1 files changed, 47 insertions, 0 deletions
diff --git a/test/math/primeSieve.cpp b/test/math/primeSieve.cpp
new file mode 100644
index 0000000..78a50d2
--- /dev/null
+++ b/test/math/primeSieve.cpp
@@ -0,0 +1,47 @@
+#include "../util.h"
+#include <math/primeSieve.cpp>
+
+bool naive(ll x) {
+	for (ll i = 2; i*i <= x; i++) {
+		if (x % i == 0) return false;
+	}
+	return x > 1;
+}
+
+void stress_test() {
+	int queries = 0;
+	vector<ll> found;
+	for (int i = -5; i < 1'000'000; i++) {
+		auto got = isPrime(i);
+		auto expected = naive(i);
+		if (got != expected) cerr << "error: " << i << FAIL;
+		if (got) found.push_back(i);
+		queries++;
+	}
+	primes.resize(sz(found));
+	if (primes != found) cerr << "error: primes" << FAIL;
+	for (int i = 0; i < 1'000'000; i++) {
+		ll x = Random::integer<ll>(2, N);
+		auto got = isPrime(x);
+		auto expected = naive(x);
+		if (got != expected) cerr << "error: " << x << FAIL;
+		queries++;
+	}
+	cerr << "tested queries: " << queries << endl;
+}
+
+void performance_test() {
+	timer t;
+	t.start();
+	primeSieve();
+	hash_t hash = sz(primes);
+	t.stop();
+	if (t.time > 500) cerr << "too slow: " << t.time << FAIL;
+	cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
+}
+
+int main() {
+	performance_test();
+	stress_test();
+}
+