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diff --git a/vendor/twig/twig/lib/Twig/Test/NodeTestCase.php b/vendor/twig/twig/lib/Twig/Test/NodeTestCase.php
new file mode 100644
index 000000000..a6b550cf8
--- /dev/null
+++ b/vendor/twig/twig/lib/Twig/Test/NodeTestCase.php
@@ -0,0 +1,68 @@
+<?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.
+ */
+abstract class Twig_Test_NodeTestCase extends PHPUnit_Framework_TestCase
+{
+    abstract public function getTests();
+
+    /**
+     * @dataProvider getTests
+     */
+    public function testCompile($node, $source, $environment = null, $isPattern = false)
+    {
+        $this->assertNodeCompilation($source, $node, $environment, $isPattern);
+    }
+
+    public function assertNodeCompilation($source, Twig_Node $node, Twig_Environment $environment = null, $isPattern = false)
+    {
+        $compiler = $this->getCompiler($environment);
+        $compiler->compile($node);
+
+        if ($isPattern) {
+            $this->assertStringMatchesFormat($source, trim($compiler->getSource()));
+        } else {
+            $this->assertEquals($source, trim($compiler->getSource()));
+        }
+    }
+
+    protected function getCompiler(Twig_Environment $environment = null)
+    {
+        return new Twig_Compiler(null === $environment ? $this->getEnvironment() : $environment);
+    }
+
+    protected function getEnvironment()
+    {
+        return new Twig_Environment(new Twig_Loader_Array(array()));
+    }
+
+    protected function getVariableGetter($name, $line = false)
+    {
+        $line = $line > 0 ? "// line {$line}\n" : '';
+
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('%s($context["%s"] ?? null)', $line, $name, $name);
+        }
+
+        if (PHP_VERSION_ID >= 50400) {
+            return sprintf('%s(isset($context["%s"]) ? $context["%s"] : null)', $line, $name, $name);
+        }
+
+        return sprintf('%s$this->getContext($context, "%s")', $line, $name);
+    }
+
+    protected function getAttributeGetter()
+    {
+        if (function_exists('twig_template_get_attributes')) {
+            return 'twig_template_get_attributes($this, ';
+        }
+
+        return '$this->getAttribute(';
+    }
+}