Przykład 3.3. toBeDefined oraz toBeUndefined

<!DOCTYPE html>
<html>

<head>
  <link data-require="jasmine@2.4.1" data-semver="2.4.1" rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/jasmine.css" />
  <script data-require="jasmine@2.4.1" data-semver="2.4.1" src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/jasmine.js"></script>
  <script data-require="jasmine@2.4.1" data-semver="2.4.1" src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/jasmine-html.js"></script>
  <script data-require="jasmine@2.4.1" data-semver="2.4.1" src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/boot.js"></script>
  <script src="car.js"></script>
  <script src="car.spec.js"></script>
</head>

<body>
  <h1>Hello Jasmine!</h1>
</body>

</html>

Car = (function () {
  function Car (engine) {
    this.engine = engine;
  }

  Car.prototype.drive = function (speed) {
    this._lastSpeed = speed;
    return 'Car with ' + this.engine + ' engine ' + 
      'drives at ' + speed + ' km/h.';
  }

  Object.defineProperty(Car.prototype, 'lastSpeed', {
    get: function () { 
      return this._lastSpeed ? this._lastSpeed : 0; 
    },
    enumerable: false,
    configurable: true
  });

  return Car;
})();

'use strict';

describe('Car class', function () {
  it('should define engine property when constructing car object', function () {
    var car = new Car('V8');

    expect(car.engine).toBeDefined();
    expect(car.engine).not.toBeUndefined();
    
    car = new Car();

    expect(car.engine).not.toBeDefined();
    expect(car.engine).toBeUndefined();
  });
});