From 67833ca7bfac591594a9eb79f2857533dbe8869b Mon Sep 17 00:00:00 2001
From: timofey <tim@ongoteam.yaconnect.com>
Date: Sun, 15 Oct 2023 12:52:58 +0000
Subject: [PATCH] can_refer_to_singular

---
 src/rstd/collections/tree.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/rstd/collections/tree.rs b/src/rstd/collections/tree.rs
index 5c18e48..30e7d4e 100644
--- a/src/rstd/collections/tree.rs
+++ b/src/rstd/collections/tree.rs
@@ -279,4 +279,12 @@ mod tests {
         let tree = trees.clone().add_tree(tree, 0.into()).unwrap();
         assert_eq!(trees.height(&tree), 1);
     }
+
+    #[test]
+    fn can_refer_to_singular() {
+        let trees = BalancedTrees::new(new_trees());
+        let tree = trees.empty();
+        let tree = trees.clone().add_tree(tree, 0.into()).unwrap();
+        assert!(trees.refer(&tree).is_some());
+    }
 }