Rename "test" directory to "t".

[cdecl99.git] / t / rng-test.c

diff --git a/t/rng-test.c b/t/rng-test.c
new file mode 100644 (file)
index 0000000..3f4cf32
--- /dev/null
+++ b/t/rng-test.c
@@ -0,0 +1,80 @@
+/*
+ * Simple random number generator for testing.
+ * Copyright © 2022 Nick Bowler
+ *
+ * Directly compare the test lib RNG against the reference implementation.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdlib.h>
+
+#include "rng.c"
+#include "xos256p.c"
+
+int main(void)
+{
+       unsigned long long seed_state = 0xdeadbeeff00dcafe;
+       unsigned long long test_result, ref_result;
+       unsigned long long ref_state[4], test_state[4];
+       int i, ret = 0;
+
+       printf("1..200\n");
+       for (i = 0; i < 100; i++) {
+               s[0] = ref_state[0] = test_state[0] = splitmix64(&seed_state);
+               s[1] = ref_state[1] = test_state[1] = splitmix64(&seed_state);
+               s[2] = ref_state[2] = test_state[2] = splitmix64(&seed_state);
+               s[3] = ref_state[3] = test_state[3] = splitmix64(&seed_state);
+
+               ref_result = next();
+               test_result = xoshiro256p(test_state);
+
+               if (ref_result != test_result) {
+                       printf("not ok %d rng output\n", 2*i+1);
+                       printf("# Failed, unexpected result\n");
+                       printf("#   with initial state %llx %llx %llx %llx\n",
+                              ref_state[0], ref_state[1],
+                              ref_state[2], ref_state[3]);
+                       printf("#   received: %llx\n", test_result);
+                       printf("#   expected: %llx\n", ref_result);
+                       ret = EXIT_FAILURE;
+               } else {
+                       printf("ok %d rng output\n", 2*i+1);
+               }
+
+               if (s[0] != test_state[0] || s[1] != test_state[1]
+                   || s[2] != test_state[2] || s[3] != test_state[3])
+               {
+                       printf("not ok %d rng state update\n", 2*i+2);
+                       printf("# Failed, state update differed\n");
+                       printf("#   with initial state %llx %llx %llx %llx\n",
+                              ref_state[0], ref_state[1],
+                              ref_state[2], ref_state[3]);
+                       printf("#   received: %llx %llx %llx %llx\n",
+                              test_state[0], test_state[1],
+                              test_state[2], test_state[3]);
+                       printf("#   expected: %llx %llx %llx %llx\n",
+                              (unsigned long long)s[0],
+                              (unsigned long long)s[1],
+                              (unsigned long long)s[2],
+                              (unsigned long long)s[3]);
+                       ret = EXIT_FAILURE;
+               } else {
+                       printf("ok %d rng state update\n", 2*i+2);
+               }
+       }
+
+       return ret;
+}