public void AddAndCount()
{
g.Add(b1);
Assert.AreEqual(++size, g.CountBuildings());
g.Add(b2);
Assert.AreEqual(++size, g.CountBuildings());
g.Add(b3);
Assert.AreEqual(++size, g.CountBuildings());
// Adding same fromBuilding twice should be ignored
Assert.Throws <ArgumentException>(delegate { g.Add(b1); });
Assert.AreEqual(size, g.CountBuildings());
}
