[appveyor] Workaround GitHub disabling of low versions of TLS

Author: nicolas-grekas

Tests/RouterTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Routing\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\Router;
 use Symfony\Component\HttpFoundation\Request;
 
@@ -83,7 +84,7 @@ public function testThatRouteCollectionIsLoaded()
     {
         $this->router->setOption('resource_type', 'ResourceType');
 
-        $routeCollection = $this->getMockBuilder('Symfony\Component\Routing\RouteCollection')->getMock();
+        $routeCollection = new RouteCollection();
 
         $this->loader->expects($this->once())
             ->method('load')->with('routing.yml', 'ResourceType')