public void DisconnectSymmetricallyTest()
{
var a = new PathNode();
var b = new PathNode();
a.ConnectSymmetrically(b);
Assert.IsTrue(a.Connections.Contains(b));
Assert.IsTrue(b.Connections.Contains(a));
a.DisconnectSymmetrically(b);
Assert.IsFalse(a.Connections.Contains(b));
Assert.IsFalse(b.Connections.Contains(a));
}