public void SetLength()
{
var s = new ReusableStream(16);
Assert.AreEqual(0, s.Length);
Assert.AreEqual(0, s.UnreadByteCount);
Assert.AreEqual(16, s.Capacity);
s.SetLength(4);
Assert.AreEqual(4, s.Length);
Assert.AreEqual(4, s.UnreadByteCount);
Assert.AreEqual(16, s.Capacity);
s.ReadInt32();
Assert.AreEqual(4, s.Length);
Assert.AreEqual(0, s.UnreadByteCount);
Assert.AreEqual(16, s.Capacity);
s.SetLength(16);
Assert.AreEqual(16, s.Length);
Assert.AreEqual(12, s.UnreadByteCount);
Assert.AreEqual(16, s.Capacity);
s.SetLength(17);
Assert.AreEqual(17, s.Length);
Assert.AreEqual(13, s.UnreadByteCount);
Assert.IsTrue(s.Capacity >= 17);
s.SetLength(0);
Assert.AreEqual(0, s.Length);
Assert.AreEqual(0, s.UnreadByteCount);
Assert.IsTrue(s.Capacity >= 17);
Assert.Throws <ArgumentOutOfRangeException>(() => s.SetLength(-1));
}
