installLayoutBuilder example

class FieldLayoutUninstallTest extends LayoutBuilderCompatibilityTestBase {

  /** * Ensures field layout can be uninstalled with layout builder enabled. */
  public function testFieldLayoutUninstall() {
    // Setup user schema so user hook uninstall hook doesn't break.     $this->installSchema('user', 'users_data');

    // Setup layout builder and same displays.     $this->installLayoutBuilder();

    // Ensure install hook can handle displays without a layout.     $this->container->get('module_installer')->install(['field_layout']);

    // Ensure uninstall hook can handle displays without a layout.     $this->container->get('module_installer')->uninstall(['field_layout']);
  }

}

public function testCompatibility() {
    // Ensure that the fields are shown.     $expected_fields = [
      'field field--name-name field--type-string field--label-hidden field__item',
      'field field--name-test-field-display-configurable field--type-boolean field--label-above',
      'clearfix text-formatted field field--name-test-display-configurable field--type-text field--label-above',
      'clearfix text-formatted field field--name-test-display-non-configurable field--type-text field--label-above',
      'clearfix text-formatted field field--name-test-display-multiple field--type-text field--label-above',
    ];
    $this->assertFieldAttributes($this->entity, $expected_fields);

    $this->installLayoutBuilder();

    // Without using Layout Builder for an override, the result has not changed.     $this->assertFieldAttributes($this->entity, $expected_fields);

    // Add a layout override.     $this->enableOverrides();
    $this->entity = $this->reloadEntity($this->entity);
    $this->entity->get(OverridesSectionStorage::FIELD_NAME)->appendSection(new Section('layout_onecol'));
    $this->entity->save();

    // The rendered entity has now changed. The non-configurable field is shown

'field field--name-test-field-display-configurable field--type-boolean field--label-above',
      'clearfix text-formatted field field--name-test-display-configurable field--type-text field--label-above',
      'clearfix text-formatted field field--name-test-display-non-configurable field--type-text field--label-above',
      'clearfix text-formatted field field--name-test-display-multiple field--type-text field--label-above',
    ];
    $this->assertFieldAttributes($this->entity, $expected_fields);
    $this->assertNotEmpty($this->cssSelect('.layout__region--first .field--name-test-display-configurable'));
    $this->assertNotEmpty($this->cssSelect('.layout__region--first .field--name-test-field-display-configurable'));
    $this->assertNotEmpty($this->cssSelect('.field--name-test-display-non-configurable'));
    $this->assertEmpty($this->cssSelect('.layout__region .field--name-test-display-non-configurable'));

    $this->installLayoutBuilder();

    // Without using Layout Builder for an override, the result has not changed.     $this->assertFieldAttributes($this->entity, $expected_fields);

    // Add a layout override.     $this->enableOverrides();
    /** @var \Drupal\layout_builder\SectionStorageInterface $field_list */
    $field_list = $this->entity->get(OverridesSectionStorage::FIELD_NAME);
    $field_list->appendSection(new Section('layout_onecol'));
    $this->entity->save();