Add failing test for nested higher-order sections

test/_files/nested_higher_order_sections.js

@@ -0,0 +1,8 @@
+({
+  bold: function () {
+    return function (text, render) {
+      return '<b>' + render(text) + '</b>';
+    };
+  },
+  person: { name: 'Jonas' }
+});

test/_files/nested_higher_order_sections.mustache

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+{{#bold}}{{#person}}My name is {{name}}!{{/person}}{{/bold}}

test/_files/nested_higher_order_sections.txt

@@ -0,0 +1 @@
+<b>My name is Jonas!</b>