text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  const common = require('../common');
  const assert = require('assert');
  const path = require('path');
  const fs = require('../../../../');
  
  const FILENAME = path.join(common.tmpDir, 'watch-me');
  const TIMEOUT = 1300;
  
  let nevents = 0;
  
  try {
    fs.unlinkSync(FILENAME);
  } catch (e) {
    // swallow
  }
  
  fs.watchFile(FILENAME, {interval: TIMEOUT - 250}, function(curr, prev) {
    console.log([curr, prev]);
    switch (++nevents) {
      case 1:
        assert.strictEqual(common.fileExists(FILENAME), false);
        break;
      case 2:
      case 3:
        assert.strictEqual(common.fileExists(FILENAME), true);
        break;
      case 4:
        assert.strictEqual(common.fileExists(FILENAME), false);
        fs.unwatchFile(FILENAME);
        break;
      default:
        assert(0);
    }
  });
  
  process.on('exit', function() {
    assert.strictEqual(nevents, 4);
  });
  
  setTimeout(createFile, TIMEOUT);
  
  function createFile() {
    console.log('creating file');
    fs.writeFileSync(FILENAME, 'test');
    setTimeout(touchFile, TIMEOUT);
  }
  
  function touchFile() {
    console.log('touch file');
    fs.writeFileSync(FILENAME, 'test');
    setTimeout(removeFile, TIMEOUT);
  }
  
  function removeFile() {
    console.log('remove file');
    fs.unlinkSync(FILENAME);
  }
  