public void SpendManaMethod_AppropriatelyAltersCurrentMana()
{
const int manaSpent = FighterMana - 1;
var ret = _fighter.SpendMana(manaSpent);
Assert.AreEqual(1, _fighter.CurrentMana);
Assert.AreEqual(FighterMana, _fighter.MaxMana);
Assert.AreEqual(manaSpent, ret);
}