nodejs/test/simple/test-file-write-stream2.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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var common = require('../common');
var assert = require('assert');

var path = require('path'),
    fs = require('fs'),
    util = require('util');


var filepath = path.join(common.tmpDir, 'write.txt'),
    file;

var EXPECTED = '012345678910';

var cb_expected = 'write open drain write drain close error ',
    cb_occurred = '';

var countDrains = 0;


process.on('exit', function() {
  removeTestFile();
  if (cb_occurred !== cb_expected) {
    console.log('  Test callback events missing or out of order:');
    console.log('    expected: %j', cb_expected);
    console.log('    occurred: %j', cb_occurred);
    assert.strictEqual(cb_occurred, cb_expected,
        'events missing or out of order: "' +
        cb_occurred + '" !== "' + cb_expected + '"');
  }
});

function removeTestFile() {
  try {
    fs.unlinkSync(filepath);
  } catch (e) {}
}


removeTestFile();

file = fs.createWriteStream(filepath);

file.on('open', function(fd) {
  cb_occurred += 'open ';
  assert.equal(typeof fd, 'number');
});

file.on('drain', function() {
  cb_occurred += 'drain ';
  ++countDrains;
  if (countDrains === 1) {
    assert.equal(fs.readFileSync(filepath), EXPECTED);
    file.write(EXPECTED);
    cb_occurred += 'write ';
  } else if (countDrains == 2) {
    assert.equal(fs.readFileSync(filepath), EXPECTED + EXPECTED);
    file.end();
  }
});

file.on('close', function() {
  cb_occurred += 'close ';
  assert.strictEqual(file.bytesWritten, EXPECTED.length * 2);
  file.write('should not work anymore');
});


file.on('error', function(err) {
  cb_occurred += 'error ';
  assert.ok(err.message.indexOf('not writable') >= 0);
});


for (var i = 0; i < 11; i++) {
  assert.strictEqual(file.write(i), false);
}
cb_occurred += 'write ';