fix: Add missing tempdir import and remove unused imports/variables

src/tests.rs

@@ -3,8 +3,8 @@ mod tests {
     use std::fs;
     use std::path::Path;
     use std::process::Command;
-    use std::ffi::OsStr;
     use std::process::Stdio;
+    use tempfile::tempdir;
 
     // Helper function to run the keep command with given arguments
     fn run_keep(args: &[&str]) -> std::process::Output {