public void ContainsRaceTest()
{
var d = new Demographics();
Assert.AreEqual(0, d.Populations.Count);
var r = MakeTestRace("test race");
var r2 = MakeTestRace("test race 2");
Assert.IsFalse(d.ContainsRace(r));
Assert.IsFalse(d.ContainsRace(r2));
d.IncreasePopulationFor(r);
Assert.IsTrue(d.ContainsRace(r));
Assert.IsFalse(d.ContainsRace(r2));
d.IncreasePopulationFor(r2);
Assert.IsTrue(d.ContainsRace(r));
Assert.IsTrue(d.ContainsRace(r2));
}