node/test/simple/test-fs-append-file-sync.js

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var common = require('../common');
var assert = require('assert');
var join = require('path').join;
var fs = require('fs');

var currentFileData = 'ABCD';

var num = 220;
var data = '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';

// test that empty file will be created and have content added
var filename = join(common.fixturesDir, 'append-sync.txt');

common.error('appending to ' + filename);
fs.appendFileSync(filename, data);

var fileData = fs.readFileSync(filename);

assert.equal(Buffer.byteLength(data), fileData.length);

// test that appends data to a non empty file
var filename2 = join(common.fixturesDir, 'append-sync2.txt');
fs.writeFileSync(filename2, currentFileData);

common.error('appending to ' + filename2);
fs.appendFileSync(filename2, data);

var fileData2 = fs.readFileSync(filename2);

assert.equal(Buffer.byteLength(data) + currentFileData.length,
             fileData2.length);

// test that appendFileSync accepts buffers
var filename3 = join(common.fixturesDir, 'append-sync3.txt');
fs.writeFileSync(filename3, currentFileData);

common.error('appending to ' + filename3);

var buf = new Buffer(data, 'utf8');
fs.appendFileSync(filename3, buf);

var fileData3 = fs.readFileSync(filename3);

assert.equal(buf.length + currentFileData.length, fileData3.length);

// test that appendFile accepts numbers.
var filename4 = join(common.fixturesDir, 'append-sync4.txt');
fs.writeFileSync(filename4, currentFileData);

common.error('appending to ' + filename4);
fs.appendFileSync(filename4, num);

var fileData4 = fs.readFileSync(filename4);

assert.equal(Buffer.byteLength('' + num) + currentFileData.length,
             fileData4.length);

//exit logic for cleanup

process.on('exit', function() {
  common.error('done');

  fs.unlinkSync(filename);
  fs.unlinkSync(filename2);
  fs.unlinkSync(filename3);
  fs.unlinkSync(filename4);
});