Add regression test for #1909 (long filename rename not reported as unused)

rslib/src/media/check.rs

@@ -552,6 +552,7 @@ pub(crate) mod test {
 
     use super::*;
     use crate::collection::CollectionBuilder;
+    use crate::tests::NoteAdder;
 
     fn common_setup() -> Result<(TempDir, MediaManager, Collection)> {
         let dir = tempdir()?;
@@ -869,4 +870,33 @@ Unused: unused.jpg
 
         Ok(())
     }
+
+    /// Regression test for https://github.com/ankitects/anki/issues/1909
+    #[test]
+    fn long_filename_rename_not_reported_as_unused() -> Result<()> {
+        let (_dir, mgr, mut col) = common_setup()?;
+
+        // 65 Greek α characters (2 bytes each) + ".mp3" = 134 bytes
+        let long_filename = format!("{}.mp3", "α".repeat(65));
+        assert!(long_filename.len() > 120);
+
+        NoteAdder::basic(&mut col)
+            .fields(&["test", &format!("[sound:{}]", long_filename)])
+            .add(&mut col);
+
+        write_file(mgr.media_folder.join(&long_filename), "audio data")?;
+
+        let output = {
+            let mut checker = col.media_checker()?;
+            checker.check()?
+        };
+
+        assert!(output.renamed.contains_key(&long_filename));
+        let new_filename = output.renamed.get(&long_filename).unwrap();
+        assert!(new_filename.len() <= 120);
+        assert!(!output.unused.contains(new_filename));
+        assert!(!output.missing.contains(new_filename));
+
+        Ok(())
+    }
 }