minor #3838 fix filename typo in cookbook/form/unit_testing.rst (hice3000)

This PR was merged into the 2.3 branch.

Discussion
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fix filename typo in cookbook/form/unit_testing.rst

Commits
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3f956a3 fix filename typo in cookbook/form/unit_testing.rst

Author: weaverryan

cookbook/form/unit_testing.rst

@@ -36,7 +36,7 @@ The Basics
 
 The simplest ``TypeTestCase`` implementation looks like the following::
 
-    // src/Acme/TestBundle/Tests/Form/Type/TestedTypeTests.php
+    // src/Acme/TestBundle/Tests/Form/Type/TestedTypeTest.php
     namespace Acme\TestBundle\Tests\Form\Type;
 
     use Acme\TestBundle\Form\Type\TestedType;