public void MegamanToString()
        {
            var megaman = new Megaman();

            Assert.AreEqual(
                "Vida: 100, Ataque: 6, Defesa: 0",
                megaman.ToString()
                );
        }
        public void MegamanToStringComMenosDe30DeVida()
        {
            var megaman = new Megaman();

            megaman.ReceberAtaque(71);

            Assert.AreEqual(
                "Vida: 29, Ataque: 6, Defesa: 0",
                megaman.ToString()
                );
        }