add failing test for/related to #15

Author: japsu

tests/test_lookup.py

@@ -97,3 +97,17 @@ def test_lookup_enrich():
   template: !Var item
 ''')
     assert template.enrich({}) == [{'should_contain_5': [5]}]
+
+
+@pytest.mark.xfail
+def test_recursive_data_structure():
+    template = Template.parse('''
+!Defaults
+x:
+    y: 5
+    x: !Var x
+---
+five: !Lookup x.y
+also_five: !Lookup x.x.x.x.x.y
+''')
+    assert template.enrich({}) == [{'five': 5, 'also_five': 5}]