public void TestAddAndReducehouse()
        {
            Residential r = new Residential();
            Player      p = new Player("Tom", 1000);

            r.setOwner(ref p);
            r.addHouse();
            Assert.AreEqual(1, r.getHouseCount());
            r.reduceHouse();
            Assert.AreEqual(0, r.getHouseCount());
        }