test with files are now sequentials

src/drivers/drv_disk.rs

@@ -42,16 +42,20 @@ impl DrvDisk {
 
 #[cfg(test)]
 mod test {
+    use serial_test::serial;
+
     use super::DrvDisk;
     use crate::Disk;
 
     #[test]
+    #[serial]
     fn test_init_driver() {
         let disk = Disk::init_disk();
         let _ = DrvDisk::init_drv_disk(disk);
     }
 
     #[test]
+    #[serial]
     fn test_read_write_drv_disk() {
         let disk = Disk::init_disk();
         let mut drv_disk = DrvDisk::init_drv_disk(disk);