/// <summary>
/// Generate random digit code
/// </summary>
/// <param name="length">Length</param>
/// <returns>Result string</returns>
public static string GenerateRandomDigitCode(int length)
{
using var random = new SecureRandomNumberGenerator();
var str = string.Empty;
for (var i = 0; i < length; i++)
{
str = string.Concat(str, random.Next(10).ToString());
}
return(str);
}
public void NextDouble_ReturnsValuesBetween0And1()
{
// Arrange
var randomValues = new double[Iterations];
var rng = new SecureRandomNumberGenerator();
// Action
for (var i = 0; i < Iterations; i++)
{
randomValues[i] = rng.NextDouble();
}
// Assert
Assert.IsTrue(randomValues.All(x => x >= 0 && x < 1));
}
public void NextInt_TwoArguments_ReturnsEquallyDistributedValues()
{
// Arrange
var randomValues = new long[Iterations];
var rng = new SecureRandomNumberGenerator();
const int AcceptedDeviation = 240;
// Action
for (var i = 0; i < Iterations; i++)
{
randomValues[i] = rng.NextInt(1_200, 3_600);
}
// Assert
Assert.IsTrue(randomValues.Sum() / Iterations > 2_400 - AcceptedDeviation);
Assert.IsTrue(randomValues.Sum() / Iterations < 2_400 + AcceptedDeviation);
}
public void NextDouble_ReturnsEquallyDistributedValues()
{
// Arrange
var randomValues = new double[Iterations];
var rng = new SecureRandomNumberGenerator();
const int AcceptedDeviation = 1000;
// Action
for (var i = 0; i < Iterations; i++)
{
randomValues[i] = rng.NextDouble();
}
// Assert
Assert.IsTrue(randomValues.Sum() > Iterations / 2 - AcceptedDeviation);
Assert.IsTrue(randomValues.Sum() < Iterations / 2 + AcceptedDeviation);
}
// public DbHostServerPort MasterDatabaseHost { get; set; } = new DbHostServerPort();
// public IList<DbHostServerPort> SlaveDatabaseHost { get; set; } = new List<DbHostServerPort>();
public string GetSecureRandomReadDataConnectionString()
{
if (ReadDataConnectionString == null ||
!ReadDataConnectionString.Any())
{
return(MasterDataConnectionString);
}
else
{
if (ReadDataConnectionString.Count == 1)
{
return(ReadDataConnectionString[0]);
}
else
{
var index = SecureRandomNumberGenerator.GetInt32(0,
ReadDataConnectionString.Count);
return(ReadDataConnectionString[index]);
}
}
}
public void NextInt_NoArgument_ReturnsEquallyDistributedValues()
{
// Arrange
var bitEquals1Counters = new int[31]; // to 31 because first bit indicates +-
var rng = new SecureRandomNumberGenerator();
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));
}
/// <summary>
/// Returns an random integer number within a specified rage
/// </summary>
/// <param name="min">Minimum number</param>
/// <param name="max">Maximum number</param>
/// <returns>Result</returns>
public static int GenerateRandomInteger(int min = 0, int max = int.MaxValue)
{
using var random = new SecureRandomNumberGenerator();
return(random.Next(min, max));
}