minor #18499 [DependencyInjection] Add coverage for invalid Expression in exportParameters (JhonnyL)

This PR was merged into the 2.7 branch.

Discussion
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[DependencyInjection] Add coverage for invalid Expression in exportParameters

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Commits
-------

1931b14 [DependencyInjection] Add coverage for invalid Expression in exportParameters

Author: fabpot

Tests/Dumper/PhpDumperTest.php

@@ -17,6 +17,7 @@
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Variable;
+use Symfony\Component\ExpressionLanguage\Expression;
 
 class PhpDumperTest extends \PHPUnit_Framework_TestCase
 {
@@ -99,6 +100,7 @@ public function provideInvalidParameters()
     {
         return array(
             array(array('foo' => new Definition('stdClass'))),
+            array(array('foo' => new Expression('service("foo").foo() ~ (container.hasparameter("foo") ? parameter("foo") : "default")'))),
             array(array('foo' => new Reference('foo'))),
             array(array('foo' => new Variable('foo'))),
         );