public void GetExamById_ShouldThrowExamNotFoundException()
{
// Arrange
Guid mockGuid = new Guid();
_mockReadRepository.Setup(repo => repo.GetByIdAsync <Domain.Entities.Exam>(mockGuid)).Throws(new ExamNotFoundException(mockGuid));
// Act
Func <Task> act = async() => await _examService.GetById(mockGuid);
// Assert
act.Should().Throw <ExamNotFoundException>();
}