public void TestSeek()
{
using (var stream = new CompressedStream(new DummyNetworkStream())) {
Assert.Throws <NotSupportedException> (() => stream.Seek(0, SeekOrigin.Begin));
Assert.Throws <NotSupportedException> (() => { var x = stream.Position; });
Assert.Throws <NotSupportedException> (() => stream.Position = 500);
}
}