<?php
require_once 'PHPUnit2/Extensions/ExceptionTestCase.php';
 
class ObserverTest extends PHPUnit2_Framework_TestCase
{
    public function testUpdateIsCalledOnce()
    {
        // Create a Mock Object for the Observer class
        // mocking only the update() method.
        $observer = $this->getMock('Observer', array('update'));
 
        // Set up the expectation for the update() method
        // to be called only once and with the string 'something'
        // as its parameter.
        $observer->expects($this->once())
                 ->method('update')
                 ->with($this->equalTo('something')
        );
 
        // Create a Subject object and attach the mocked
        // Observer object to it.
        $subject = new Subject;
        $subject->attach($observer);
 
        // Call the doSomething() method on the $subject object
        // which we expect to call the mocked Observer object's
        // update() method with the string 'something'.
        $subject->doSomething();
    }
}
?>