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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace NuvoleWeb\Drupal\DrupalExtension\Context;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Drupal\menu_link_content\Entity\MenuLinkContent;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Drupal\system\Entity\Menu;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Behat\Gherkin\Node\TableNode;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Behat\Behat\Hook\Scope\AfterScenarioScope;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Behat\Mink\Exception\ExpectationException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class MenuContext.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package NuvoleWeb\Drupal\DrupalExtension\Context  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class MenuContext extends RawDrupalContext { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * Menu links created during test execution.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @var \Drupal\menu_link_content\Entity\MenuLinkContent[]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  private $menuLinks = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * Create menu structure for nodes.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @param string $menu_name  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *    Menu machine name.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @param \Behat\Gherkin\Node\TableNode $table  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *    Table representing the menu structure to be specified as follows:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *      | title  | parent |  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *      | Page 1 |        |  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *      | Page 2 | Page 1 |  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *      | Page 3 | Page 2 |.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @throws \Behat\Mink\Exception\ExpectationException  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *    Throws exception if menu not found.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @Given the following :menu_name menu structure for content:  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                   */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                  public function assertMenuStructureForContent($menu_name, TableNode $table) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    $menu_items = $table->getColumnsHash();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    foreach ($menu_items as $key => $menu_item) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                      $node = $this->getCore()->loadNodeByName($menu_item['title']);  | 
            
                            
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                      $menu_items[$key]['uri'] = "entity:node/{$this->getCore()->getNodeId($node)}"; | 
            
                            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    try { | 
            
            
                                                                        
                            
            
                                    
            
            
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                      $this->menuLinks = array_merge($this->menuLinks, $this->getCore()->createMenuStructure($menu_name, $menu_items));  | 
            
                            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    catch (\InvalidArgumentException $e) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                      throw new ExpectationException($e->getMessage(), $this->getSession());  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                  }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * Create menu structure my adding menu links.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @param string $menu_name  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *    Menu machine name.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @param \Behat\Gherkin\Node\TableNode $table  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *    Table representing the menu structure to be specified as follows:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *       | title   | uri        | parent |  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *       | Link 1  | internal:/ |        |  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *       | Link 2  | internal:/ | Link 1 |  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *       | Link 3  | internal:/ | Link 1 |.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @throws \Behat\Mink\Exception\ExpectationException  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *    Throws exception if menu not found.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @Given the following :menu_name menu structure:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  public function assertMenuStructure($menu_name, TableNode $table) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    try { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      $this->menuLinks = array_merge($this->menuLinks, $this->getCore()->createMenuStructure($menu_name, $table->getColumnsHash()));  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    catch (\InvalidArgumentException $e) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      throw new ExpectationException($e->getMessage(), $this->getSession());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * Assert clean Watchdog after every step.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @param \Behat\Behat\Hook\Scope\AfterScenarioScope $event  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *    Event object.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   * @AfterScenario  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                   */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  public function deleteMenuLinks(AfterScenarioScope $event) { | 
            
                            
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                    if ($this->menuLinks) { | 
            
                            
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                      foreach ($this->menuLinks as $menu_link) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getCore()->entityDelete($menu_link);  | 
            
                            
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                      }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      $this->getCore()->clearMenuCache();  | 
            
                            
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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: