public void Encode_PreserveRatio <TPixel>(TestImageProvider <TPixel> provider, WebpFileFormatType expectedFormat)
where TPixel : unmanaged, IPixel <TPixel>
{
var options = new WebpEncoder();
using Image <TPixel> input = provider.GetImage();
using var memoryStream = new MemoryStream();
input.Save(memoryStream, options);
memoryStream.Position = 0;
using var output = Image.Load <Rgba32>(memoryStream);
ImageMetadata meta = output.Metadata;
WebpMetadata webpMetaData = meta.GetWebpMetadata();
Assert.Equal(expectedFormat, webpMetaData.FileFormat);
}