--- /dev/null
+<?php
+
+namespace Drupal\entityqueue_test\Plugin\EntityQueueHandler;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\entityqueue\EntityQueueHandlerBase;
+
+/**
+ * Defines an entity queue handler for testing.
+ *
+ * @EntityQueueHandler(
+ * id = "test",
+ * title = @Translation("Test handler")
+ * )
+ */
+class Test extends EntityQueueHandlerBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function supportsMultipleSubqueues() {
+ return TRUE;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function hasAutomatedSubqueues() {
+ return FALSE;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultConfiguration() {
+ return [
+ 'shape' => 'round',
+ ];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+ $form['shape'] = [
+ '#type' => 'textfield',
+ '#title' => 'Shape',
+ '#default_value' => $this->configuration['shape'],
+ ];
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
+ if ($form_state->getValue('shape') === 'square') {
+ $form_state->setErrorByName('shape', $this->t('The shape can not be square.'));
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+ $this->configuration['shape'] = $form_state->getValue('shape');
+ }
+
+}