fix tests for min version

Author: tmilos

composer.json

@@ -28,6 +28,8 @@
     "require-dev": {
         "symfony/browser-kit": "~2.7|~3.0|~4.0",
         "symfony/finder": "~2.7|~3.0|~4.0",
+        "symfony/filesystem": "~2.7|~3.0|~4.0",
+        "symfony/routing": "~2.7|~3.0|~4.0",
         "phpunit/phpunit": "^5.7",
         "php-coveralls/php-coveralls": "~2.0"
     },

src/LightSaml/SymfonyBridgeBundle/Resources/config/system.yml

@@ -9,4 +9,4 @@ services:
         class: Symfony\Component\EventDispatcher\EventDispatcher
 
     lightsaml.system.logger:
-        alias: logger
+        class: Psr\Log\NullLogger

tests/LightSaml/SymfonyBridgeBundle/Tests/DependencyInjection/LightSamlSymfonyBridgeExtensionTest.php

@@ -257,11 +257,12 @@ public function test_loads_system_custom_event_dispatcher()
         $this->assertEquals($expectedAlias, (string) $containerBuilder->getAlias('lightsaml.system.event_dispatcher'));
     }
 
-    public function test_loads_system_logger()
+    public function test_loads_system_logger_when_given_in_config()
     {
         $containerBuilder = new ContainerBuilder(new ParameterBag());
         $extension = new LightSamlSymfonyBridgeExtension();
         $config = $this->getDefaultConfig();
+        $config['light_saml_symfony_bridge']['system']['logger'] = 'some.logger';
 
         $extension->load($config, $containerBuilder);
 

tests/LightSaml/SymfonyBridgeBundle/Tests/Functional/FunctionalTest.php

@@ -31,6 +31,7 @@
 use Psr\Log\LoggerInterface;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Filesystem\Filesystem;
 
 class FunctionalTest extends WebTestCase
 {
@@ -39,6 +40,8 @@ protected function setUp()
         parent::setUp();
         $_SERVER['KERNEL_CLASS'] = TestKernel::class;
         $_SERVER['KERNEL_DIR'] = __DIR__;
+        $fs = new Filesystem();
+        $fs->remove(__DIR__.'/cache');
     }
 
     protected static function getKernelClass()