使用karma-jasmine测试规范中的对象属性更改

Question

我正在尝试测试一个简单的对象，并跟踪它自己的被它自己的方法改变的属性。不知怎么的，在启动这些方法之后，属性的值并没有改变：

​

it('extending an object with new properties', function() {
  var newCar = Object.create(car);
  newCar.climatronicOn = false;
  newCar.startClimatronic = function(){
      newCar.climatronicOn = true;
  }
  newCar.stopClimatronic = function(){
      newCar.climatronicOn = false;
  }

  spyOn(newCar, 'startClimatronic');
  spyOn(newCar, 'stopClimatronic');

  // properties
  expect(newCar.hasOwnProperty("climatronicOn")).toBeTruthy();
  expect(typeof newCar.climatronicOn).toEqual("boolean");

  // methods
  expect(newCar.hasOwnProperty("startClimatronic")).toBeTruthy();
  expect(typeof newCar.startClimatronic).toEqual("function");

  expect(newCar.hasOwnProperty("stopClimatronic")).toBeTruthy();
  expect(typeof newCar.stopClimatronic).toEqual("function");

  // running methods
  newCar.startClimatronic();  // should change the newCar.climatronicOn to true
  expect(newCar.startClimatronic).toHaveBeenCalled();             // true
  expect(newCar.climatronicOn).toBeTruthy();  // false, I expected true
  });

​

我看到过一些关于使用getters和setters而不是object文字，然后使用spyOnProperty的提示，但我不知道在尝试保持newCar.climatronicOn()和newCar.climatronicOff()的形式时如何设置和运行它。如何检查这些方法是否更新了父对象的属性？

我来自package.json的devDependencies：

"babel-polyfill": "^6.16.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-es2016": "^6.24.1",
"babel-preset-es2017": "^6.24.1",
"jasmine-core": "^2.5.2",
"karma": "^0.13.20",
"karma-babel-preprocessor": "^6.0.1",
"karma-chrome-launcher": "^0.2.2",
"karma-es6-shim": "^1.0.0",
"karma-firefox-launcher": "^0.1.7",
"karma-ie-launcher": "^0.2.0",
"karma-jasmine": "^0.3.7",
"karma-phantomjs-launcher": "^1.0.0",
"karma-spec-reporter": "0.0.26",
"phantomjs-prebuilt": "^2.1.3",
"run-sequence": "^1.2.2"