public async Task AddPhotoForBook_WhenCalled_PhotoIsAddedIntoRepository()
{
var mockFile = new FormFile(new MemoryStream(Encoding.UTF8.GetBytes("Mock file")), 0, 0, "Data", "mock.txt");
var photoForCreationDto = new PhotoForCreationDto {
Description = "description", File = mockFile
};
await _controller.AddPhotoForBook(_book.Id, photoForCreationDto);
_repo.Verify(r => r.SaveAll());
}
