minor symfony#25970 [TwigBridge] update test for Twig performance optimizations (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
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[TwigBridge] update test for Twig performance optimizations

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | twigphp/Twig#2617
| License       | MIT
| Doc PR        |

Commits
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21bbad9 update test for Twig performance optimizations

Author: nicolas-grekas

src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php

@@ -57,6 +57,10 @@ protected function getVariableGetterWithoutStrictCheck($name)
 
     protected function getVariableGetterWithStrictCheck($name)
     {
+        if (Environment::VERSION_ID > 20404) {
+            return sprintf('(isset($context["%s"]) || array_key_exists("%1$s", $context) ? $context["%1$s"] : (function () { throw new Twig_Error_Runtime(\'Variable "%1$s" does not exist.\', 0, $this->source); })())', $name);
+        }
+
         if (Environment::MAJOR_VERSION >= 2) {
             return sprintf('(isset($context["%s"]) || array_key_exists("%1$s", $context) ? $context["%1$s"] : (function () { throw new Twig_Error_Runtime(\'Variable "%1$s" does not exist.\', 0, $this->getSourceContext()); })())', $name);
         }