public void GenerateRandomValue_GenerateRandomDataSamples_SamplesAreSpreadRandomly(int min, int max, int meanBucketSize, decimal tolerance)
{
var elemInRange = (long)max - min + 1;
var samples = elemInRange * meanBucketSize;
var lowerBound = (int)(meanBucketSize * (1 - tolerance));
var upperBound = (int)(meanBucketSize * (1 + tolerance));
var buckets = new int[elemInRange];
for (var i = 0; i < samples; ++i)
{
var sample = SecureRandom.GenerateRandomValue(min, max);
var sampleBucketIdx = sample - min;
buckets[sampleBucketIdx] += 1;
}
var sb = new StringBuilder();
var allValuesIsMean = buckets.All(x => x == meanBucketSize);
if (allValuesIsMean)
{
sb.AppendLine("All bucket are equal");
}
else
{
for (var i = 0; i < buckets.Length; ++i)
{
if (buckets[i] < lowerBound || buckets[i] > upperBound)
{
sb.AppendLine($"Bucket for value {i + min} contained {buckets[i]} samples which is outside the range [{lowerBound}, {upperBound}]");
}
}
}
if (sb.Length > 0)
{
Assert.Fail(sb.ToString());
}
}
public void GenerateRandomValue_MaxIsLessOrEqualToMin_ThrowsArgumentException(int min, int max)
{
var ex = Assert.Throws <ArgumentException>(() => SecureRandom.GenerateRandomValue(min, max));
Assert.That(ex.ParamName, Is.EqualTo("max"), nameof(ex.ParamName));
}
public void GenerateRandomValue_MaxIsGreaterThanMin_DoesNotThrow(int min, int max)
{
var actual = SecureRandom.GenerateRandomValue(min, max);
Assert.That(actual, Is.GreaterThanOrEqualTo(min).And.LessThanOrEqualTo(max));
}
///<summary>Retruns a random int within range.Including max number.</summary> public static int getRandomUnsignedIntFromRange(int min, int max) => SecureRandom.GenerateRandomValue(min, max);
