diff --git a/test/Twig/Tests/Fixtures/expressions/array.test b/test/Twig/Tests/Fixtures/expressions/array.test
index 843154058..5b81a0e59 100644
--- a/test/Twig/Tests/Fixtures/expressions/array.test
+++ b/test/Twig/Tests/Fixtures/expressions/array.test
@@ -27,6 +27,13 @@ Twig supports array notation
     2,
   ]|join(',')
 }}
+
+{# keys can be any expression #}
+{% set a = 1 %}
+{% set b = "foo" %}
+{% set ary = { a: 'a', b: 'b', 'c': 'c', a~b: 'd' } %}
+{{ ary|keys|join(',') }}
+{{ ary|join(',') }}
 --DATA--
 return array('bar' => 'bar', 'foo' => array('bar' => 'bar'))
 --EXPECT--