Update cli/tests/cli/create/option_one_file_system.rs

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: ChanTsune

cli/tests/cli/create/option_one_file_system.rs

@@ -46,6 +46,12 @@ mod platform {
         let _ = fs::remove_dir_all("option_one_file_system_mount");
         fs::create_dir_all("option_one_file_system_mount/in/subdir").unwrap();
 
+        // Defer cleanup to ensure it runs even if the test panics.
+        scopeguard::defer! {
+            let _ = Command::new("umount").arg("option_one_file_system_mount/in/subdir").status();
+            let _ = fs::remove_dir_all("option_one_file_system_mount");
+        };
+
         fs::write("option_one_file_system_mount/in/main_file.txt", "main fs").unwrap();
 
         let mount_status = Command::new("mount")