public void Test_Create()
{
Packet p = new Packet("foo", doc);
Assert.AreEqual("<foo />", p.ToString());
p.To = "one";
Assert.AreEqual("<foo to=\"one\" />", p.ToString());
p.From = "two";
Assert.AreEqual("<foo to=\"one\" from=\"two\" />", p.ToString());
p.Swap();
Assert.AreEqual("<foo to=\"two\" from=\"one\" />", p.ToString());
}