module.exports = {
  context: { person: { name: "Larry", age: 45 } },
  handlebars: "{{#with person}}{{name}}{{age}}{{/with}}",
  dust: "{#person}{name}{age}{/person}",
  mustache: "{{#person}}{{name}}{{age}}{{/person}}"
};

@@ -162,16 +162,64 @@
 rson%7D%22,%0A
+  eco: %22%3C%25= @person.name %25%3E%3C%25= @person.age %25%3E%22,%0A
   mustac

Add eco object test