nodejs/test/simple/test-fs-readfile-unlink.js

// Copyright Joyent, Inc. and other Node contributors.
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var assert = require('assert'),
    common = require('../common'),
    fs = require('fs'),
    path = require('path'),
    dirName = path.resolve(common.fixturesDir, 'test-readfile-unlink'),
    fileName = path.resolve(dirName, 'test.bin');

var buf = new Buffer(512 * 1024);
buf.fill(42);

try {
  fs.mkdirSync(dirName);
} catch (e) {
  // Ignore if the directory already exists.
  if (e.code != 'EEXIST') throw e;
}

fs.writeFileSync(fileName, buf);

fs.readFile(fileName, function(err, data) {
  assert.ifError(err);
  assert(data.length == buf.length);
  assert.strictEqual(buf[0], 42);

  fs.unlinkSync(fileName);
  fs.rmdirSync(dirName);
});