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diff --git a/vendor/twig/twig/test/Twig/Tests/NodeVisitor/OptimizerTest.php b/vendor/twig/twig/test/Twig/Tests/NodeVisitor/OptimizerTest.php
new file mode 100644
index 000000000..0a48e6dd7
--- /dev/null
+++ b/vendor/twig/twig/test/Twig/Tests/NodeVisitor/OptimizerTest.php
@@ -0,0 +1,124 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Tests_NodeVisitor_OptimizerTest extends PHPUnit_Framework_TestCase
+{
+    public function testRenderBlockOptimizer()
+    {
+        $env = new Twig_Environment($this->getMockBuilder('Twig_LoaderInterface')->getMock(), array('cache' => false, 'autoescape' => false));
+
+        $stream = $env->parse($env->tokenize(new Twig_Source('{{ block("foo") }}', 'index')));
+
+        $node = $stream->getNode('body')->getNode(0);
+
+        $this->assertEquals('Twig_Node_Expression_BlockReference', get_class($node));
+        $this->assertTrue($node->getAttribute('output'));
+    }
+
+    public function testRenderParentBlockOptimizer()
+    {
+        $env = new Twig_Environment($this->getMockBuilder('Twig_LoaderInterface')->getMock(), array('cache' => false, 'autoescape' => false));
+
+        $stream = $env->parse($env->tokenize(new Twig_Source('{% extends "foo" %}{% block content %}{{ parent() }}{% endblock %}', 'index')));
+
+        $node = $stream->getNode('blocks')->getNode('content')->getNode(0)->getNode('body');
+
+        $this->assertEquals('Twig_Node_Expression_Parent', get_class($node));
+        $this->assertTrue($node->getAttribute('output'));
+    }
+
+    public function testRenderVariableBlockOptimizer()
+    {
+        if (PHP_VERSION_ID >= 50400) {
+            $this->markTestSkipped('not needed on PHP >= 5.4');
+        }
+
+        $env = new Twig_Environment($this->getMockBuilder('Twig_LoaderInterface')->getMock(), array('cache' => false, 'autoescape' => false));
+        $stream = $env->parse($env->tokenize(new Twig_Source('{{ block(name|lower) }}', 'index')));
+
+        $node = $stream->getNode('body')->getNode(0)->getNode(1);
+
+        $this->assertEquals('Twig_Node_Expression_BlockReference', get_class($node));
+        $this->assertTrue($node->getAttribute('output'));
+    }
+
+    /**
+     * @dataProvider getTestsForForOptimizer
+     */
+    public function testForOptimizer($template, $expected)
+    {
+        $env = new Twig_Environment($this->getMockBuilder('Twig_LoaderInterface')->getMock(), array('cache' => false));
+
+        $stream = $env->parse($env->tokenize(new Twig_Source($template, 'index')));
+
+        foreach ($expected as $target => $withLoop) {
+            $this->assertTrue($this->checkForConfiguration($stream, $target, $withLoop), sprintf('variable %s is %soptimized', $target, $withLoop ? 'not ' : ''));
+        }
+    }
+
+    public function getTestsForForOptimizer()
+    {
+        return array(
+            array('{% for i in foo %}{% endfor %}', array('i' => false)),
+
+            array('{% for i in foo %}{{ loop.index }}{% endfor %}', array('i' => true)),
+
+            array('{% for i in foo %}{% for j in foo %}{% endfor %}{% endfor %}', array('i' => false, 'j' => false)),
+
+            array('{% for i in foo %}{% include "foo" %}{% endfor %}', array('i' => true)),
+
+            array('{% for i in foo %}{% include "foo" only %}{% endfor %}', array('i' => false)),
+
+            array('{% for i in foo %}{% include "foo" with { "foo": "bar" } only %}{% endfor %}', array('i' => false)),
+
+            array('{% for i in foo %}{% include "foo" with { "foo": loop.index } only %}{% endfor %}', array('i' => true)),
+
+            array('{% for i in foo %}{% for j in foo %}{{ loop.index }}{% endfor %}{% endfor %}', array('i' => false, 'j' => true)),
+
+            array('{% for i in foo %}{% for j in foo %}{{ loop.parent.loop.index }}{% endfor %}{% endfor %}', array('i' => true, 'j' => true)),
+
+            array('{% for i in foo %}{% set l = loop %}{% for j in foo %}{{ l.index }}{% endfor %}{% endfor %}', array('i' => true, 'j' => false)),
+
+            array('{% for i in foo %}{% for j in foo %}{{ foo.parent.loop.index }}{% endfor %}{% endfor %}', array('i' => false, 'j' => false)),
+
+            array('{% for i in foo %}{% for j in foo %}{{ loop["parent"].loop.index }}{% endfor %}{% endfor %}', array('i' => true, 'j' => true)),
+
+            array('{% for i in foo %}{{ include("foo") }}{% endfor %}', array('i' => true)),
+
+            array('{% for i in foo %}{{ include("foo", with_context = false) }}{% endfor %}', array('i' => false)),
+
+            array('{% for i in foo %}{{ include("foo", with_context = true) }}{% endfor %}', array('i' => true)),
+
+            array('{% for i in foo %}{{ include("foo", { "foo": "bar" }, with_context = false) }}{% endfor %}', array('i' => false)),
+
+            array('{% for i in foo %}{{ include("foo", { "foo": loop.index }, with_context = false) }}{% endfor %}', array('i' => true)),
+        );
+    }
+
+    public function checkForConfiguration(Twig_NodeInterface $node = null, $target, $withLoop)
+    {
+        if (null === $node) {
+            return;
+        }
+
+        foreach ($node as $n) {
+            if ($n instanceof Twig_Node_For) {
+                if ($target === $n->getNode('value_target')->getAttribute('name')) {
+                    return $withLoop == $n->getAttribute('with_loop');
+                }
+            }
+
+            $ret = $this->checkForConfiguration($n, $target, $withLoop);
+            if (null !== $ret) {
+                return $ret;
+            }
+        }
+    }
+}