tests: add test-random-util

In case you're wondering: 16 aligns in a nice pyramid.

.gitignore

@@ -267,6 +267,7 @@
 /test-process-util
 /test-pty
 /test-qcow2
+/test-random-util
 /test-ratelimit
 /test-replace-var
 /test-resolve

Makefile.am

@@ -1624,6 +1624,7 @@ tests += \
 	test-conf-parser \
 	test-capability \
 	test-async \
+	test-random-util \
 	test-ratelimit \
 	test-condition \
 	test-uid-range \
@@ -1945,6 +1946,12 @@ test_fstab_util_SOURCES = \
 test_fstab_util_LDADD = \
 	libsystemd-shared.la
 
+test_random_util_SOURCES = \
+	src/test/test-random-util.c
+
+test_random_util_LDADD = \
+	libsystemd-shared.la
+
 test_ratelimit_SOURCES = \
 	src/test/test-ratelimit.c
 

src/test/meson.build

@@ -161,6 +161,10 @@ tests += [
          [],
          []],
 
+        [['src/test/test-random-util.c'],
+         [],
+         []],
+
         [['src/test/test-ratelimit.c'],
          [],
          []],

src/test/test-random-util.c

@@ -0,0 +1,65 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2017 Zbigniew Jędrzejewski-Szmek
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "hexdecoct.h"
+#include "random-util.h"
+#include "log.h"
+
+static void test_acquire_random_bytes(bool high_quality_required) {
+        uint8_t buf[16] = {};
+        unsigned i;
+
+        log_info("/* %s */", __func__);
+
+        for (i = 1; i < sizeof buf; i++) {
+                assert_se(acquire_random_bytes(buf, i, high_quality_required) == 0);
+                if (i + 1 < sizeof buf)
+                        assert_se(buf[i] == 0);
+
+                hexdump(stdout, buf, i);
+        }
+}
+
+static void test_pseudorandom_bytes(void) {
+        uint8_t buf[16] = {};
+        unsigned i;
+
+        log_info("/* %s */", __func__);
+
+        for (i = 1; i < sizeof buf; i++) {
+                pseudorandom_bytes(buf, i);
+                if (i + 1 < sizeof buf)
+                        assert_se(buf[i] == 0);
+
+                hexdump(stdout, buf, i);
+        }
+}
+
+int main(int argc, char **argv) {
+        log_set_max_level(LOG_DEBUG);
+        log_parse_environment();
+        log_open();
+
+        test_acquire_random_bytes(false);
+        test_acquire_random_bytes(true);
+
+        test_pseudorandom_bytes();
+
+        return 0;
+}