How to add global variables used by all tests in Javascript?

Question

I could not find how to remove code duplication in Javascript (basically what I would achieve in Java with base classes).

A specific example is (at least) the following code, which is common to all specification files (and potentially page objects, since I am testing this template in protractor):

var chai = require("chai");
var chaiAsPromised = require("chai-as-promised");
chai.use(chaiAsPromised);
var expect = chai.expect;

Can I do something that can be expected everywhere? I tried in the protractor configuration to upload a file with this parameter:

specs: [
  'e2e/helpers/commonDefinitions.js',
  'e2e/**/*.spec.js'
]

or use beforeLaunch or onPrepare (but want a function not sure how to set vars this way), but without success.

However, I would prefer to use a generic Javascript approach to reusing this type.

- , (, , )?

Answer 1

, :

assert-styles.js

var chai = require('chai');
var chaiAsPromised = require('chai-as-promised');
chai.use(chaiAsPromised);
var expect = chai.expect;
var should = chai.should;

module.exports = {
  expect: expect,
  should: should
};

:

test1.js

var assertStyles = require('./assert-styles');
var expect = assertStyles.expect;
var should = assertStyles.should;