feat: Add make Record function

tests/rustysearch.rs

@@ -1,6 +1,7 @@
 #[cfg(test)]
 mod tests {
     use rustysearch::{search::Rustysearch, types::Stats};
+    use serde_json::json;
 
     #[test]
     fn test_write_new_stats() {
@@ -118,6 +119,19 @@ mod tests {
         assert_eq!(tokens, vec!["hello", "world"]);
     }
 
+    #[test]
+    fn test_make_record() {
+        let search = Rustysearch::new("/tmp/rustysearch");
+        let term = "hello world";
+        let term_info = json!({
+            "frequency": 100,
+            "idf": 1.5,
+        });
+
+        let record = search.make_record(term, &term_info);
+        assert_eq!(record, "hello world\t{\"frequency\":100,\"idf\":1.5}\n");
+    }
+
     // Helper function to clean up the stats file
     fn clean_stats(tmp_path: &str) {
         let search = Rustysearch::new(tmp_path);