diff --git a/src/kernel/thread_manager.rs b/src/kernel/thread_manager.rs
index cb73fcc..b7ae47d 100644
--- a/src/kernel/thread_manager.rs
+++ b/src/kernel/thread_manager.rs
@@ -1,67 +1,67 @@
 //! # Thread manager
-//! 
+//!
 //! This module describes the data structure and the methods used for thread scheduling
 //! in the BurritOS operating system. A struct named `ThreadManager` holds the list of
 //! all existing threads and synchronization objects, such as `Locks`, `Semaphores` and
 //! `Conditions`.
-//! 
+//!
 //! ## Purpose
-//! 
+//!
 //! `ThreadManager` holds the state of the system processes using the following subcomponents:
-//! 
+//!
 //! ### Two lists of threads
-//! 
+//!
 //!  - **ready_list**: The list of threads ready to be executed
 //!  - **g_alive**: The list of currently executing threads
-//! 
+//!
 //! The difference between the two above lists lies in the state of the threads in question.
 //! Ready threads have just been enqueued. They are not being executed yet. The second list is
 //! needed because many threads may be executing at a given time. However, only a single thread
 //! can be handled by the machine at a time. The system thus needs to keep in memory the alive
 //! threads in case the currently running thread finishes or gets rescheduled.
-//! 
+//!
 //! ### A list of synchronization objects
-//! 
+//!
 //! Locks, Semaphores and Conditions allow resource sharing among running threads. Since resources
 //! can only be accessed by a single thread at a time, we need data structures to signal other
 //! threads that a resource may be busy or unavailable; say for example that thread **A** wants to
 //! write to a file while **B** is currently reading said file. Thread **A** mutating the state of
 //! the file could cause issues for **B**. Therefore **B** needs to lock the file in question to
 //! avoid such issues. Thread **A** will have to wait for **B** to finish reading the file.
-//! 
+//!
 //! These synchronization objects are held in an instance of the ObjAddr structure held by
 //! ThreadManager. Their state is mutated depending on the actions of the currently running thread
-//! through methods such as `ThreadManager::sem_p`. 
-//! 
+//! through methods such as `ThreadManager::sem_p`.
+//!
 //! ## Usage
-//! 
+//!
 //! `ThreadManager` is thought as a subcomponent of the `System` struct. Instanciating
 //! `System` will automatically instanciate a `ThreadManager`
-//! 
+//!
 //! Manually loading a Thread into ThreadManager to execute a program with BurritOS could look like
 //! this:
-//! 
+//!
 //! ```
 //! fn load_thread_manually(args: ...) {
 //!     let mut system = System::new(args.debug);
-//!     
+//!
 //!     let thread_exec = Thread::new(args.executable.as_str());
 //!     let thread_exec = Rc::new(RefCell::new(thread_exec));
 //!     system.get_thread_manager().get_g_alive().push(Rc::clone(&thread_exec));
-//!     
+//!
 //!     let owner1 = Process { num_thread: 0 };
 //!     let owner1 = Rc::new(RefCell::new(owner1));
 //!     system.get_thread_manager().start_thread(Rc::clone(&thread_exec), owner1, loader.elf_header.entrypoint, ptr, -1);
-//!     
+//!
 //!     let to_run = system.get_thread_manager().find_next_to_run().unwrap();
 //!     system.get_thread_manager().switch_to(&mut machine, Rc::clone(&to_run));
-//!     
+//!
 //!     machine.run(&mut system);
 //! }
 //! ```
-//!  
+//!
 //! ## Imports
-//! 
+//!
 //! The `List` and `ObjAddr` submodules used in this module are defined in the utility
 //! module. The source code of ObjAddr has been decoupled from thread_manager in an effort
 //! to keep this module concise.
@@ -448,12 +448,14 @@ mod test {
         let lock = Lock::new();
         let lock_id = thread_manager.get_obj_addrs().add_lock(lock);
         let thread = Rc::new(RefCell::new(Thread::new("test_lock")));
+        let thread_test = thread.clone();
         thread_manager.ready_to_run(Rc::clone(&thread));
         thread_manager.set_g_current_thread(Some(thread));
 
         thread_manager.lock_acquire(lock_id, &mut machine).expect("lock acquire return an error: ");
         {
             let lock = thread_manager.get_obj_addrs().search_lock(lock_id).unwrap();
+            assert_eq!(lock.owner,Some(thread_test));
             assert!(!lock.free);
             assert!(lock.waiting_queue.is_empty());
         }
@@ -461,6 +463,7 @@ mod test {
         thread_manager.lock_release(lock_id, &mut machine).expect("lock release return an error: ");
         {
             let lock = thread_manager.get_obj_addrs().search_lock(lock_id).unwrap();
+            assert_eq!(lock.owner, None);
             assert!(!lock.free);
             assert!(lock.waiting_queue.is_empty());
         }