1 files changed, 38 insertions, 0 deletions
diff --git a/source/tests/mersenne_twister_64.test.c b/source/tests/mersenne_twister_64.test.c
new file mode 100644
index 0000000..6bf5b9c
--- /dev/null
+++ b/source/tests/mersenne_twister_64.test.c
@@ -0,0 +1,38 @@
+#include "../kit/mersenne_twister_64.h"
+#include "../kit/secure_random.h"
+
+#define KIT_TEST_FILE mersenne_twister_64
+#include "../kit_test/test.h"
+
+enum { SIZE = 1000 };
+
+TEST("mt64 same seeds") {
+  ptrdiff_t i;
+  uint64_t  seed;
+  secure_random(sizeof seed, &seed);
+
+  mt64_state_t foo, bar;
+  mt64_init(&foo, seed);
+  mt64_init(&bar, seed);
+
+  int ok = 1;
+  for (i = 0; i < SIZE; i++)
+    ok = ok && mt64_generate(&foo) == mt64_generate(&bar);
+
+  REQUIRE(ok);
+}
+
+TEST("mt64 different seeds") {
+  ptrdiff_t i;
+
+  mt64_state_t foo, bar;
+  mt64_init(&foo, 42);
+  mt64_init(&bar, 4242424242);
+
+  ptrdiff_t difference_count = 0;
+  for (i = 0; i < SIZE; i++)
+    if (mt64_generate(&foo) != mt64_generate(&bar))
+      difference_count++;
+
+  REQUIRE(difference_count > SIZE / 2);
+}