public void TestRandomNumberGenerator()
{
//Since it's impossible to deterministically test generating a random number, we aren't going to do that.
//We can, however, test a bunch of iterations to verify that the number is within the acceptable range.
for (int i = 0; i < 100000; i++)
{
var randomInt = RandomNumberUtils.GetRandomInt(0, 51);
Assert.IsTrue(randomInt >= 0);
Assert.IsTrue(randomInt <= 51);
}
}
/// <summary>
/// Shuffles an arbitrary deck of cards
/// </summary>
/// <param name="listToShuffle">The list of cards to shuffle</param>
/// <returns>A shuffled list of cards</returns>
public static List <Card> ShuffleCards(List <Card> listToShuffle)
{
//Null check
if (listToShuffle == null || !listToShuffle.Any())
{
throw new ArgumentNullException("Please pass in a valid deck!");
}
//Basic idea here is that if we run through the deck and randomly swap each card with another card,
//and repeat the process to increase randomness, we can shuffle the deck to an acceptable level of randomness
//Adding the ability to run through the deck in multiple iterations allows for extra randomness
for (int iteration = 0; iteration < 5000; iteration++)
{
//Here we're looping through each card in the deck and randomly swapping it with another card. Note that
//swapping a card with itself is statistically valid.
for (int i = 0; i < listToShuffle.Count; i++)
{
listToShuffle.Swap(i, RandomNumberUtils.GetRandomInt(0, listToShuffle.Count - 1));
}
}
return(listToShuffle);
}
