public void Default()
        {
            // Arrange
            var spellbook = new Spellbook();

            // Assert
            Assert.AreEqual(3, spellbook.GetWeight());
            Assert.IsFalse(spellbook.GetCasterLevel().HasValue);
            Assert.IsEmpty(spellbook.GetSchools());
            Assert.AreEqual(2, spellbook.GetHardness());
            Assert.AreEqual(1, spellbook.GetHitPoints());
        }