public void rewind()
{
Assert.Throws <ArgumentNullException>(() => StreamExtensions.Rewind <Stream>(null));
Assert.True(ReferenceEquals(Stream.Null.Rewind(), Stream.Null));
var bytes = Guid.NewGuid().ToByteArray();
var stream = new MemoryStream(bytes);
Assert.Equal(0, stream.Position);
stream.Seek(0, SeekOrigin.End);
Assert.Equal(stream.Length, stream.Position);
stream.Rewind();
Assert.Equal(0, stream.Position);
stream.Rewind();
Assert.Equal(0, stream.Position);
}
