/**
*
*/
public function testObserver()
{
// create the concrete objects
$observer = new TestObserver();
$subject = new TestSubject();
// init attributes. Notify() will be called and should not throw an exception,
// even though there are no observers registered yet.
$subject->setAttributes(array('one', 'two'));
// attach observer to subject
$subject->attachObserver($observer);
// change state of subject
$newAttributes = array('foo' => 'bar');
$subject->setAttributes($newAttributes);
// observer should now have the same state
$this->assertEquals($newAttributes, $observer->getAttributes());
// add another observer
$observer2 = new TestObserver();
$subject->attachObserver($observer2);
$newAttributes = array('blah' => 'boo');
$subject->setAttributes($newAttributes);
// now both observers should have the new state
$this->assertEquals($newAttributes, $observer->getAttributes());
$this->assertEquals($newAttributes, $observer2->getAttributes());
// remove an observer
$subject->detachObserver($observer);
$newAttributes = array(1, 2, 3);
$subject->setAttributes($newAttributes);
// now only the remaining observer2 should have the new state
$this->assertEquals($newAttributes, $observer2->getAttributes());
$this->assertNotEquals($newAttributes, $observer->getAttributes());
}
