diff --git a/.woodpecker/code-style.yml b/.woodpecker/code-style.yml
index 8124b8f..453df4b 100644
--- a/.woodpecker/code-style.yml
+++ b/.woodpecker/code-style.yml
@@ -4,4 +4,4 @@ pipeline:
     commands:
       - composer global config repositories.repo-name vcs https://git.digital-competence.de/Packages/php-codesniffer
       - composer global require digicomp/php-codesniffer:@dev
-      - composer global exec -- phpcs --standard=DigiComp .
+      - composer global exec -- phpcs --runtime-set ignore_warnings_on_exit 1 --standard=DigiComp Classes/ Migrations/ Tests/ Resources/Private/
diff --git a/.woodpecker/test.yml b/.woodpecker/test.yml
new file mode 100644
index 0000000..cdf520b
--- /dev/null
+++ b/.woodpecker/test.yml
@@ -0,0 +1,46 @@
+workspace:
+  base: /woodpecker
+  path: package
+
+matrix:
+  FLOW_VERSION:
+    - 4.3
+    - 5.3
+
+pipeline:
+  functional-tests:
+    image: thecodingmachine/php:7.4-v4-cli
+    environment:
+      # Enable the PDO_SQLITE extension
+      - "PHP_EXTENSION_PDO_SQLITE=1"
+      - "FLOW_VERSION=${FLOW_VERSION}"
+      - "NEOS_BUILD_DIR=/woodpecker/Build-${FLOW_VERSION}"
+    commands:
+      - "sudo mkdir $NEOS_BUILD_DIR"
+      - "sudo chown -R docker:docker $NEOS_BUILD_DIR"
+      - "cd $NEOS_BUILD_DIR"
+      - "if [ \"$FLOW_VERSION\" = \"4.3\" ]; then sudo composer self-update --1; fi"
+      - "composer create-project --no-install neos/flow-base-distribution:^$FLOW_VERSION ."
+      - "composer config repositories.repo-name path /woodpecker/package"
+      - "composer remove --dev neos/behat"
+      - "if [ \"$FLOW_VERSION\" = \"4.3\" ]; then composer require typo3fluid/fluid:2.4.3; fi"
+      - "composer require digicomp/settingvalidator:@dev"
+      - |
+          if [ "$FLOW_VERSION" = "4.3" ]; then 
+            echo 'Neos:
+              Flow:
+                persistence:
+                  backendOptions:
+                    dbname: "flow_functional_testing"
+                error:
+                  errorHandler:
+                    exceptionalErrors:
+                      0: "%E_USER_ERROR%"
+                      1: "%E_RECOVERABLE_ERROR%"
+                      2: ~
+                      3: "%E_NOTICE%"
+                      4: "%E_USER_WARNING%"
+                      5: "%E_USER_NOTICE%"
+                      6: "%E_STRICT%"' > Configuration/Testing/Settings.yaml
+          fi
+      - "bin/phpunit --configuration Build/BuildEssentials/PhpUnit/FunctionalTests.xml Packages/Application/DigiComp.SettingValidator/Tests/Functional"
diff --git a/Classes/Validation/Validator/SettingsValidator.php b/Classes/Validation/Validator/SettingsValidator.php
index 5e005ef..ea3f6a4 100644
--- a/Classes/Validation/Validator/SettingsValidator.php
+++ b/Classes/Validation/Validator/SettingsValidator.php
@@ -28,8 +28,8 @@ use Neos\Utility\TypeHandling;
 class SettingsValidator extends AbstractValidator
 {
     /**
-     * @var ValidatorResolver
      * @Flow\Inject
+     * @var ValidatorResolver
      */
     protected $validatorResolver;
 
@@ -39,9 +39,9 @@ class SettingsValidator extends AbstractValidator
     protected $configurationManager;
 
     /**
-     * @var ReflectionService
      * @Flow\Inject
      * @deprecated
+     * @var ReflectionService
      */
     protected $reflectionService;
 
@@ -54,7 +54,7 @@ class SettingsValidator extends AbstractValidator
             ['Default'],
             'Same as "Validation Groups" of Flow Framework. Defines the groups to execute.',
             'array',
-            false
+            false,
         ],
     ];
 
@@ -107,7 +107,7 @@ class SettingsValidator extends AbstractValidator
 
             if (! $validator) {
                 throw new InvalidValidationConfigurationException(
-                    sprintf(
+                    \sprintf(
                         'Validator could not be resolved: "%s" Check your Validation.yaml',
                         $validatorConfig['validator']
                     ),
@@ -135,7 +135,7 @@ class SettingsValidator extends AbstractValidator
         $config = [];
         if (isset($this->validations[$name]['self'])) {
             foreach ($this->validations[$name]['self'] as $validator => &$validation) {
-                if (is_null($validation)) {
+                if ($validation === null) {
                     continue;
                 }
                 $newValidation['options'] = $validation;
@@ -146,7 +146,7 @@ class SettingsValidator extends AbstractValidator
         if (isset($this->validations[$name]['properties'])) {
             foreach ($this->validations[$name]['properties'] as $propertyName => &$validation) {
                 foreach ($validation as $validator => &$options) {
-                    if (is_null($options)) {
+                    if ($options === null) {
                         continue;
                     }
                     $newValidation['property'] = $propertyName;
@@ -168,7 +168,10 @@ class SettingsValidator extends AbstractValidator
      */
     protected function doesValidationGroupsMatch(array &$validatorConfig)
     {
-        if (isset($validatorConfig['options']['validationGroups']) && empty(array_intersect($validatorConfig['options']['validationGroups'], $this->options['validationGroups']))) {
+        if (
+            isset($validatorConfig['options']['validationGroups'])
+            && \array_intersect($validatorConfig['options']['validationGroups'], $this->options['validationGroups']) === []
+        ) {
             return false;
         }
 
diff --git a/Migrations/Code/Version20170603120900.php b/Migrations/Code/Version20170603120900.php
index 33318b6..1ac9f1e 100644
--- a/Migrations/Code/Version20170603120900.php
+++ b/Migrations/Code/Version20170603120900.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace Neos\Flow\Core\Migrations;
 
 /*