public async Task <IActionResult> PersistUserTestResult(SaveUserTestResult command) =>
 (await Mediator.Send(command))
 .Match(_ => Ok(), Error);
 public UserTestResult(SaveUserTestResult command)
 {
     UserIdentifier    = command.UserIdentifier;
     ResultStatistics  = command.TestStats;
     AnswersCollection = command.TestAnswers;
 }