Added a test case for walking up the context

js/test_cases/walk_up/input1.json

@@ -0,0 +1,11 @@
+{
+  "company": "The Pendulum",
+  "globals": {
+    "email": "email hidden"
+  },
+  "people": [
+    {"name": "Alice", "job": "Chief Swinger"},
+    {"name": "Bob", "job": "Chief Swayer"},
+    {"name": "Chris", "job": "Barista", "company": "GenericCoffee"}
+  ]
+}

js/test_cases/walk_up/main.dust

@@ -0,0 +1,4 @@
+Directory for {company}:{~n}
+{#people}
+{name}: {job} at {company} (email: {globals.email}){~n}
+{/people}