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]);
        }