Wyjątek w unit test przez automapper

Cześć.
Próbuje napisać unit testa który testuje metodę Create (asp-core). Podczas wykonywania leci wyjątek, nie wiem czemu Automapper nie zaskakuje w unit teście, tą samą konfiguracje mam w aplikacji i działa.

Missing type map configuration or unsupported mapping.

Mapping types:
Note -> NoteDto
ToDoWebApi.Models.Note -> ToDoWebApi.Models.NoteDto

Unit Test

[Fact]
        public void AddToDo()
        {
            Mapper.Initialize(cfg => cfg.CreateMap<Note, NoteDto>());
            Mapper.Initialize(cfg => cfg.CreateMap<NoteDto, Note>());

            var mockDb = new Mock<ApplicationDbContext>();
            mockDb.Setup(m => m.Notes.Add(It.IsAny<Note>()));
            mockDb.Setup(m => m.SaveChanges()).Returns(1);

            var repo = new ToDoRepository(mockDb.Object);

            NoteDto noteDto = new NoteDto()
            {
                Text = "Text 1",
                Title = "Title 1"
            };
            var note = repo.Create(noteDto);
            if (note == null)
            {
                throw new System.Exception("Note cannot be null");
            }
            var noteDtoReturned = Mapper.Map<Note,NoteDto>(note);

            mockDb.Verify(m => m.Add(It.IsAny<Note>()), Times.Once());
            mockDb.Verify(m => m.SaveChanges(), Times.Once());
            Assert.Equal<NoteDto>(noteDto, noteDtoReturned);
        }

 
public class ToDoRepository : IToDoRepository
    {

        private readonly ApplicationDbContext _db;
        public ToDoRepository(ApplicationDbContext db)
        {
            _db = db;
        }

        public Note Create(NoteDto noteDto)
        {
            Note note = Mapper.Map<Note>(noteDto);//powoduje wyjątek
            try
            {
                _db.Notes.Add(note);
                var result = _db.SaveChanges();
                if (result > 0)
                {
                    return note;
                }
            }
            catch (Exception)
            { }
            return null;
        }
       [...]
}

    public class Note
    {
        [Key]
        public Guid Id { get; set; }

        [MinLength(1)]
        [MaxLength(64)]
        public string Title { get; set; }

        [MinLength(1)]
        [MaxLength(1024)]
        public string Text { get; set; }
    }

    public class NoteDto
    {
        public string Title { get; set; }

        public string Text { get; set; }
    }