public void ChangePosition()
{
var buffTest = new byte[2] {
2, 3
};
Stream msTest = new MemoryStream(buffTest);
streamControl.SeleсtStream("one");
streamControl.Position = 1;
byte[] buf = new byte[2];
streamControl.ControlledStream.Read(buf, 0, 2);
Assert.AreEqual(buffTest[0], buf[0]);
}