--- /dev/null
+<?php
+
+namespace Drupal\Tests\dblog\Kernel;
+
+
+use Drupal\Core\DependencyInjection\DependencySerializationTrait;
+use Drupal\Core\Form\FormInterface;
+use Drupal\Core\Form\FormState;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\user\Entity\User;
+
+/**
+ * Tests serializing a form with an injected dblog logger instance.
+ *
+ * @group dblog
+ */
+class DbLogFormInjectionTest extends KernelTestBase implements FormInterface {
+
+ use DependencySerializationTrait;
+
+ /**
+ * A Dblog logger instance.
+ *
+ * @var \Psr\Log\LoggerInterface
+ */
+ protected $logger;
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['system', 'dblog', 'user'];
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'dblog_test_injection_form';
+ }
+
+ /**
+ * Process callback.
+ *
+ * @param array $element
+ * Form element
+ *
+ * @return array
+ * Processed element.
+ */
+ public function process($element) {
+ return $element;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $form['#process'][] = [$this, 'process'];
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateForm(array &$form, FormStateInterface $form_state) {}
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $form_state->setRebuild();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ $this->installSchema('dblog', ['watchdog']);
+ $this->installSchema('system', ['key_value_expire', 'sequences']);
+ $this->installEntitySchema('user');
+ $this->logger = \Drupal::logger('test_logger');
+ $test_user = User::create([
+ 'name' => 'foobar',
+ 'mail' => 'foobar@example.com',
+ ]);
+ $test_user->save();
+ \Drupal::service('current_user')->setAccount($test_user);
+ }
+
+ /**
+ * Tests db log injection serialization.
+ */
+ public function testLoggerSerialization() {
+ $form_state = new FormState();
+
+ // Forms are only serialized during POST requests.
+ $form_state->setRequestMethod('POST');
+ $form_state->setCached();
+ $form_builder = $this->container->get('form_builder');
+ $form_id = $form_builder->getFormId($this, $form_state);
+ $form = $form_builder->retrieveForm($form_id, $form_state);
+ $form_builder->prepareForm($form_id, $form, $form_state);
+ $form_builder->processForm($form_id, $form, $form_state);
+ }
+
+}