public void GenerateRandomData_GenerateRandomDataSamples_SamplesAreSpreadRandomly()
{
var samples = 256 * 256 * 256;
var tolerance = 0.02;
var meanBucketSize = (samples / 256);
var lowerBound = (int)(meanBucketSize * (1 - tolerance));
var upperBound = (int)(meanBucketSize * (1 + tolerance));
var buckets = new int[256];
for (var i = 0; i < samples; ++i)
{
var randomData = SecureRandom.GenerateRandomData(1);
buckets[randomData[0]] += 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} contained {buckets[i]} samples which is outside the range [{lowerBound}, {upperBound}]");
}
}
}
if (sb.Length > 0)
{
Assert.Fail(sb.ToString());
}
}
public void GenerateRandomData_SizeIsLessThanOne_ThrowsArgumentOutOfRangeException(int size)
{
var ex = Assert.Throws <ArgumentOutOfRangeException>(() => SecureRandom.GenerateRandomData(size));
Assert.That(ex.ParamName, Is.EqualTo("size"), nameof(ex.ParamName));
}
public void GenerateRandomData_Size_ReturnAnArrayWithLengthEqualToSize(int size)
{
var actual = SecureRandom.GenerateRandomData(size);
Assert.That(actual.Length, Is.EqualTo(size));
}
