Reuse tests or navigation functions across DalekJS files

functions.js

module.exports = {

    loginLocal: function (test) {
        test
            .open('http://thefalloftheeleventh.com')
            .type('[name="user"]', 'John Smith')
            .type('[name="pass"]', 'tardis')
            .click('button[type="submit"]')
            .done();
    },
    
    killLocalStorage: function (test) {
        test
            .execute(function () {
              window.localstorage.clear();
            })
            .wait(500)
            .done();
    }
};

test.js

var fns = require('./functions');

module.exports = {
  'clear browser storage': fns.killLocalStorage,
  'login': fns.loginLocal,
  'a test': function (test) {
      test
          .click('#aLink')
          .assert.text('#aText', 'Lorem ipsum...')
          .done();
  },
  'clear storage on end': fns.killLocalStorage
};