diff --git a/src/rmap.rs b/src/rmap.rs
index 2da898565..a80af6e81 100644
--- a/src/rmap.rs
+++ b/src/rmap.rs
@@ -393,6 +393,8 @@ mod tests {
         let root = Rc::new(root);
         root.finish(Rc::clone(&root));
 
-        println!("{:?}", root);
+        let output = format!("{:?}", root);
+        assert!(output.starts_with("ResourceMap"));
+        assert!(output.ends_with("}"));
     }
 }