1 files changed, 6 insertions, 0 deletions
diff --git a/tests/mutex2.c b/tests/mutex2.c
index 7956f14..b161899 100644
--- a/tests/mutex2.c
+++ b/tests/mutex2.c
@@ -16,8 +16,14 @@ pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 int
 main()
 {
+  assert(mutex == PTHREAD_MUTEX_INITIALIZER);
+
   assert(pthread_mutex_lock(&mutex) == 0);
 
+  assert(mutex != PTHREAD_MUTEX_INITIALIZER);
+
+  assert(mutex != NULL);
+
   assert(pthread_mutex_unlock(&mutex) == 0);
 
   return 0;