public void GetFilterMethodDescription()
        {
            PngDirectory  directory  = new PngDirectory(PngChunkType.IHDR);
            PngDescriptor descriptor = new PngDescriptor(directory);

            directory.Set(PngDirectory.TagFilterMethod, 0);
            Assert.Equal("Adaptive", descriptor.GetFilterMethodDescription());
            Assert.Equal("Adaptive", directory.GetDescription(PngDirectory.TagFilterMethod));
        }