def test_get_number(self):
inventory = Inventory()
obj1 = Object('Test1')
obj2 = Object('Test2')
obj3 = Object('Test3')
self.assertEquals(inventory.get_number(), 0)
inventory.add(obj1)
self.assertEquals(inventory.get_number(), 1)
inventory.add(obj2)
self.assertEquals(inventory.get_number(), 2)
inventory.add(obj3)
self.assertEquals(inventory.get_number(), 3)
