public void TestPrimes()
{
// Test the first 1000 or so primes and not-primes
for (int i = 0, j = 0; j != Math_.Primes.Length; ++i)
{
var is_prime = (i == Math_.Primes[j]);
Assert.True(Math_.IsPrime(i) == is_prime);
if (is_prime)
{
++j;
}
}
// Test some random larger primes
var rng = new Random(123);
for (int i = 0; i != 10000; ++i)
{
var value = rng.Next();
var prime_gtr = Math_.PrimeGtrEq(value);
var prime_lss = Math_.PrimeLessEq(value);
Assert.True(Math_.IsPrime(prime_gtr));
Assert.True(Math_.IsPrime(prime_lss));
if (prime_gtr != prime_lss)
{
Assert.True(Math_.IsPrime(value) == false);
}
else
{
Assert.True(value == prime_gtr);
}
}
// Test some random larger primes
Assert.True(Math_.IsPrime(95413) == true);
Assert.True(Math_.IsPrime(168987071) == false);
Assert.True(Math_.IsPrime(168987079) == true);
Assert.True(Math_.IsPrime(161489287071) == false);
Assert.True(Math_.IsPrime(161489287081) == true);
Assert.True(Math_.IsPrime(341550071728319) == false);
Assert.True(Math_.IsPrime(341550071728631) == true);
}