Update real_critical_test.py

add sleep make sure init is done

Author: JE-Chen

test/unit_test/critical_exit/real_critical_test.py

@@ -13,6 +13,8 @@
 simulate you can't use your mouse because you use while true to set mouse position
 """
 try:
+    from time import sleep
+    sleep(3)
     while True:
         set_position(200, 400)
         set_position(400, 600)