/**
  * Tests observer class when initialized by constructor.
  */
 public function testObserverConstructor()
 {
     // Create observer passing in notification method and context
     $observer = new Observer('observerTestMethod', $this);
     // create a test note, setting a body value and notify
     // the observer with it. since the observer is this class
     // and the notification method is observerTestMethod,
     // successful notification will result in our local
     // observerTestVar being set to the value we pass in
     // on the note body.
     $note = new Notification('ObserverTestNote', 5);
     $observer->notifyObserver($note);
     // test assertions
     $this->assertTrue($this->observerTestVar == 5, "Expecting observerTestVar = 5");
 }