unittestingiformfileone.cs

[Route("api/[controller]")]
[ApiController]
public class ImagesController : ControllerBase
{
    private readonly IImageService _imageService;

    public ImagesController(IImageService imageService)
    {
        _imageService = imageService;
    }

    // POST api/images
    [HttpPost]
    public async Task<IActionResult> PostAsync([FromForm] ImageDetailsDto imageDetails)
    {
        var requestImage = Request.Form.Files.FirstOrDefault();

        var result = await _imageService.SaveImage(imageDetails.UserId, requestImage);

        // save user details in some other service

        return Ok(result);
    }
}