Node.js unittest模拟量角器$模块

Question

一些背景知识：我想为以下功能编写单元测试。但是，每当我将该功能导入单元测试并尝试运行它时，我都会收到ReferenceError: $ is not defined。 $来自量角器库，因此我一直在寻找一种对它进行存根的方法，但我一直无法找到一种方法来做到这一点。到目前为止，我已经尝试使用sinon和嘲笑库。

我的问题是我该如何模拟$以便为此编写单元测试？

const { $ } = require('protractor');

/**
 * Function for resolving object types.
 *
 *
 * resolveType($('.save-button'));
 * ```
 *
 * @param {*} locator
 * @return {Object} returns object with the element, a selector, and
 *                  it's description for element
 */
module.exports = function verifyType(locator) {

  return {
    element: $(mySelector),
    selector: mySelector,
    description: locator.description,
  };
};

更新-这是我目前为此所做的单元测试尝试。它以ReferenceError: $ is not defined失败：

const resolveType = require('../../path/toResolveType').resolveType;
const mochaccino = require('mochaccino');

const { expect } = mochaccino;
const sinon = require('sinon');
const { $ } = require('protractor');

const locator_a = { description: '"embed ID" text box', selector: '#embed-id' };


describe('commands.resolveType', function() {
  beforeEach(function () {
    sinon.stub($).returns('test');
  });

  afterEach(function () {
    $.restore();
  });

  it('Standard locator with CSS selector', function() {
    const answer = resolveType(locator_a);
    // Placeholder till I can get answer to evaluate.
    expect('a').toEqual('a');
  });
});