minor #20511 [TwigBridge] fix tests (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
----------

[TwigBridge] fix tests

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

Adapt tests for null coalescing support from twigphp/Twig#2238.

Commits
-------

1f15395 [TwigBridge] fix tests

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

@@ -80,7 +80,13 @@ if ($this->env->isDebug()) {
 }
 
 EOTXT;
-        $expected = preg_replace('/%(.*?)%/', PHP_VERSION_ID >= 50400 ? '(isset($context["$1"]) ? $context["$1"] : null)' : '$this->getContext($context, "$1")', $expected);
+        if (PHP_VERSION_ID >= 70000) {
+            $expected = preg_replace('/%(.*?)%/', '($context["$1"] ?? null)', $expected);
+        } elseif (PHP_VERSION_ID >= 50400) {
+            $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
+        } else {
+            $expected = preg_replace('/%(.*?)%/', '$this->getContext($context, "$1")', $expected);
+        }
 
         $this->assertSame($expected, $compiler->compile($node)->getSource());
     }
@@ -106,7 +112,14 @@ if ($this->env->isDebug()) {
 }
 
 EOTXT;
-        $expected = preg_replace('/%(.*?)%/', PHP_VERSION_ID >= 50400 ? '(isset($context["$1"]) ? $context["$1"] : null)' : '$this->getContext($context, "$1")', $expected);
+
+        if (PHP_VERSION_ID >= 70000) {
+            $expected = preg_replace('/%(.*?)%/', '($context["$1"] ?? null)', $expected);
+        } elseif (PHP_VERSION_ID >= 50400) {
+            $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
+        } else {
+            $expected = preg_replace('/%(.*?)%/', '$this->getContext($context, "$1")', $expected);
+        }
 
         $this->assertSame($expected, $compiler->compile($node)->getSource());
     }

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

@@ -66,6 +66,10 @@ class FormThemeTest extends \PHPUnit_Framework_TestCase
 
     protected function getVariableGetter($name)
     {
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? null)', $name, $name);
+        }
+
         if (PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
         }

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

@@ -263,6 +263,10 @@ class SearchAndRenderBlockNodeTest extends \PHPUnit_Framework_TestCase
 
     protected function getVariableGetter($name)
     {
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? null)', $name, $name);
+        }
+
         if (PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
         }

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

@@ -39,6 +39,10 @@ class TransNodeTest extends \PHPUnit_Framework_TestCase
 
     protected function getVariableGetterWithoutStrictCheck($name)
     {
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? null)', $name, $name);
+        }
+
         if (PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
         }
@@ -48,10 +52,14 @@ class TransNodeTest extends \PHPUnit_Framework_TestCase
 
     protected function getVariableGetterWithStrictCheck($name)
     {
-        if (version_compare(\Twig_Environment::VERSION, '2.0.0-DEV', '>=')) {
+        if (\Twig_Environment::MAJOR_VERSION >= 2) {
             return sprintf('(isset($context["%s"]) || array_key_exists("%s", $context) ? $context["%s"] : $this->notFound("%s", 0))', $name, $name, $name, $name);
         }
 
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? $this->getContext($context, "%s"))', $name, $name, $name);
+        }
+
         if (PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : $this->getContext($context, "%s"))', $name, $name, $name);
         }

src/Symfony/Bridge/Twig/composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.3.9",
-        "twig/twig": "~1.27|~2.0"
+        "twig/twig": "~1.28|~2.0"
     },
     "require-dev": {
         "symfony/asset": "~2.7",