public void GetRollType_ValidatePossibilities()
{
var diceRoller = new DiceRoller(numberGenerator);
Assert.AreEqual(RollType.normalRoll, diceRoller.GetRollType("d20 + 4"));
Assert.AreEqual(RollType.withAdvantage, diceRoller.GetRollType("d20 + 4 adv"));
Assert.AreEqual(RollType.withAdvantage, diceRoller.GetRollType("d20 + 4 /adv"));
Assert.AreEqual(RollType.withAdvantage, diceRoller.GetRollType("d20 + 4 with advantage"));
Assert.AreEqual(RollType.withDisadvantage, diceRoller.GetRollType("d20 + 4 dis"));
Assert.AreEqual(RollType.withDisadvantage, diceRoller.GetRollType("d20 + 4 /dis"));
Assert.AreEqual(RollType.withDisadvantage, diceRoller.GetRollType("d20 + 4 with disadvantage"));
Assert.AreEqual(RollType.showUsage, diceRoller.GetRollType("/?"));
Assert.AreEqual(RollType.showUsage, diceRoller.GetRollType("-?"));
Assert.AreEqual(RollType.showUsage, diceRoller.GetRollType("help"));
}