can't get this test to work with newer versions of tap

fs.watchFile.tap.js

'use strict';

var createNamespace = require('continuation-local-storage').createNamespace
  , fs              = require('fs')
  , tap             = require('tap')
  , test            = tap.test
  ;

// CONSTANTS
var FILENAME     = '__testfile';

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); }

test("continuation-local state with MakeCallback and fs module", function (t) {
  t.plan(1);

  var namespace = createNamespace('fs');
  namespace.run(function () {
    namespace.set('test', 0xabad1dea);

    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");

        fs.watchFile(FILENAME,
                     {persistent : false, interval : 20},
                     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);
      });
    });
  });
});

package.json

{
  "name": "test-cls-watchfile",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "Forrest L Norvell <[email protected]>",
  "license": "ISC",
  "dependencies": {
    "continuation-local-storage": "^3.1.4"
  },
  "devDependencies": {
    "tap": "^5.2.0"
  }
}