diff --git a/src/rstd/collections/tree.rs b/src/rstd/collections/tree.rs
index 30e7d4e..0608244 100644
--- a/src/rstd/collections/tree.rs
+++ b/src/rstd/collections/tree.rs
@@ -245,7 +245,7 @@ mod tests {
         testing::TestContextPlain,
     };
 
-    use super::context::*;
+    use super::{context::*, *};
 
     type Trees = TreeContext2<
         'static,
@@ -259,6 +259,20 @@ mod tests {
         Trees::new((DefaultComparator.into(), u64::f()))
     }
 
+    fn singular_node(
+        trees: &BalancedTrees<Trees>,
+    ) -> Node<'static, TestContextPlain, AtomicObject<u64>> {
+        trees
+            .try_join(trees.empty(), 0.into(), trees.empty())
+            .unwrap()
+    }
+
+    fn singular_tree(
+        trees: &BalancedTrees<Trees>,
+    ) -> Tree<'static, TestContextPlain, AtomicObject<u64>> {
+        trees.tree_of(singular_node(trees)).unwrap()
+    }
+
     #[test]
     fn empty_has_height_0() {
         let trees = new_trees();
@@ -275,16 +289,19 @@ mod tests {
     #[test]
     fn one_has_height_1() {
         let trees = BalancedTrees::new(new_trees());
-        let tree = trees.empty();
-        let tree = trees.clone().add_tree(tree, 0.into()).unwrap();
-        assert_eq!(trees.height(&tree), 1);
+        assert_eq!(trees.height(&singular_tree(&trees)), 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());
+        assert!(trees.refer(&singular_tree(&trees)).is_some());
+    }
+
+    #[test]
+    fn reference_equal_to_itself() {
+        let trees = BalancedTrees::new(new_trees());
+        let reference = trees.refer(&singular_tree(&trees)).unwrap();
+        assert!(trees.equal(&reference, &reference));
     }
 }