public void Create_Regularly_ShouldHaveHighEntropyInLow5Bytes()
{
var results = new List <ulong>();
for (var i = 0; i < 100; i++)
{
results.Add(RandomSequence6.Create());
}
var sumValuesPerByte = new int[5];
Span <byte> bytes = stackalloc byte[8];
foreach (var result in results)
{
BinaryPrimitives.WriteUInt64BigEndian(bytes, result);
for (var i = 0; i < sumValuesPerByte.Length; i++)
{
sumValuesPerByte[i] += bytes[8 - sumValuesPerByte.Length + i];
}
}
var averageValuesPerByte = new int[sumValuesPerByte.Length];
for (var i = 0; i < sumValuesPerByte.Length; i++)
{
averageValuesPerByte[i] = sumValuesPerByte[i] / results.Count;
}
// Each byte should have an average value close to 127
foreach (var value in averageValuesPerByte)
{
Assert.True(value >= 102 && value <= 152);
}
// The average of the averages should be very close to 127
var totalAverage = averageValuesPerByte.Average();
Assert.True(totalAverage >= 120 && totalAverage <= 134);
}
#pragma warning disable CS0618 // Type or member is obsolete -- Obsolete intended to protect against non-test usage
private static RandomSequence6 SimulateRandomSequenceWithValue(ulong value) => RandomSequence6.CreatedSimulated(value);
public void Create_Regularly_ShouldLeaveHigh16BitsZero()
{
var result = RandomSequence6.Create();
Assert.Equal(0UL, result >> (64 - 16));
}
public void Create_Regularly_ShouldBeNonzero()
{
var result = RandomSequence6.Create();
Assert.NotEqual(0UL, result);
}
