Skip tests if mongodb/mongodb is not installed

Author: jmikola

tests/DependencyInjection/MonologExtensionTest.php

@@ -936,6 +936,10 @@ public function testElasticsearchAndElasticaHandlers()
     /** @group legacy */
     public function testMongo()
     {
+        if (!class_exists('MongoDB\Client') {
+            $this->markTestSkipped('mongodb/mongodb is not installed.');
+        }
+
         $this->expectDeprecation('Since symfony/monolog-bundle 3.11: The "mongo" handler type is deprecated in MonologBundle since version 3.11.0, use the "mongodb" type instead.');
 
         $container = new ContainerBuilder();
@@ -1008,6 +1012,10 @@ public function testMongo()
 
     public function testMongoDB()
     {
+        if (!class_exists('MongoDB\Client') {
+            $this->markTestSkipped('mongodb/mongodb is not installed.');
+        }
+
         $container = new ContainerBuilder();
         $container->setDefinition('mongodb.client', new Definition('MongoDB\Client'));