public void NextInt_NoArgumentWithSeed_ReturnsAlwaysTheSameValue()
{
// Arrange
var randomValues = new int[Iterations];
var seed = new System.Random().Next();
// Action
for (var i = 0; i < Iterations; i++)
{
var rng = new DefaultRandomNumberGenerator(seed);
randomValues[i] = rng.NextInt();
var a = randomValues[i];
Console.WriteLine(randomValues[i]);
}
// Assert
Assert.IsTrue(randomValues.All(x => x == randomValues[0]));
}
public void NextInt_NoArgumentWithoutSeed_ReturnsEquallyDistributedValues()
{
// Arrange
var bitEquals1Counters = new int[31]; // to 31 because first bit indicates +-
var rng = new DefaultRandomNumberGenerator();
const int AcceptedDeviation = Iterations / 100;
// Action
for (var i = 0; i < Iterations; i++)
{
var value = rng.NextInt();
for (var j = 0; j < 31; j++)
{
if ((value & (1 << j)) == (1 << j))
{
bitEquals1Counters[j]++;
}
}
}
// Assert
Assert.IsTrue(bitEquals1Counters.All(x => x >= Iterations / 2 - AcceptedDeviation));
Assert.IsTrue(bitEquals1Counters.All(x => x <= Iterations / 2 + AcceptedDeviation));
}
