From 243d191aafdec9e11edea857f93b8ca6c6c7d318 Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Sat, 17 Dec 2022 22:50:24 +0100
Subject: secure random

---
 source/test/unittests/CMakeLists.txt       |  4 ++--
 source/test/unittests/secure_random.test.c | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 source/test/unittests/secure_random.test.c

(limited to 'source/test/unittests')

diff --git a/source/test/unittests/CMakeLists.txt b/source/test/unittests/CMakeLists.txt
index 261b69e..b2ef480 100644
--- a/source/test/unittests/CMakeLists.txt
+++ b/source/test/unittests/CMakeLists.txt
@@ -4,5 +4,5 @@ target_sources(
       async_function.test.c bigint.test.c mutex.test.c
       test_duration.test.c main.test.c string_ref.test.c atomic.test.c thread.test.c
       array_ref.test.c input_stream.test.c lower_bound.test.c
-      condition_variable.test.c mersenne_twister_64.test.c input_buffer.test.c
-      move_back.test.c dynamic_array.test.c file.test.c)
+      secure_random.test.c condition_variable.test.c mersenne_twister_64.test.c
+      input_buffer.test.c move_back.test.c dynamic_array.test.c file.test.c)
diff --git a/source/test/unittests/secure_random.test.c b/source/test/unittests/secure_random.test.c
new file mode 100644
index 0000000..ec0a7b2
--- /dev/null
+++ b/source/test/unittests/secure_random.test.c
@@ -0,0 +1,22 @@
+#include "../../kit/secure_random.h"
+#include <string.h>
+
+#define KIT_TEST_FILE secure_random
+#include "../../kit_test/test.h"
+
+TEST("secure random") {
+  int v[20];
+  memset(v, 0, sizeof v);
+
+  secure_random(40, v);
+  secure_random(40, v + 10);
+
+  int repeats = 0;
+
+  for (int i = 1; i < sizeof v / sizeof *v; i++)
+    for (int j = 0; j < i; j++)
+      if (v[i] == v[j])
+        repeats++;
+
+  REQUIRE(repeats == 0);
+}
-- 
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