--- /dev/null
+<?php
+
+namespace Drupal\Tests\layout_builder\Kernel;
+
+use Drupal\Core\Entity\Entity\EntityViewDisplay;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\KernelTests\Core\Entity\EntityKernelTestBase;
+
+/**
+ * Tests Layout Builder's compatibility with existing systems.
+ */
+abstract class LayoutBuilderCompatibilityTestBase extends EntityKernelTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = [
+ 'layout_discovery',
+ ];
+
+ /**
+ * The entity view display.
+ *
+ * @var \Drupal\field_layout\Display\EntityDisplayWithLayoutInterface
+ */
+ protected $display;
+
+ /**
+ * The entity being rendered.
+ *
+ * @var \Drupal\Core\Entity\FieldableEntityInterface
+ */
+ protected $entity;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+
+ $this->installEntitySchema('entity_test_base_field_display');
+ $this->installConfig(['filter']);
+ $this->installSchema('system', ['key_value_expire']);
+
+ // Set up a non-admin user that is allowed to view test entities.
+ \Drupal::currentUser()->setAccount($this->createUser(['uid' => 2], ['view test entity']));
+
+ \Drupal::service('theme_handler')->install(['classy']);
+ $this->config('system.theme')->set('default', 'classy')->save();
+
+ $field_storage = FieldStorageConfig::create([
+ 'entity_type' => 'entity_test_base_field_display',
+ 'field_name' => 'test_field_display_configurable',
+ 'type' => 'boolean',
+ ]);
+ $field_storage->save();
+ FieldConfig::create([
+ 'field_storage' => $field_storage,
+ 'bundle' => 'entity_test_base_field_display',
+ 'label' => 'FieldConfig with configurable display',
+ ])->save();
+
+ $this->display = EntityViewDisplay::create([
+ 'targetEntityType' => 'entity_test_base_field_display',
+ 'bundle' => 'entity_test_base_field_display',
+ 'mode' => 'default',
+ 'status' => TRUE,
+ ]);
+ $this->display
+ ->setComponent('test_field_display_configurable', ['weight' => 5])
+ ->save();
+
+ // Create an entity with fields that are configurable and non-configurable.
+ $entity_storage = $this->container->get('entity_type.manager')->getStorage('entity_test_base_field_display');
+ // @todo Remove langcode workarounds after resolving
+ // https://www.drupal.org/node/2915034.
+ $this->entity = $entity_storage->createWithSampleValues('entity_test_base_field_display', [
+ 'langcode' => 'en',
+ 'langcode_default' => TRUE,
+ ]);
+ $this->entity->save();
+ }
+
+ /**
+ * Installs the Layout Builder.
+ *
+ * Also configures and reloads the entity display, and reloads the entity.
+ */
+ protected function installLayoutBuilder() {
+ $this->container->get('module_installer')->install(['layout_builder']);
+ $this->refreshServices();
+
+ $this->display = $this->reloadEntity($this->display);
+ $this->display->setOverridable()->save();
+ $this->entity = $this->reloadEntity($this->entity);
+ }
+
+ /**
+ * Asserts that the rendered entity has the correct fields.
+ *
+ * @param \Drupal\Core\Entity\EntityInterface $entity
+ * The entity to render.
+ * @param array $attributes
+ * An array of field attributes to assert.
+ *
+ * @return string
+ * The rendered string output (typically HTML).
+ */
+ protected function assertFieldAttributes(EntityInterface $entity, array $attributes) {
+ $view_builder = $this->container->get('entity_type.manager')->getViewBuilder($entity->getEntityTypeId());
+ $build = $view_builder->view($entity);
+ $this->render($build);
+
+ $actual = array_map(function (\SimpleXMLElement $element) {
+ return (string) $element->attributes();
+ }, $this->cssSelect('.field'));
+ $this->assertSame($attributes, $actual);
+ }
+
+}