unittestingiformfilethree.cs

public class ImageServiceTests
{
    private readonly IImageService _imageService;
    private readonly int _userId = 1234;
    public ImageServiceTests()
    {
        _imageService = new ImageService();
    }

    [Fact]
    public async Task Service_Saves_Image()
    {
        // Arrange
        var expected = "image saved";

        var imageStream = new MemoryStream(GenerateImageByteArray());
        var image = new FormFile(imageStream, 0, imageStream.Length, "UnitTest", "UnitTest.jpg")
        {
            Headers = new HeaderDictionary(),
            ContentType = "image/jpeg"
        };

        // Act
        var result = await _imageService.SaveImage(_userId, image);

        // Assert
        Assert.Equal(expected, result);
    }

    private byte[] GenerateImageByteArray(int width = 50, int height = 50)
    {
        Bitmap bitmapImage = new Bitmap(width, height);
        Graphics imageData = Graphics.FromImage(bitmapImage);
        imageData.DrawLine(new Pen(Color.Blue), 0, 0, width, height);

        MemoryStream memoryStream = new MemoryStream();
        byte[] byteArray;

        using (memoryStream)
        {
            bitmapImage.Save(memoryStream, ImageFormat.Jpeg);
            byteArray = memoryStream.ToArray();
        }
        return byteArray;
    }
}