public void GenerateOneMillionString_WithRngProvider_ShouldBeUnique()
{
const int count = 1000000;
var holder = new string[count];
var rnd = new Random();
using var rngProvider = new RNGCryptoServiceProvider();
for (var i = 0; i < count; i++)
{
holder[i] = rngProvider.GetString(rnd.Next(10, 30));
}
holder.Should().NotBeEmpty().And.NotContainNulls().And.HaveCount(count).And.OnlyHaveUniqueItems();
}