1 files changed, 41 insertions, 0 deletions
diff --git a/test/timer.c b/test/timer.c
new file mode 100644
index 0000000000..962760f592
--- /dev/null
+++ b/test/timer.c
@@ -0,0 +1,41 @@
+#include "common/common.h"
+#include "osdep/timer.h"
+#include "test_utils.h"
+
+#include <time.h>
+#include <sys/time.h>
+#include <limits.h>
+
+int main(void)
+{
+    mp_time_init();
+
+    /* timekeeping */
+    {
+        int64_t now = mp_time_ns();
+        assert_true(now >= 0);
+
+        mp_sleep_ns(MP_TIME_MS_TO_NS(10));
+
+        int64_t now2 = mp_time_ns();
+        assert_true(now2 > now);
+
+        mp_sleep_ns(MP_TIME_MS_TO_NS(10));
+
+        double now3 = mp_time_sec();
+        assert_true(now3 > MP_TIME_NS_TO_S(now2));
+    }
+
+    /* arithmetic */
+    {
+        const int64_t test = 123456;
+        assert_int_equal(mp_time_ns_add(test, 1.0), test + MP_TIME_S_TO_NS(1));
+        assert_int_equal(mp_time_ns_add(test, DBL_MAX), INT64_MAX);
+        assert_int_equal(mp_time_ns_add(test, -1e13), 1);
+
+        const int64_t test2 = INT64_MAX - MP_TIME_S_TO_NS(20);
+        assert_int_equal(mp_time_ns_add(test2, 20.44), INT64_MAX);
+    }
+
+    return 0;
+}