public function testRestoreReasonPhraseOfCustomStatusCodeToDefault()
 {
     $statusCode = new StatusCode(599, 'Custom Reason');
     $newStatusCode = $statusCode->restoreReasonPhraseToDefault();
     $this->assertInstanceOf(StatusCode::class, $newStatusCode);
     $this->assertSame('', $newStatusCode->getReasonPhrase());
     $this->assertNotSame($statusCode, $statusCode->restoreReasonPhraseToDefault());
 }