public void AverageWeightTest() { f1.Add(f2); f1.Add(bearAviary); f2.Add(giraffeAviary); f2.Add(wolfAviary); zoo.AddField(f1); zoo.AddAnimal("Some Animal 1", 1); zoo.AddAnimal("Some Animal 2", 3); Assert.AreEqual(zoo.AverageWeight(), 2); }