diff --git a/Classes/Utility/Tests/LinkUtility.php b/Classes/Utility/Tests/LinkUtility.php
index fa711d7..4b57199 100644
--- a/Classes/Utility/Tests/LinkUtility.php
+++ b/Classes/Utility/Tests/LinkUtility.php
@@ -94,6 +94,10 @@ public static function getRedundantLinkNames(array $elements): array
 
         /** @var \DOMElement $element */
         foreach ($elements as $element) {
+            if (!$element) {
+                continue;
+            }
+
             if (StringUtility::stripNewLines($element->textContent) !== ''
                 && !in_array($element->textContent, $linkNames)
             ) {
diff --git a/composer.json b/composer.json
index 3192880..b31b69c 100644
--- a/composer.json
+++ b/composer.json
@@ -23,6 +23,10 @@
     "symfony/property-info": "^5.4",
     "ext-dom": "*"
   },
+  "require-dev": {
+    "typo3/testing-framework": "^6.9.0",
+    "friendsofphp/php-cs-fixer": "^3.0"
+  },
   "replace": {
     "typo3-ter/uw-a11y-check": "self.version"
   },
@@ -38,7 +42,11 @@
   },
   "config": {
     "vendor-dir": ".Build/vendor",
-    "bin-dir": ".Build/bin"
+    "bin-dir": ".Build/bin",
+    "allow-plugins": {
+      "typo3/cms-composer-installers": true,
+      "typo3/class-alias-loader": true
+    }
   },
   "extra": {
     "typo3/cms": {
@@ -46,10 +54,5 @@
       "app-dir": ".Build",
       "web-dir": ".Build/public"
     }
-  },
-  "scripts": {
-    "post-autoload-dump": [
-      "TYPO3\\TestingFramework\\Composer\\ExtensionTestEnvironment::prepare"
-    ]
   }
 }