diff --git a/relay-server/src/services/buffer/envelope_store/mod.rs b/relay-server/src/services/buffer/envelope_store/mod.rs
index e5a052b14b..0dce115473 100644
--- a/relay-server/src/services/buffer/envelope_store/mod.rs
+++ b/relay-server/src/services/buffer/envelope_store/mod.rs
@@ -28,9 +28,9 @@ pub trait EnvelopeStore {
         limit: i64,
     ) -> impl Future<Output = Result<Vec<Box<Envelope>>, Self::Error>>;
 
-    #[allow(dead_code)]
     /// Returns a set of project key pairs, representing all the unique combinations of
     /// `own_key` and `project_key` that are found in the store.
+    #[allow(dead_code)]
     fn project_key_pairs(
         &self,
     ) -> impl Future<Output = Result<HashSet<(ProjectKey, ProjectKey)>, Self::Error>>;
diff --git a/relay-server/src/services/buffer/envelope_store/sqlite.rs b/relay-server/src/services/buffer/envelope_store/sqlite.rs
index 87e3f8ec78..fe024459c6 100644
--- a/relay-server/src/services/buffer/envelope_store/sqlite.rs
+++ b/relay-server/src/services/buffer/envelope_store/sqlite.rs
@@ -562,8 +562,15 @@ mod tests {
     #[tokio::test]
     async fn test_estimate_disk_usage() {
         let db = setup_db(true).await;
-        let mut envelope_store = SqliteEnvelopeStore::new(db);
+        let mut store = SqliteEnvelopeStore::new(db.clone());
+
+        let envelopes = mock_envelopes(10);
+        store
+            .insert_many(envelopes.iter().map(|e| e.as_ref().try_into().unwrap()))
+            .await
+            .unwrap();
 
-        println!("{:?}", envelope_store.usage());
+        let usage = SqliteEnvelopeStore::estimate_usage(&db).await.unwrap();
+        assert!(usage > 0);
     }
 }