public static void RandomStringTest()
{
const string AllowedChars = "abcd123456789";
var rnd = new Random();
var str = rnd.NextString(AllowedChars, 6);
Equal(6, str.Length);
using (var generator = new RNGCryptoServiceProvider())
{
str = generator.NextString(AllowedChars, 7);
}
Equal(7, str.Length);
}