minor #14945 [Config] Fix test name (dosten)

This PR was merged into the 2.7 branch.

Discussion
----------

[Config] Fix test name

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

Commits
-------

7bb0812 Fix test name

src/Symfony/Component/Config/Tests/ConfigCacheTest.php

@@ -43,7 +43,7 @@ class ConfigCacheTest extends \PHPUnit_Framework_TestCase
         }
     }
 
-    public function testToString()
+    public function testGetPath()
     {
         $cache = new ConfigCache($this->cacheFile, true);