diff --git a/Tests/DependencyInjection/ConfigurationTest.php b/Tests/DependencyInjection/ConfigurationTest.php
new file mode 100644
index 00000000..0667330b
--- /dev/null
+++ b/Tests/DependencyInjection/ConfigurationTest.php
@@ -0,0 +1,55 @@
+<?php
+
+/*
+ * (c) Christian Gripp <mail@core23.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Core23\DompdfBundle\Tests\DependencyInjection;
+
+use Core23\DompdfBundle\DependencyInjection\Configuration;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\Definition\Processor;
+
+class ConfigurationTest extends TestCase
+{
+    public function testDefaultOptions()
+    {
+        $processor = new Processor();
+
+        $config = $processor->processConfiguration(new Configuration(), array(array(
+        )));
+
+        $expected = array(
+            'webDir'   => '%kernel.root_dir%/../web',
+            'defaults' => array(),
+        );
+
+        $this->assertSame($expected, $config);
+    }
+
+    public function testOptions()
+    {
+        $processor = new Processor();
+
+        $config = $processor->processConfiguration(new Configuration(), array(array(
+            'webDir'   => '%kernel.root_dir%/../customWeb',
+            'defaults' => array(
+                'foo' => 'bar',
+                'bar' => 'baz',
+            ),
+        )));
+
+        $expected = array(
+            'webDir'   => '%kernel.root_dir%/../customWeb',
+            'defaults' => array(
+                'foo' => 'bar',
+                'bar' => 'baz',
+            ),
+        );
+
+        $this->assertSame($expected, $config);
+    }
+}
diff --git a/Tests/DependencyInjection/Core23DompdfExtensionTest.php b/Tests/DependencyInjection/Core23DompdfExtensionTest.php
new file mode 100644
index 00000000..2dfafdca
--- /dev/null
+++ b/Tests/DependencyInjection/Core23DompdfExtensionTest.php
@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * (c) Christian Gripp <mail@core23.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Core23\DompdfBundle\Tests\DependencyInjection;
+
+use Core23\DompdfBundle\DependencyInjection\Core23DompdfExtension;
+use Matthias\SymfonyDependencyInjectionTest\PhpUnit\AbstractExtensionTestCase;
+
+class Core23DompdfExtensionTest extends AbstractExtensionTestCase
+{
+    public function testLoadDefault()
+    {
+        $this->load(array(
+            'webDir'   => '%kernel.root_dir%/../customWeb',
+            'defaults' => array(
+                'foo' => 'bar',
+                'bar' => 'baz',
+            ),
+        ));
+
+        $this->assertContainerBuilderHasParameter('core23.dompdf_web', '%kernel.root_dir%/../customWeb');
+        $this->assertContainerBuilderHasParameter('core23.dompdf_options', array(
+            'foo' => 'bar',
+            'bar' => 'baz',
+        ));
+    }
+
+    protected function getContainerExtensions()
+    {
+        return array(
+            new Core23DompdfExtension(),
+        );
+    }
+}
diff --git a/composer.json b/composer.json
index f9bec4f6..a3a4d452 100644
--- a/composer.json
+++ b/composer.json
@@ -23,6 +23,7 @@
   },
   "require-dev": {
     "friendsofphp/php-cs-fixer": "^2.0",
+    "matthiasnoback/symfony-dependency-injection-test": "^1.1",
     "phpunit/phpunit": "^5.7",
     "sllh/php-cs-fixer-styleci-bridge": "^2.0",
     "symfony/phpunit-bridge": "^3.1"