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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace whm\Smoke\Rules\Html;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use phm\HttpWebdriverClient\Http\Response\ResourcesAwareResponse;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Psr\Http\Message\ResponseInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use whm\Smoke\Rules\Attribute;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use whm\Smoke\Rules\CheckResult;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use whm\Smoke\Rules\StandardRule;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This rule calculates the size of a html document. If the document is bigger than a given value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * the test will fail.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class BigContentRule extends StandardRule  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $maxSize;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $contentTypes = array('text/html'); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function init($maxSize = 400)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->maxSize = $maxSize;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function doValidation(ResponseInterface $response)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $totalSize = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($response instanceof ResourcesAwareResponse) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($response->getResources() as $resource) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $resourceSize = round($resource['transferSize'] / 1000);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $totalSize += $resourceSize;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($totalSize > $this->maxSize) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $message = 'The total size of the file (and all assets) was ' . $totalSize . ' KB (max: ' . $this->maxSize . ' KB).';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result = new CheckResult(CheckResult::STATUS_FAILURE, $message, $totalSize);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result->addAttribute(new Attribute('resources', $response->getResources(), true)); | 
            
                            
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                            return $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $message = 'The total size of the file (and all assets) was ' . $totalSize . ' KB (max: ' . $this->maxSize . ' KB).';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result = new CheckResult(CheckResult::STATUS_SUCCESS, $message, $totalSize);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result->addAttribute(new Attribute('resources', $response->getResources(), true)); | 
            
                            
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                            return $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: