Added unit test for issue

Tests/DependencyInjection/ConfigurationTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the FOSRestBundle package.
+ *
+ * (c) FriendsOfSymfony <http://friendsofsymfony.github.com/>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FOS\RestBundle\Tests\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Processor;
+
+use FOS\RestBundle\DependencyInjection\Configuration;
+
+/**
+ * FOSRestExtension test.
+ *
+ * @author Warnar Boekkooi <boekkooi>
+ */
+class ConfigurationTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Test that the formats that are Set to False or NULL aren't loaded.
+     */
+    public function testFormatsLoad()
+    {
+        $configs = array(
+            'fos_rest' => array(
+                'formats' => array(
+                    'xml' => '\SomeClass',
+                    'html' => false,
+                    'json' => null
+                )
+            )
+        );
+
+        $processor = new Processor();
+        $configuration = new Configuration();
+        $config = $processor->processConfiguration($configuration, $configs);
+
+        $this->assertEquals(1, count($config['formats']));
+        $this->assertArrayHasKey('xml', $config['formats']);
+    }
+}