diff --git a/src/renderer/renderer.rs b/src/renderer/renderer.rs
index 0426e8f..5e05388 100644
--- a/src/renderer/renderer.rs
+++ b/src/renderer/renderer.rs
@@ -152,5 +152,6 @@ mod tests {
             .cloned()
             .collect();
         assert_eq!(do_the_walk(&context, "cat"), &"kitty");
+        assert_eq!(do_the_walk(&number_context, "tiger"), &3);
     }
 }