code: function helpers (options) {
    extend(helpers, Options.prototype);
    var opts = extend({}, options);
  
    helpers.option('dir', opts.dir || 'test');
    helpers.option('fixtures', helpers.options.dir + '/fixtures');
    helpers.option('actual', helpers.options.dir + '/actual');
    helpers.config(opts);
    return helpers;
  }
docs: Initialize `helpers` with default `options`.
  
  ```js
  var helpers = require('test-helpers')
  helpers({dir: 'test'})
  ```
  
  @method `helpers`
  @param {Object} `options` Default options to use.
  @api public