public void TakeRandom_IEnumerable_Uniformity(int trialsQty, int toSelectQty, int elementsQty, int inRangeQty)
{
// Arrange
int expectedCount = trialsQty / (elementsQty / toSelectQty);
var timesChosen = new int[elementsQty];
var randomSelector = new RandomSelector();
// Act
for (var trial = 0; trial < trialsQty; trial++)
{
foreach (var selected in randomSelector.TakeRandom(Range(0, elementsQty), toSelectQty, timesChosen.Length))
{
timesChosen[selected]++;
}
}
var avg = timesChosen.Average();
var max = timesChosen.Max();
var min = timesChosen.Min();
var allowedDifference = expectedCount / elementsQty;
var countInRange = timesChosen.Count(i => i >= expectedCount - allowedDifference && i <= expectedCount + allowedDifference);
// Assert
AssertBetween(avg, expectedCount - 2, expectedCount + 2, "Average");
Assert.True(countInRange >= inRangeQty, string.Format("Not enough were in range: {0}", countInRange));
}
