SQL Server restore database with active connections
You must switch to single user mode:

-- Close all connections and rollback all transaction
ALTER DATABASE Test_DB SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
GO

RESTORE FILELISTONLY
   FROM disk = '\\staging_server\path\to\db_backup.bak'    
-- Restore the files for 
RESTORE DATABASE Test_DB
   FROM disk = '\\staging_server\path\to\db_backup.bak'
   WITH replace,
   MOVE 'Test_DB' TO 'D:\R2_BIN\Test_DB.mdf', 
   MOVE 'Test_DB_log' TO 'D:\R2_BIN\Test_DB_log.ldf', 
   stats = 5
GO

ALTER DATABASE Test_DB SET MULTI_USER;
GO