feat: idempotent handlers, deterministic activity ids

crates/adapters/object-storage/src/lib.rs

@@ -136,3 +136,29 @@ pub fn create(config: &::config::StorageConfig) -> anyhow::Result<Arc<dyn Object
         StorageConfig::from_config(config)?,
     )))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use domain::value_objects::{MovieId, PosterPath};
+    use object_store::memory::InMemory;
+
+    #[tokio::test]
+    async fn image_cleanup_is_idempotent_when_run_twice() {
+        let storage = Arc::new(ObjectStorageAdapter::new(Arc::new(InMemory::new())));
+        storage.store("posters/m1.webp", b"img").await.unwrap();
+        let handler = ImageCleanupHandler::new(storage.clone());
+        let event = DomainEvent::MovieDeleted {
+            movie_id: MovieId::from_uuid(uuid::Uuid::new_v4()),
+            poster_path: Some(PosterPath::new("posters/m1.webp".into()).unwrap()),
+        };
+
+        handler.handle(&event).await.unwrap();
+        handler.handle(&event).await.unwrap();
+
+        assert!(matches!(
+            storage.get("posters/m1.webp").await,
+            Err(DomainError::NotFound(_))
+        ));
+    }
+}