以下是PHPunit.de网站的示例(第9章)：

public function testObserversAreUpdated()
{
    // Create a mock for the Observer class,// only mock the update() method.
    $observer = $this->getMockBuilder('Observer')
                     ->setMethods(array('update'))
                     ->getMock();

    // 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('My 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();
}

如果API返回了某些内容,那么您可以将will()添加到第二个语句,如下所示：

->will($this->returnValue(TRUE));