diff --git a/pttodoer/src/main.rs b/pttodoer/src/main.rs
index cf0210f..08ae15c 100644
--- a/pttodoer/src/main.rs
+++ b/pttodoer/src/main.rs
@@ -244,24 +244,32 @@ mod test_db {
    use super::*;
 
    #[test]
-   fn conflicting_save_fails() {
+   fn conflicting_save_handled() {
+      use std::ops::Add;
+
       let d = TempDir::new(&TS::now().to_string()).expect("failed to create a temp dir");
       let d = d.path().display().to_string();
-
+      let p = format!("{}/f", &d);
       {
-         let p = format!("{}/f", &d);
-         eprintln!("p={}", p);
-         let mut f = std::fs::File::create(p).expect("failed to create a file in cwd");
+         let mut f = std::fs::File::create(p.clone()).expect("failed to create a file in cwd");
          f.write_all(b"- x").expect("failed to create a file");
       }
 
       let mut db = DB::new(d.clone()).expect("failed to open tempd");
       assert_eq!(1, db.tasks_and_metadatas[0].tasks.len());
-      db.tasks_and_metadatas[0].tasks.0.push(Task::new());
-      let stale_db = db.clone();
 
-      db.save(false).expect("failed to save db with new task");
-      assert_eq!(false, stale_db.save(false).is_ok());
+      std::fs::File::open(p)
+         .expect("failed to open file to change modtime")
+         .set_modified(std::time::SystemTime::now().add(std::time::Duration::new(10, 0)))
+         .expect("failed to change modtime");
+
+      db.tasks_and_metadatas[0].tasks.0.push(Task::new());
+      db.save(false).expect("save as conflicting update shouldve saved as a different file");
+
+      let db = DB::new(d.clone()).expect("failed to open tempd again");
+      assert_eq!(2, db.tasks_and_metadatas.len());
+      assert_eq!(1, db.tasks_and_metadatas[0].tasks.len());
+      assert_eq!(2, db.tasks_and_metadatas[1].tasks.len());
    }