public void DeleteByIdTest()
{
// Arrange
unitOfWork.ResetCalls();
// Act
enrollmentService.DeleteById(It.IsAny <int>());
// Assert
enrollmentRepository.Verify(x => x.Delete(It.IsAny <int>()), Times.Once(), "Should delete once");
unitOfWork.Verify(x => x.Save(), Times.Once(), "Should save once");
}