bug: schema for filters

config/install/env_link_fixer.settings.yml

 mapping: ''
+domain_names: ''

config/schema/env_link_fixer.schema.yml

@@ -5,6 +5,11 @@ env_link_fixer.settings:
     mapping:
       type: string
       label: 'Mapping'
+
+filter_settings.env_link_fixer_strip_domain:
+  type: mapping
+  label: 'Convert absolute URLs to relative for some domains'
+  mapping:
     domain_names:
       type: string
-      label: 'Domain names'
+      label: 'Domain names'
\ No newline at end of file

src/Plugin/Filter/RewriteOwnDomainLinks.php

@@ -3,7 +3,6 @@
 namespace Drupal\env_link_fixer\Plugin\Filter;
 
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Render\Markup;
 use Drupal\filter\FilterProcessResult;
 use Drupal\filter\Plugin\FilterBase;
 
@@ -19,6 +18,13 @@ use Drupal\filter\Plugin\FilterBase;
  */
 class RewriteOwnDomainLinks extends FilterBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  public $settings = [
+    'domain_names' => '',
+  ];
+
   /**
    * {@inheritdoc}
    */

tests/src/Kernel/TestBase.php

@@ -3,9 +3,9 @@
 namespace Drupal\Tests\env_link_fixer\Kernel;
 
 use Drupal\Core\Entity\Entity\EntityViewDisplay;
+use Drupal\Tests\field\Kernel\FieldKernelTestBase;
 use Drupal\field\Entity\FieldConfig;
 use Drupal\field\Entity\FieldStorageConfig;
-use Drupal\Tests\field\Kernel\FieldKernelTestBase;
 
 /**
  * Common functions.
@@ -104,7 +104,7 @@ class TestBase extends FieldKernelTestBase {
   }
 
   /**
-   * fix data provider keys.
+   * Fix data provider keys.
    */
   protected function fixProviderKeys(string $prefix, array $tests) : array {
     $output = [];
@@ -114,4 +114,5 @@ class TestBase extends FieldKernelTestBase {
 
     return $output;
   }
+
 }