Finish porting over the walk test.

src/renderer/renderer.rs

@@ -458,6 +458,26 @@ mod tests {
                 .unwrap(),
             "kitty".to_owned()
         );
+        assert_eq!(
+            new_walk_path(
+                &vec![&number_context as &dyn ContextElement],
+                &vec!["tiger"]
+            )
+            .unwrap()
+            .render(&Vec::new())
+            .unwrap(),
+            "3".to_owned()
+        );
+        assert_eq!(
+            new_walk_path(
+                &vec![&deep_context as &dyn ContextElement],
+                &vec!["tiger", "food"]
+            )
+            .unwrap()
+            .render(&Vec::new())
+            .unwrap(),
+            "people".to_owned()
+        );
     }
 
     #[test]