diff --git a/application/src/DBAL/Types/SystemSlugType.php b/application/src/DBAL/Types/SystemSlugType.php
index d7fc1f1..58c45fb 100644
--- a/application/src/DBAL/Types/SystemSlugType.php
+++ b/application/src/DBAL/Types/SystemSlugType.php
@@ -13,7 +13,10 @@ final class SystemSlugType extends AbstractEnumType
 {
     public const IMPRINT = 'IMPRINT';
 
+    public const GUEST_USER = 'GUEST_USER';
+
     protected static $choices = [
         self::IMPRINT => 'imprint',
+        self::GUEST_USER => 'guest user',
     ];
 }
diff --git a/application/src/DataFixtures/SourceFixtures.php b/application/src/DataFixtures/SourceFixtures.php
index 86be2c9..08298f6 100644
--- a/application/src/DataFixtures/SourceFixtures.php
+++ b/application/src/DataFixtures/SourceFixtures.php
@@ -7,15 +7,21 @@ use Doctrine\Common\Persistence\ObjectManager;
 use App\Entity\Source\Primitive\Text\TextSource;
 use App\Entity\Source\Primitive\Text\TextSourceInterface;
 use App\DBAL\Types\SystemSlugType;
+use App\Entity\Source\Complex\UserSource;
+use App\Entity\Source\Complex\UserSourceInterface;
 
 class SourceFixtures extends Fixture
 {
     public function load(ObjectManager $manager)
     {
         $manager->persist($this->getImpressum());
+        $manager->persist($this->getGuestUser());
         $manager->flush();
     }
 
+    /**
+     * @return TextSourceInterface The example source for the impressum
+     */
     private function getImpressum(): TextSourceInterface
     {
         $source = new TextSource();
@@ -24,4 +30,15 @@ class SourceFixtures extends Fixture
 
         return $source;
     }
+
+    /**
+     * @return UserSourceInterface The UserSource which should be used for the anonymous user
+     */
+    private function getGuestUser(): UserSourceInterface
+    {
+        $source = new UserSource();
+        $source->setSlug(SystemSlugType::GUEST_USER);
+
+        return $source;
+    }
 }
diff --git a/application/tests/Integration/FixturesIntegrationTest.php b/application/tests/Integration/DataFixtures/SourceFixturesIntegrationTest.php
similarity index 56%
rename from application/tests/Integration/FixturesIntegrationTest.php
rename to application/tests/Integration/DataFixtures/SourceFixturesIntegrationTest.php
index da258de..a0138da 100644
--- a/application/tests/Integration/FixturesIntegrationTest.php
+++ b/application/tests/Integration/DataFixtures/SourceFixturesIntegrationTest.php
@@ -1,14 +1,14 @@
 <?php
 
-namespace Tests\Integration;
+namespace Tests\Integration\DataFixtures;
 
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 use Doctrine\ORM\EntityManager;
 use App\Entity\Source\AbstractSource;
 use App\DBAL\Types\SystemSlugType;
-use App\Entity\Source\Primitive\Text\TextSourceInterface;
+use App\Entity\Source\Complex\UserSourceInterface;
 
-class FixturesIntegrationTest extends KernelTestCase
+class SourceFixturesIntegrationTest extends KernelTestCase
 {
     /**
      * @var EntityManager
@@ -21,13 +21,17 @@ class FixturesIntegrationTest extends KernelTestCase
         $this->entityManager = static::$kernel->getContainer()->get('doctrine')->getManager();
     }
 
-    public function testImpressum(): void
+    public function testImpressumSource(): void
     {
         $sourceRepository = $this->entityManager->getRepository(AbstractSource::class);
-        /**
-         * @var TextSourceInterface
-         */
         $imprint = $sourceRepository->findOneBy(['slug' => SystemSlugType::IMPRINT]);
         $this->assertInternalType('string', $imprint->getText());
     }
+
+    public function testGuestUserSource(): void
+    {
+        $sourceRepository = $this->entityManager->getRepository(AbstractSource::class);
+        $userSource = $sourceRepository->findOneBy(['slug' => SystemSlugType::GUEST_USER]);
+        $this->assertInstanceOf(UserSourceInterface::class, $userSource);
+    }
 }