() => {
    fs.close(fd, common.mustSucceed(() => {
      fs.readFile(filename4, common.mustSucceed((buffer) => {
        assert.strictEqual(Buffer.byteLength(s), buffer.length);
      }));
    }));
  }));
}));


{
  // Test that writeFile is cancellable with an AbortSignal.
  // Before the operation has started
  const controller = new AbortController();
  const signal = controller.signal;
  const filename3 = join(tmpdir.path, 'test3.txt');

  fs.writeFile(filename3, s, { signal }, common.mustCall((err) => {
    assert.strictEqual(err.name, 'AbortError');
  }));

  controller.abort();
}

{
  // Test that writeFile is cancellable with an AbortSignal.
  // After the operation has started
  const controller = new AbortController();
  const signal = controller.signal;
  const filename4 = join(tmpdir.path, 'test5.txt');

  fs.writeFile(filename4, s, { signal }, common.mustCall((err) => {
    assert.strictEqual(err.name, 'AbortError');
  }));

  process.nextTick(() => controller.abort());
}

{
  // Test read-only mode
  const filename = join(tmpdir.path, 'test6.txt');
  fs.writeFileSync(filename, '');
  fs.writeFile(filename, s, { flag: 'r' }, common.expectsError(/EBADF/));
}