diff --git a/tests/test.c b/tests/test.c
index c1cdd27..ade140e 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -8,6 +8,7 @@
 #include "paging.h"
 #include "serial.h"
 #include "stack.h"
+#include "synchro.h"
 
 void testPhymem(void)
 {
@@ -236,20 +237,44 @@ static void kthread2(void *strIn)
 void sleepThread(void *arg){
     (void)arg;
     int secSleep = 0;
-    while (1){
+    while (secSleep < 5){
         printf("Sleeping loop %d\n", secSleep);
         secSleep++;
         kthreadMsleep(1000);
     }
+    kthreadMsleep(0);
+    printf("I should never be showed\n");
+    assert(1);
+}
+
+struct mutex mutexTest;
+
+void mutThread(void *arg){
+    (void)arg;
+    printf("%s started\n", (char *)arg);
+    int test = 5;
+    while(test > 0){
+        mutexLock(&mutexTest);
+        printf("%s sleep\n", (char *)arg);
+        kthreadMsleep(1000);
+        printf("%s up\n", (char *)arg);
+        mutexUnlock(&mutexTest);
+        test--;
+    }
 }
 
 void testKthread()
 {
+    mutexInit(&mutexTest);
     // It is not expected to have necessarily "Hello world\n" properly written
-    kthreadCreate("Test1", (cpu_kstate_function_arg1_t *)kthread1, (void *)"Hlowrd\n");
     kthreadCreate("Test2", (cpu_kstate_function_arg1_t *)kthread2, (void *)"el ol\n");
+    kthreadCreate("Test1", (cpu_kstate_function_arg1_t *)kthread1, (void *)"Hlowrd\n");
     kthreadMsleep(1000);
     kthreadCreate("sleep", sleepThread, NULL);
+    kthreadMsleep(5000);
+    kthreadCreate("mtest1", mutThread, "mut1");
+    kthreadCreate("mtest2", mutThread, "mut2");
+    kthreadCreate("mtest3", mutThread, "mut3");
 }
 
 void run_test(void)