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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * File containing the RequestListenerTest class.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright Copyright (C) eZ Systems AS. All rights reserved.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license For full copyright and license information view LICENSE file distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @version //autogentag//  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace eZ\Bundle\EzPublishRestBundle\Tests\EventListener;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use eZ\Publish\Core\REST\Server\View\AcceptHeaderVisitorDispatcher;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpFoundation\Request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpKernel\Event\GetResponseEvent;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpKernel\HttpKernelInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use eZ\Bundle\EzPublishRestBundle\EventListener\RequestListener;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\HttpKernel\KernelEvents;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class RequestListenerTest extends EventListenerTest  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    const REST_PREFIX = '/rest/prefix';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function provideExpectedSubscribedEventTypes()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            array(array(KernelEvents::REQUEST)),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testOnKernelRequestNotMasterRequest()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $event = $this->getEvent(self::REST_PREFIX . '/', HttpKernelInterface::SUB_REQUEST);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getEventListener()->onKernelRequest($event);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertTrue(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $event->getRequest()->attributes->get('is_rest_request') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                View Code Duplication | 
                    public function testOnKernelRequestNotRestRequest()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $event = $this->getEvent('/'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getEventListener()->onKernelRequest($event);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertFalse(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $event->getRequest()->attributes->get('is_rest_request') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                View Code Duplication | 
                    public function testOnKernelRequestRestRequest()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $event = $this->getEvent(self::REST_PREFIX . '/');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getEventListener()->onKernelRequest($event);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertTrue(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $event->getRequest()->attributes->get('is_rest_request') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return RequestListener  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getEventListener()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return new RequestListener(  | 
            
                            
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                            self::REST_PREFIX,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->getVisitorDispatcherMock()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return AcceptHeaderVisitorDispatcher|\PHPUnit_Framework_MockObject_MockObject  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getVisitorDispatcherMock()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getMock(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'eZ\Publish\Core\REST\Server\View\AcceptHeaderVisitorDispatcher'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return GetResponseEvent  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function getEvent($uri, $type = HttpKernelInterface::MASTER_REQUEST)  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        return new GetResponseEvent(  | 
            
            
                                                        
            
                                    
            
            
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                            $this->getMock('Symfony\Component\HttpKernel\HttpKernelInterface'), | 
            
            
                                                        
            
                                    
            
            
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                            Request::create($uri),  | 
            
            
                                                        
            
                                    
            
            
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                            $type  | 
            
            
                                                        
            
                                    
            
            
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                        );  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.