Issue #3094476 by sleitner, gbyte.co: PHP 7.4 and Drupal 9 testing deprecation

src/Form/SimplesitemapEntitiesForm.php

@@ -115,7 +115,7 @@ class SimplesitemapEntitiesForm extends SimplesitemapFormBase {
         $indexed_bundles_string = '';
         if (isset($indexed_bundles[$entity_type_id])) {
           foreach ($indexed_bundles[$entity_type_id] as $bundle => $bundle_data) {
-            $indexed_bundles_string .= '<br><em>' . $bundle_data['bundle_label'] . '</em> <span class="description">(' . $this->t('sitemap variants') . ': <em>' . implode($bundle_data['variants'], ', ') . '</em>)</span>';
+            $indexed_bundles_string .= '<br><em>' . $bundle_data['bundle_label'] . '</em> <span class="description">(' . $this->t('sitemap variants') . ': <em>' . implode(', ', $bundle_data['variants']) . '</em>)</span>';
           }
         }
 

tests/src/Functional/SimplesitemapTestBase.php

@@ -61,6 +61,20 @@ abstract class SimplesitemapTestBase extends BrowserTestBase {
 
   protected $defaultSitemapUrl = 'sitemap.xml';
 
+  /**
+   * Use the testing profile.
+   *
+   * @var string
+   */
+  protected $profile = 'testing';
+
+  /**
+   * Use the classy theme.
+   *
+   * @var string
+   */
+  protected $defaultTheme = 'classy';
+
   /**
    * {@inheritdoc}
    */