public function testCanReplaceOriginalResponseAndBodySizeAfterConstruction()
 {
     $psrResponse = new PsrResponse();
     $originalResponse = new Response(new PsrResponse());
     $originalResponse->write('foo');
     $final = new FinalHandler([], $psrResponse);
     $final->setOriginalResponse($originalResponse);
     /** @var Response $actualResponse */
     $actualResponse = self::readAttribute($final, 'response');
     $this->assertSame($originalResponse, $actualResponse);
     $this->assertSame(3, $actualResponse->getBody()->getSize());
 }