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

            directory.Set(PngDirectory.TagCompressionType, 0);
            Assert.Equal("Deflate", descriptor.GetCompressionTypeDescription());
            Assert.Equal("Deflate", directory.GetDescription(PngDirectory.TagCompressionType));
        }