Fix tests and improve code coverate

src/Entities/Traits/ClientTrait.php

@@ -12,6 +12,7 @@ trait ClientTrait
      * Get the client's name.
      *
      * @return string
+     * @codeCoverageIgnore
      */
     public function getName()
     {

src/Exception/OAuthServerException.php

@@ -119,6 +119,8 @@ class OAuthServerException extends \Exception
      * @param $hint
      *
      * @return static
+     *
+     * @codeCoverageIgnore
      */
     public static function serverError($hint)
     {

src/Grant/AuthCodeGrant.php

@@ -234,6 +234,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
                     ]
                 )
             );
+            $redirectPayload['state'] = $authorizationRequest->getState();
 
             $response = new RedirectResponse();
             $response->setRedirectUri(

src/RequestEvent.php

@@ -26,6 +26,7 @@ class RequestEvent extends Event
 
     /**
      * @return ServerRequestInterface
+     * @codeCoverageIgnore
      */
     public function getRequest()
     {