N°2651 rollback gitignore for lib tests dirs

Too dangerous ! We'll work properly on this but for 2.8

lib/symfony/framework-bundle/Tests/Routing/DelegatingLoaderTest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\Routing;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Controller\ControllerNameParser;
+use Symfony\Bundle\FrameworkBundle\Routing\DelegatingLoader;
+use Symfony\Component\Config\Loader\LoaderResolver;
+
+class DelegatingLoaderTest extends TestCase
+{
+    public function testConstructorApi()
+    {
+        $controllerNameParser = $this->getMockBuilder(ControllerNameParser::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+        new DelegatingLoader($controllerNameParser, new LoaderResolver());
+        $this->assertTrue(true, '__construct() takes a ControllerNameParser and LoaderResolverInterface respectively as its first and second argument.');
+    }
+}