public async Task <OperationResult <Unit> > AddUserAnswers(int testId, SendTestAnswersDto dto)
{
int userId = userContext.UserId;
List <UserAnswer> answers = dto.Answers
.Select(x => testMapper.MapToUserAnswer(x, testId, userId))
.ToList();
if (answers.Count == 0)
{
return(new BadRequestError());
}
return(await testService.AddUserAnswers(testId, answers));
}