title: Class inheritance testing with mocha: getting 'ReferenceError: config is not defined' for one class but not another
body: <p>I am testing inheritance between two classes in js and running into errors with one class but not another. Here is the two classes and the tests I am running starting with the two classes followed by the two tests:</p>
  <pre><code>class BuildingModel{
      constructor(city, lastInspect){
          this._city = city;
          this._lastInspect = lastInspect;
      }
  
      get city() {
          return this._city;
  
      }
  
      get lastInspect() {
          return this._lastInspect;
      }
  }
  module.exports = {BuildingModel};
  
  
  
  
  const { BuildingModel } = require('./building');
  
  class House extends BuildingModel{
      constructor(sqFt, address, price) {
          super(city, lastInspect)
          this._sqFt = sqFt
          this._address = address
          this._price = price
      }     
  , 
      get price() {
          return this._price
      }
  
      get address() {
          return this._address
      }
  
      get sqFt() {
          return this._sqFt
      }
  
      get city(){
          return this._city
      
      }
  
      get lastInspect(){
          return this._lastInspect
      }
  }
  
  module.exports = { 'House' : House,
                  'BuildingModel' : BuildingModel}
  
  
  
  
  
  const assert = require('assert');
  const chai = require('chai');
  const { BuildingModel } = require('../building');
  
  const expect = chai.expect;
  const assertEq = assert.deepStrictEqual
  
  
  describe('Building', function () {
      describe('#constructor', function () {
          it('Building construction working!', function () {
              const city = &quot;Fruita&quot;
              const lastInspect = 1994
              const building = new BuildingModel(city, lastInspect)
              assertEq(building.city, city)
              assertEq(building.lastInspect, lastInspect)
          });
          it('End of building test', function () {
              // ....
          });
      });
  });
  
  
  
  
  const assert = require('assert');
  const chai = require('chai');
  const { House }  = require('../house');
  
  const expect = chai.expect;
  const assertEq = assert.deepStrictEqual
  
  describe('House', function() {
    describe('#constructor', function() {
      it('Houses construction working!', function(){
              const price = 120000        
          const address = &quot;123 Lane&quot;
          const sqFt = 1200
          const house = new House(sqFt, address, price, city, lastInspect)
          assertEq(house.price, price)
          assertEq(house.address,address)
          assertEq(house.sqFt,sqFt)
      });
      it('End of house test', function(){
          // ....
      });
    });
  });
  
  </code></pre>
  <p>I think I am really close but this is the test result I am getting:</p>
  <p>Building
  #constructor
  √ Building construction working!
  √ End of building test</p>
  <p>House
  #constructor
  1) Houses construction working!
  √ End of house test</p>
  <p>3 passing (11ms)
  1 failing</p>
  <ol>
  <li>House
  #constructor
  Houses construction working!:
  ReferenceError: config is not defined
  at new House (house.js:5:15)
  at Context. (test\housetest.js:14:23)
  at processImmediate (internal/timers.js:461:21)
  npm ERR! Test failed.  See above for more details.</li>
  </ol>
  <p>Any help in showing me what I am doing wrong would be greatly appreciated. Thank you.</p>