API/api.medcify.app/node_modules/continuation-local-storage/test/fs.tap.js

'use strict';

var createNamespace = require('../context.js').createNamespace
  , fs              = require('fs')
  , path            = require('path')
  , exec            = require('child_process').exec
  , tap             = require('tap')
  , test            = tap.test
  ;

// CONSTANTS
var FILENAME     = '__testfile'
  , DIRNAME      = '__TESTDIR'
  , LINKNAME     = '__testlink'
  , HARDLINKNAME = '__testhardlink'
  ;

function createFile(assert) {
  var contents = new Buffer("UHOH")
    , file     = fs.openSync(FILENAME, 'w')
    , written  = fs.writeSync(file, contents, 0, contents.length, 0)
    ;
  assert.equals(written, contents.length, "whole buffer was written");
  var rc = fs.closeSync(file);
  // need this here to avoid dealing with umask complications
  fs.chmodSync(FILENAME, '0666');
  return rc;
}

function deleteFile() { return fs.unlinkSync(FILENAME); }


function createLink(assert) {
  createFile(assert);
  fs.symlinkSync(FILENAME, LINKNAME);
  if (fs.lchmodSync) {
    // This function only exists on BSD systems (like OSX)
    fs.lchmodSync(LINKNAME, '0777');
  }
}

function deleteLink() {
  fs.unlinkSync(LINKNAME);
  return deleteFile();
}


function createDirectory(assert) {
  fs.mkdirSync(DIRNAME);
  assert.ok(fs.existsSync(DIRNAME), "directory was created");
}

function deleteDirectory() { return fs.rmdirSync(DIRNAME); }


function mapIds(username, groupname, callback) {
  if (!callback) throw new Error("mapIds requires callback");
  if (!username) return callback(new Error("mapIds requires username"));
  if (!groupname) return callback(new Error("mapIds requires groupname"));

  exec('id -u ' + username, function (error, stdout, stderr) {
    if (error) return callback(error);
    if (stderr) return callback(new Error(stderr));

    var uid = +stdout;
    exec('id -g ' + groupname, function (error, stdout, stderr) {
      if (error) return callback(error);
      if (stderr) return callback(new Error(stderr));

      var gid = +stdout;
      callback(null, uid, gid);
    });
  });
}

test("continuation-local state with MakeCallback and fs module", function (t) {
  t.plan(33);

  var namespace = createNamespace('fs');
  namespace.run(function () {
    namespace.set('test', 0xabad1dea);
    t.test("fs.rename", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'rename');
        t.equal(namespace.get('test'), 'rename', "state has been mutated");

        fs.rename(FILENAME, '__renamed', function (error) {
          t.notOk(error, "renaming shouldn't error");
          t.equal(namespace.get('test'), 'rename',
                  "mutated state has persisted to fs.rename's callback");

          fs.unlinkSync('__renamed');
          t.end();
        });
      });
    });

    t.test("fs.truncate", function (t) {
      // truncate -> ftruncate in Node > 0.8.x
      if (!fs.ftruncate) return t.end();

      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'truncate');
        t.equal(namespace.get('test'), 'truncate', "state has been mutated");

        fs.truncate(FILENAME, 0, function (error) {
          t.notOk(error, "truncation shouldn't error");

          var stats = fs.statSync(FILENAME);
          t.equal(stats.size, 0, "file has been truncated");

          t.equal(namespace.get('test'), 'truncate',
                  "mutated state has persisted to fs.truncate's callback");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.ftruncate", function (t) {
      createFile(t);

      // truncate -> ftruncate in Node > 0.8.x
      var truncate = fs.ftruncate ? fs.ftruncate : fs.truncate;

      namespace.run(function () {
        namespace.set('test', 'ftruncate');
        t.equal(namespace.get('test'), 'ftruncate', "state has been mutated");

        var file = fs.openSync(FILENAME, 'w');
        truncate(file, 0, function (error) {
          t.notOk(error, "truncation shouldn't error");

          fs.closeSync(file);
          var stats = fs.statSync(FILENAME);
          t.equal(stats.size, 0, "file has been truncated");

          t.equal(namespace.get('test'), 'ftruncate',
                  "mutated state has persisted to fs.ftruncate's callback");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.chown", function (t) {
      createFile(t);

      mapIds('daemon', 'daemon', function (error, uid, gid) {
        t.notOk(error, "looking up uid & gid shouldn't error");
        t.ok(uid, "uid for daemon was found");
        t.ok(gid, "gid for daemon was found");

        namespace.run(function () {
          namespace.set('test', 'chown');
          t.equal(namespace.get('test'), 'chown', "state has been mutated");

          fs.chown(FILENAME, uid, gid, function (error) {
            t.ok(error, "changing ownership will error for non-root users");

            t.equal(namespace.get('test'), 'chown',
                    "mutated state has persisted to fs.chown's callback");

            deleteFile();
            t.end();
          });
        });
      });
    });

    t.test("fs.fchown", function (t) {
      createFile(t);

      mapIds('daemon', 'daemon', function (error, uid, gid) {
        t.notOk(error, "looking up uid & gid shouldn't error");
        t.ok(uid, "uid for daemon was found");
        t.ok(gid, "gid for daemon was found");

        namespace.run(function () {
          namespace.set('test', 'fchown');
          t.equal(namespace.get('test'), 'fchown', "state has been mutated");

          var file = fs.openSync(FILENAME, 'w');
          fs.fchown(file, uid, gid, function (error) {
            t.ok(error, "changing ownership will error for non-root users");

            t.equal(namespace.get('test'), 'fchown',
                    "mutated state has persisted to fs.fchown's callback");

            fs.closeSync(file);
            deleteFile();
            t.end();
          });
        });
      });
    });

    t.test("fs.lchown", function (t) {
      if (!fs.lchown) return t.end();
      createLink(t);

      mapIds('daemon', 'daemon', function (error, uid, gid) {
        t.notOk(error, "looking up uid & gid shouldn't error");
        t.ok(uid, "uid for daemon was found");
        t.ok(gid, "gid for daemon was found");

        namespace.run(function () {
          namespace.set('test', 'lchown');
          t.equal(namespace.get('test'), 'lchown', "state has been mutated");

          fs.lchown(LINKNAME, uid, gid, function (error) {
            t.ok(error, "changing ownership will error for non-root users");

            t.equal(namespace.get('test'), 'lchown',
                    "mutated state has persisted to fs.lchown's callback");

            deleteLink();
            t.end();
          });
        });
      });
    });

    t.test("fs.chmod", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'chmod');
        t.equal(namespace.get('test'), 'chmod', "state has been mutated");

        fs.chmod(FILENAME, '0700', function (error) {
          t.notOk(error, "changing mode shouldn't error");

          t.equal(namespace.get('test'), 'chmod',
                  "mutated state has persisted to fs.chmod's callback");

          var stats = fs.statSync(FILENAME);
          t.equal(stats.mode.toString(8), '100700', "extra access bits are stripped");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.fchmod", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'fchmod');
        t.equal(namespace.get('test'), 'fchmod', "state has been mutated");

        var file = fs.openSync(FILENAME, 'w+');
        fs.fchmod(file, '0700', function (error) {
          t.notOk(error, "changing mode shouldn't error");

          t.equal(namespace.get('test'), 'fchmod',
                  "mutated state has persisted to fs.fchmod's callback");

          fs.closeSync(file);
          var stats = fs.statSync(FILENAME);
          t.equal(stats.mode.toString(8), '100700', "extra access bits are stripped");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.lchmod", function (t) {
      if (!fs.lchmod) return t.end();
      createLink(t);

      namespace.run(function () {
        namespace.set('test', 'lchmod');
        t.equal(namespace.get('test'), 'lchmod', "state has been mutated");

        fs.lchmod(LINKNAME, '0700', function (error) {
          t.notOk(error, "changing mode shouldn't error");

          t.equal(namespace.get('test'), 'lchmod',
                  "mutated state has persisted to fs.lchmod's callback");

          var stats = fs.lstatSync(LINKNAME);
          t.equal(stats.mode.toString(8), '120700', "extra access bits are stripped");

          deleteLink();
          t.end();
        });
      });
    });

    t.test("fs.stat", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'stat');
        t.equal(namespace.get('test'), 'stat', "state has been mutated");

        fs.stat(FILENAME, function (error, stats) {
          t.notOk(error, "reading stats shouldn't error");

          t.equal(namespace.get('test'), 'stat',
                  "mutated state has persisted to fs.stat's callback");

          t.equal(stats.mode.toString(8), '100666', "permissions should be as created");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.fstat", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'fstat');
        t.equal(namespace.get('test'), 'fstat', "state has been mutated");

        var file = fs.openSync(FILENAME, 'r');
        fs.fstat(file, function (error, stats) {
          t.notOk(error, "reading stats shouldn't error");

          t.equal(namespace.get('test'), 'fstat',
                  "mutated state has persisted to fs.fstat's callback");

          t.equal(stats.mode.toString(8), '100666', "permissions should be as created");

          fs.closeSync(file);
          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.lstat", function (t) {
      createLink(t);

      namespace.run(function () {
        namespace.set('test', 'lstat');
        t.equal(namespace.get('test'), 'lstat', "state has been mutated");

        fs.lstat(LINKNAME, function (error, stats) {
          t.notOk(error, "reading stats shouldn't error");

          t.equal(namespace.get('test'), 'lstat',
                  "mutated state has persisted to fs.lstat's callback");

          t.equal(
            stats.mode.toString(8),
            '120777',
            "permissions should be as created"
          );

          deleteLink();
          t.end();
        });
      });
    });

    t.test("fs.link", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'link');
        t.equal(namespace.get('test'), 'link', "state has been mutated");

        fs.link(FILENAME, HARDLINKNAME, function (error) {
          t.notOk(error, "creating a link shouldn't error");

          t.equal(namespace.get('test'), 'link',
                  "mutated state has persisted to fs.link's callback");

          var orig   = fs.statSync(FILENAME)
            , linked = fs.statSync(HARDLINKNAME)
            ;
          t.equal(orig.ino, linked.ino, "entries should point to same file");

          t.notOk(fs.unlinkSync(HARDLINKNAME), "link has been removed");
          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.symlink", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'symlink');
        t.equal(namespace.get('test'), 'symlink', "state has been mutated");

        fs.symlink(FILENAME, LINKNAME, function (error) {
          t.notOk(error, "creating a symlink shouldn't error");

          t.equal(namespace.get('test'), 'symlink',
                  "mutated state has persisted to fs.symlink's callback");

          var pointed = fs.readlinkSync(LINKNAME);
          t.equal(pointed, FILENAME, "symlink points back to original file");

          t.notOk(fs.unlinkSync(LINKNAME), "symlink has been removed");
          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.readlink", function (t) {
      createLink(t);

      namespace.run(function () {
        namespace.set('test', 'readlink');
        t.equal(namespace.get('test'), 'readlink', "state has been mutated");

        fs.readlink(LINKNAME, function (error, pointed) {
          t.notOk(error, "reading symlink shouldn't error");

          t.equal(namespace.get('test'), 'readlink',
                  "mutated state has persisted to fs.readlink's callback");

          t.equal(pointed, FILENAME, "symlink points back to original file");

          deleteLink();
          t.end();
        });
      });
    });

    t.test("fs.unlink", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'unlink');
        t.equal(namespace.get('test'), 'unlink', "state has been mutated");

        fs.unlink(FILENAME, function (error) {
          t.notOk(error, "deleting file shouldn't error");

          t.equal(namespace.get('test'), 'unlink',
                  "mutated state has persisted to fs.unlink's callback");

          t.notOk(fs.exists(FILENAME), "file should be gone");
          t.end();
        });
      });
    });

    t.test("fs.realpath", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'realpath');
        t.equal(namespace.get('test'), 'realpath', "state has been mutated");

        fs.realpath(FILENAME, function (error, real) {
          t.notOk(error, "deleting file shouldn't error");

          t.equal(namespace.get('test'), 'realpath',
                  "mutated state has persisted to fs.realpath's callback");

          t.equal(real, path.resolve(FILENAME), "no funny business with the real path");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.mkdir", function (t) {
      namespace.run(function () {
        namespace.set('test', 'mkdir');
        t.equal(namespace.get('test'), 'mkdir', "state has been mutated");

        fs.mkdir(DIRNAME, function (error) {
          t.notOk(error, "creating directory shouldn't error");

          t.equal(namespace.get('test'), 'mkdir',
                  "mutated state has persisted to fs.mkdir's callback");

          t.ok(fs.existsSync(DIRNAME), "directory was created");

          fs.rmdirSync(DIRNAME);
          t.end();
        });
      });
    });

    t.test("fs.rmdir", function (t) {
      createDirectory(t);

      namespace.run(function () {
        namespace.set('test', 'rmdir');
        t.equal(namespace.get('test'), 'rmdir', "state has been mutated");

        fs.rmdir(DIRNAME, function (error) {
          t.notOk(error, "deleting directory shouldn't error");

          t.equal(namespace.get('test'), 'rmdir',
                  "mutated state has persisted to fs.rmdir's callback");

          t.notOk(fs.existsSync(DIRNAME), "directory was removed");

          t.end();
        });
      });
    });

    t.test("fs.readdir", function (t) {
      createDirectory(t);

      var file1 = fs.openSync(path.join(DIRNAME, 'file1'), 'w');
      fs.writeSync(file1, 'one');
      fs.closeSync(file1);

      var file2 = fs.openSync(path.join(DIRNAME, 'file2'), 'w');
      fs.writeSync(file2, 'two');
      fs.closeSync(file2);

      var file3 = fs.openSync(path.join(DIRNAME, 'file3'), 'w');
      fs.writeSync(file3, 'three');
      fs.closeSync(file3);

      namespace.run(function () {
        namespace.set('test', 'readdir');
        t.equal(namespace.get('test'), 'readdir', "state has been mutated");

        fs.readdir(DIRNAME, function (error, contents) {
          t.notOk(error, "reading directory shouldn't error");

          t.equal(namespace.get('test'), 'readdir',
                  "mutated state has persisted to fs.readdir's callback");

          t.equal(contents.length, 3, "3 files were found");

          fs.unlinkSync(path.join(DIRNAME, 'file1'));
          fs.unlinkSync(path.join(DIRNAME, 'file2'));
          fs.unlinkSync(path.join(DIRNAME, 'file3'));
          deleteDirectory();
          t.end();
        });
      });
    });

    t.test("fs.watch", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'watch');
        t.equal(namespace.get('test'), 'watch', "state has been mutated");

        var watcher = fs.watch(FILENAME,
                               {persistent : false, interval : 200},
                               function (event) {
          t.equal(namespace.get('test'), 'watch',
                  "mutated state has persisted to fs.watch's callback");

          t.equal(event, 'change', "file was changed");

          watcher.close();
          process.nextTick(function cleanup() {
            deleteFile();
            t.end();
          });
        });

        setTimeout(function poke() {
          fs.writeFileSync(FILENAME, 'still a test');
        }, 20);
      });
    });

    t.test("fs.utimes", function (t) {
      createFile(t);

      /* utimes(2) takes seconds since the epoch, and Date() deals with
       * milliseconds. I just want a date some time in the past.
       */
      var PASTIME = new Date(Math.floor((Date.now() - 31337) / 1000) * 1000);

      namespace.run(function () {
        namespace.set('test', 'utimes');
        t.equal(namespace.get('test'), 'utimes', "state has been mutated");

        var before = fs.statSync(FILENAME);
        t.ok(before.atime, "access time of newly-created file set");
        t.ok(before.mtime, "modification time of newly-created file set");

        fs.utimes(FILENAME, PASTIME, PASTIME, function (error) {
          t.notOk(error, "setting utimes shouldn't error");

          t.equal(namespace.get('test'), 'utimes',
                  "mutated state has persisted to fs.utimes's callback");

          var after = fs.statSync(FILENAME);
          t.deepEqual(after.atime, PASTIME, "access time of newly-created file is reset");
          t.deepEqual(after.mtime, PASTIME, "mod time of newly-created file is reset");
          t.notDeepEqual(before.atime, after.atime, "access time changed");
          t.notDeepEqual(before.mtime, after.mtime, "mod time changed");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.futimes", function (t) {
      createFile(t);

      /* futimes(2) takes seconds since the epoch, and Date() deals with
       * milliseconds. I just want a date some time in the past.
       */
      var PASTIME = new Date(Math.floor((Date.now() - 0xb33fd) / 1000) * 1000);

      namespace.run(function () {
        namespace.set('test', 'futimes');
        t.equal(namespace.get('test'), 'futimes', "state has been mutated");

        var before = fs.statSync(FILENAME);
        t.ok(before.atime, "access time of newly-created file set");
        t.ok(before.mtime, "modification time of newly-created file set");

        var file = fs.openSync(FILENAME, "w+");
        fs.futimes(file, PASTIME, PASTIME, function (error) {
          t.notOk(error, "setting futimes shouldn't error");
          fs.closeSync(file);

          t.equal(namespace.get('test'), 'futimes',
                  "mutated state has persisted to fs.futimes's callback");

          var after = fs.statSync(FILENAME);
          t.deepEqual(after.atime, PASTIME, "access time of newly-created file is reset");
          t.deepEqual(after.mtime, PASTIME, "mod time of newly-created file is reset");
          t.notDeepEqual(before.atime, after.atime, "access time changed");
          t.notDeepEqual(before.mtime, after.mtime, "mod time changed");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.fsync", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'fsync');
        t.equal(namespace.get('test'), 'fsync', "state has been mutated");

        var file = fs.openSync(FILENAME, 'w+');
        fs.fsync(file, function (error) {
          t.notOk(error, "syncing the file shouldn't error");

          t.equal(namespace.get('test'), 'fsync',
                  "mutated state has persisted to fs.fsync's callback");

          fs.closeSync(file);
          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.open", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'open');
        t.equal(namespace.get('test'), 'open', "state has been mutated");

        fs.open(FILENAME, 'r', function (error, file) {
          t.notOk(error, "opening the file shouldn't error");

          t.equal(namespace.get('test'), 'open',
                  "mutated state has persisted to fs.open's callback");


          var contents = new Buffer(4);
          fs.readSync(file, contents, 0, 4, 0);
          t.equal(contents.toString(), 'UHOH', "contents are still available");

          fs.closeSync(file);
          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.close", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'close');
        t.equal(namespace.get('test'), 'close', "state has been mutated");

        var file = fs.openSync(FILENAME, 'r');
        fs.close(file, function (error) {
          t.notOk(error, "closing the file shouldn't error");

          t.equal(namespace.get('test'), 'close',
                  "mutated state has persisted to fs.close's callback");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.read", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'read');
        t.equal(namespace.get('test'), 'read', "state has been mutated");

        var file     = fs.openSync(FILENAME, 'r')
          , contents = new Buffer(4)
          ;
        fs.read(file, contents, 0, 4, 0, function (error) {
          t.notOk(error, "reading from the file shouldn't error");

          t.equal(namespace.get('test'), 'read',
                  "mutated state has persisted to fs.read's callback");

          t.equal(contents.toString(), 'UHOH', "contents are still available");

          fs.closeSync(file);
          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.write", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'write');
        t.equal(namespace.get('test'), 'write', "state has been mutated");

        var file     = fs.openSync(FILENAME, 'w')
          , contents = new Buffer('yeap')
          ;
        fs.write(file, contents, 0, 4, 0, function (error) {
          t.notOk(error, "writing to the file shouldn't error");

          t.equal(namespace.get('test'), 'write',
                  "mutated state has persisted to fs.write's callback");

          fs.closeSync(file);

          var readback = fs.readFileSync(FILENAME);
          t.equal(readback.toString(), 'yeap', "contents are still available");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.readFile", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'readFile');
        t.equal(namespace.get('test'), 'readFile', "state has been mutated");

        fs.readFile(FILENAME, function (error, contents) {
          t.notOk(error, "reading from the file shouldn't error");

          t.equal(namespace.get('test'), 'readFile',
                  "mutated state has persisted to fs.readFile's callback");

          t.equal(contents.toString(), 'UHOH', "contents are still available");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.writeFile", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'writeFile');
        t.equal(namespace.get('test'), 'writeFile', "state has been mutated");

        fs.writeFile(FILENAME, 'woopwoop', function (error) {
          t.notOk(error, "rewriting the file shouldn't error");

          t.equal(namespace.get('test'), 'writeFile',
                  "mutated state has persisted to fs.writeFile's callback");

          var readback = fs.readFileSync(FILENAME);
          t.equal(readback.toString(), 'woopwoop', "rewritten contents are available");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.appendFile", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'appendFile');
        t.equal(namespace.get('test'), 'appendFile', "state has been mutated");

        fs.appendFile(FILENAME, '/jk', function (error) {
          t.notOk(error, "appending to the file shouldn't error");

          t.equal(namespace.get('test'), 'appendFile',
                  "mutated state has persisted to fs.appendFile's callback");

          var readback = fs.readFileSync(FILENAME);
          t.equal(readback.toString(), 'UHOH/jk',
                  "appended contents are still available");

          deleteFile();
          t.end();
        });
      });
    });

    t.test("fs.exists", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'exists');
        t.equal(namespace.get('test'), 'exists', "state has been mutated");

        fs.exists(FILENAME, function (yep) {
          t.equal(namespace.get('test'), 'exists',
                  "mutated state has persisted to fs.exists's callback");

          t.ok(yep, "precreated file does indeed exist.");

          fs.exists('NOPENOWAY', function (nope) {
            t.equal(namespace.get('test'), 'exists',
                    "mutated state continues to persist to fs.exists's second callback");

            t.notOk(nope, "nonexistent file doesn't exist.");

            deleteFile();
            t.end();
          });
        });
      });
    });

    t.test("fs.watchFile", function (t) {
      createFile(t);

      namespace.run(function () {
        namespace.set('test', 'watchFile');
        t.equal(namespace.get('test'), 'watchFile', "state has been mutated");

        var options = {
          persistent: true,
          interval: 20
        };

        fs.watchFile(FILENAME, options, function (before, after) {
          t.equal(namespace.get('test'), 'watchFile',
                  "mutated state has persisted to fs.watchFile's callback");

          t.ok(before.ino, "file has an entry");
          t.equal(before.ino, after.ino, "file is at the same location");

          fs.unwatchFile(FILENAME);
          process.nextTick(function () {
            deleteFile();
            t.end();
          });
        });

        setTimeout(function poke() {
          fs.appendFileSync(FILENAME, 'still a test');
        }, 20);
      });
    });
  });
});