minor #19994 [DependencyInjection] Env parameterbag fix: use the correct exception class. (paradajozsef)

This PR was squashed before being merged into the 3.2-dev branch (closes #19994).

Discussion
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[DependencyInjection] Env parameterbag fix: use the correct exception class.

| Q             | A
| ------------- | ---
| Branch?       | "master"
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Small fix after #19681 No description needed imo. :)

Commits
-------

b016c60 [DependencyInjection] Env parameterbag fix: use the correct exception class.

src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\ParameterBag;
 
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 
 /**
  * @author Nicolas Grekas <p@tchwork.com>

src/Symfony/Component/DependencyInjection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\ParameterBag;
+
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
+
+class EnvPlaceholderParameterBagTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testGetThrowsInvalidArgumentExceptionIfEnvNameContainsNonWordCharacters()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->get('env(%foo%)');
+    }
+}