Initial Drupal 11 with DDEV setup

web/core/modules/field_layout/tests/modules/field_layout_test/config/schema/field_layout_test.schema.yml

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+layout_plugin.settings.test_layout_main_and_footer:
+  type: layout_plugin.settings
+  label: 'Layout test plugin settings'
+  mapping:
+    setting_1:
+      type: string
+      label: 'Setting 1'

web/core/modules/field_layout/tests/modules/field_layout_test/field_layout_test.info.yml

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+name: 'Field Layout test'
+type: module
+description: 'Support module for Field Layout tests.'
+package: Testing
+version: VERSION
+dependencies:
+  - drupal:entity_test

web/core/modules/field_layout/tests/modules/field_layout_test/field_layout_test.routing.yml

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+entity.entity_test.test_view_mode:
+  path: '/entity_test/{entity_test}/test'
+  defaults:
+    _entity_view: 'entity_test.test'
+    _title: 'Test test view mode'
+  requirements:
+    _entity_access: 'entity_test.view'
+field_layout_test.embedded_form:
+  path: '/field-layout-embedded-form'
+  defaults:
+    _form: 'Drupal\field_layout_test\Form\EmbeddedForm'
+    _title: 'Embedded entity form'
+  requirements:
+    _permission: 'access administration pages'

web/core/modules/field_layout/tests/modules/field_layout_test/src/Form/EmbeddedForm.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\field_layout_test\Form;
+
+use Drupal\Core\Entity\Entity\EntityFormDisplay;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Form\SubformState;
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\field_layout\FieldLayoutBuilder;
+
+/**
+ * Provides the EmbeddedForm class.
+ *
+ * @package Drupal\field_layout_test\Form
+ */
+class EmbeddedForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'field_layout_test_embedded_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['foo'] = [
+      '#type' => 'fieldset',
+      '#title' => $this->t('Wrapper'),
+      '#tree' => TRUE,
+      '#parents' => ['foo'],
+    ];
+    $entity = EntityTest::load(1);
+    if ($entity) {
+      if ($entity) {
+        $display = EntityFormDisplay::collectRenderDisplay($entity, 'default');
+        $subform_state = SubformState::createForSubform($form['foo'], $form, $form_state);
+        $display->buildForm($entity, $form['foo'], $subform_state);
+        \Drupal::classResolver(FieldLayoutBuilder::class)->buildForm($form['foo'], $display, $subform_state);
+      }
+    }
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Do nothing.
+  }
+
+}

web/core/modules/field_layout/tests/modules/field_layout_test/src/Hook/FieldLayoutTestHooks.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\field_layout_test\Hook;
+
+use Drupal\Core\Hook\Attribute\Hook;
+
+/**
+ * Hook implementations for field_layout_test.
+ */
+class FieldLayoutTestHooks {
+
+  /**
+   * Implements hook_layout_alter().
+   */
+  #[Hook('layout_alter')]
+  public function layoutAlter(&$definitions): void {
+    /** @var \Drupal\Core\Layout\LayoutDefinition[] $definitions */
+    if (\Drupal::state()->get('field_layout_test.alter_regions') && isset($definitions['layout_onecol'])) {
+      $definitions['layout_onecol']->setRegions(['foo' => ['label' => 'Foo']]);
+    }
+  }
+
+}

web/core/modules/field_layout/tests/modules/field_layout_test/src/Plugin/Layout/TestLayoutContentFooter.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\field_layout_test\Plugin\Layout;
+
+use Drupal\Core\Layout\Attribute\Layout;
+use Drupal\Core\Layout\LayoutDefault;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+
+/**
+ * Provides a Layout plugin for field_layout tests.
+ */
+#[Layout(
+  id: 'test_layout_content_and_footer',
+  label: new TranslatableMarkup('Test plugin: Content and Footer'),
+  category: new TranslatableMarkup('Layout test'),
+  description: new TranslatableMarkup('Test layout'),
+  regions: [
+    "content" => [
+      "label" => new TranslatableMarkup("Content Region"),
+    ],
+    "footer" => [
+      "label" => new TranslatableMarkup("Footer Region"),
+    ],
+  ],
+)]
+class TestLayoutContentFooter extends LayoutDefault {
+
+}

web/core/modules/field_layout/tests/modules/field_layout_test/src/Plugin/Layout/TestLayoutMainFooter.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\field_layout_test\Plugin\Layout;
+
+use Drupal\Core\Layout\Attribute\Layout;
+use Drupal\Core\Layout\LayoutDefault;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+
+/**
+ * Provides an attributed layout plugin for field_layout tests.
+ */
+#[Layout(
+  id: 'test_layout_main_and_footer',
+  label: new TranslatableMarkup('Test plugin: Main and Footer'),
+  category: new TranslatableMarkup('Layout test'),
+  description: new TranslatableMarkup('Test layout'),
+  regions: [
+    "main" => [
+      "label" => new TranslatableMarkup("Main Region"),
+    ],
+    "footer" => [
+      "label" => new TranslatableMarkup("Footer Region"),
+    ],
+  ],
+  config_dependencies: [
+    "module" => [
+      "layout_discovery",
+    ],
+  ],
+)]
+class TestLayoutMainFooter extends LayoutDefault {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'setting_1' => 'Default',
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateDependencies() {
+    $dependencies = parent::calculateDependencies();
+    $dependencies['module'][] = 'system';
+    return $dependencies;
+  }
+
+}

web/core/modules/field_layout/tests/src/Functional/FieldLayoutTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\field_layout\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests using field layout for entity displays.
+ *
+ * @group field_layout
+ */
+class FieldLayoutTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'field_layout',
+    'field_ui',
+    'node',
+    'field_layout_test',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    $this->createContentType([
+      'type' => 'article',
+    ]);
+    $this->createNode([
+      'type' => 'article',
+      'title' => 'The node title',
+      'body' => [
+        ['value' => 'The node body'],
+      ],
+    ]);
+    $this->drupalLogin($this->drupalCreateUser([
+      'access administration pages',
+      'administer content types',
+      'administer nodes',
+      'administer node fields',
+      'administer node display',
+      'administer node form display',
+      'view the administration theme',
+    ]));
+  }
+
+  /**
+   * Tests an entity type that has fields shown by default.
+   */
+  public function testNodeView(): void {
+    // By default, the one-column layout is used.
+    $this->drupalGet('node/1');
+    $this->assertSession()->elementExists('css', '.layout--onecol');
+    $this->assertSession()->elementTextContains('css', '.layout__region--content', 'The node body');
+
+    $this->drupalGet('admin/structure/types/manage/article/display');
+    $this->assertEquals(['Content', 'Disabled'], $this->getRegionTitles());
+    $this->assertSession()->optionExists('fields[body][region]', 'content');
+  }
+
+  /**
+   * Tests that changes to the regions still leave the fields visible.
+   */
+  public function testRegionChanges(): void {
+    $this->drupalGet('admin/structure/types/manage/article/display');
+    $this->assertEquals(['Content', 'Disabled'], $this->getRegionTitles());
+    $this->assertSession()->optionExists('fields[body][region]', 'content');
+
+    \Drupal::state()->set('field_layout_test.alter_regions', TRUE);
+    \Drupal::service('plugin.cache_clearer')->clearCachedDefinitions();
+
+    $this->drupalGet('admin/structure/types/manage/article/display');
+    $this->assertEquals(['Foo', 'Disabled'], $this->getRegionTitles());
+    $this->assertSession()->optionExists('fields[body][region]', 'hidden');
+  }
+
+  /**
+   * Gets the region titles on the page.
+   *
+   * @return string[]
+   *   An array of region titles.
+   */
+  protected function getRegionTitles(): array {
+    $region_titles = [];
+    $region_title_elements = $this->getSession()->getPage()->findAll('css', '.region-title td');
+    /** @var \Behat\Mink\Element\NodeElement[] $region_title_elements */
+    foreach ($region_title_elements as $region_title_element) {
+      $region_titles[] = $region_title_element->getText();
+    }
+    return $region_titles;
+  }
+
+}

web/core/modules/field_layout/tests/src/Functional/GenericTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\field_layout\Functional;
+
+use Drupal\Tests\system\Functional\Module\GenericModuleTestBase;
+
+/**
+ * Generic module test for field_layout.
+ *
+ * @group field_layout
+ */
+class GenericTest extends GenericModuleTestBase {}

web/core/modules/field_layout/tests/src/FunctionalJavascript/FieldLayoutTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\field_layout\FunctionalJavascript;
+
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
+
+/**
+ * Tests using field layout for entity displays.
+ *
+ * @group field_layout
+ */
+class FieldLayoutTest extends WebDriverTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'field_layout',
+    'field_ui',
+    'field_layout_test',
+    'layout_test',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    $entity = EntityTest::create([
+      'name' => 'The name for this entity',
+      'field_test_text' => [
+        ['value' => 'The field test text value'],
+      ],
+    ]);
+    $entity->save();
+    $this->drupalLogin($this->drupalCreateUser([
+      'access administration pages',
+      'view test entity',
+      'administer entity_test content',
+      'administer entity_test fields',
+      'administer entity_test display',
+      'administer entity_test form display',
+      'view the administration theme',
+    ]));
+  }
+
+  /**
+   * Tests that layouts are unique per view mode.
+   */
+  public function testEntityViewModes(): void {
+    // By default, the field is not visible.
+    $this->drupalGet('entity_test/1/test');
+    $this->assertSession()->elementNotExists('css', '.layout__region--content ');
+    $this->drupalGet('entity_test/1');
+    $this->assertSession()->elementNotExists('css', '.layout__region--content');
+
+    // Change the layout for the "test" view mode. See
+    // core.entity_view_mode.entity_test.test.yml.
+    $this->drupalGet('entity_test/structure/entity_test/display');
+    $this->click('#edit-modes');
+    $this->getSession()->getPage()->checkField('display_modes_custom[test]');
+    $this->submitForm([], 'Save');
+    $this->clickLink('configure them');
+    $this->getSession()->getPage()->pressButton('Show row weights');
+    $this->getSession()->getPage()->selectFieldOption('fields[field_test_text][region]', 'content');
+    $this->submitForm([], 'Save');
+
+    // Each view mode has a different layout.
+    $this->drupalGet('entity_test/1/test');
+    $this->assertSession()->elementTextContains('css', '.layout__region--content', 'The field test text value');
+    $this->drupalGet('entity_test/1');
+    $this->assertSession()->elementNotExists('css', '.layout__region--content');
+  }
+
+  /**
+   * Tests the use of field layout for entity form displays.
+   */
+  public function testEntityForm(): void {
+    // By default, the one-column layout is used.
+    $this->drupalGet('entity_test/manage/1/edit');
+    $this->assertFieldInRegion('field_test_text[0][value]', 'content');
+
+    // The one-column layout is in use.
+    $this->drupalGet('entity_test/structure/entity_test/form-display');
+    $this->assertEquals(['Content', 'Disabled'], $this->getRegionTitles());
+
+    // Switch the layout to two columns.
+    $this->click('#edit-field-layouts');
+    $this->getSession()->getPage()->selectFieldOption('field_layout', 'layout_twocol');
+    $this->assertSession()->assertWaitOnAjaxRequest();
+    $this->submitForm([], 'Save');
+
+    // The field is moved to the default region for the new layout.
+    $this->assertSession()->pageTextContains('Your settings have been saved.');
+    $this->assertEquals(['Top', 'First', 'Second', 'Bottom', 'Disabled'], $this->getRegionTitles());
+
+    $this->drupalGet('entity_test/manage/1/edit');
+    // No fields are visible, and the regions don't display when empty.
+    $this->assertFieldInRegion('field_test_text[0][value]', 'first');
+    $this->assertSession()->elementExists('css', '.layout__region--first .field--name-field-test-text');
+
+    // After a refresh the new regions are still there.
+    $this->drupalGet('entity_test/structure/entity_test/form-display');
+    $this->assertEquals(['Top', 'First', 'Second', 'Bottom', 'Disabled'], $this->getRegionTitles());
+    $this->assertSession()->waitForElement('css', '.tabledrag-handle');
+    $id = $this->getSession()->getPage()->find('css', '[name="form_build_id"]')->getValue();
+
+    // Drag the field to the second region.
+    $field_test_text_row = $this->getSession()->getPage()->find('css', '#field-test-text');
+    $second_region_row = $this->getSession()->getPage()->find('css', '.region-second-message');
+    $field_test_text_row->find('css', '.handle')->dragTo($second_region_row);
+    $this->assertSession()->assertWaitOnAjaxRequest();
+    $this->assertSession()->waitForElement('css', "[name='form_build_id']:not([value='$id'])");
+    $this->submitForm([], 'Save');
+    $this->assertSession()->pageTextContains('Your settings have been saved.');
+
+    // The new layout is used.
+    $this->drupalGet('entity_test/manage/1/edit');
+    $this->assertSession()->elementExists('css', '.layout__region--second .field--name-field-test-text');
+    $this->assertFieldInRegion('field_test_text[0][value]', 'second');
+
+    // Tests if this layout works in an embedded context.
+    $this->drupalGet('/field-layout-embedded-form');
+    $this->assertSession()->elementExists('css', '.layout__region--second .field--name-field-test-text');
+    $this->assertFieldInRegion('foo[field_test_text][0][value]', 'second');
+
+    // Move the field to the second region without tabledrag.
+    $this->drupalGet('entity_test/structure/entity_test/form-display');
+    $this->getSession()->getPage()->pressButton('Show row weights');
+    $this->getSession()->getPage()->selectFieldOption('fields[field_test_text][region]', 'second');
+    $this->submitForm([], 'Save');
+    $this->assertSession()->pageTextContains('Your settings have been saved.');
+
+    // The updated region is used.
+    $this->drupalGet('entity_test/manage/1/edit');
+    $this->assertFieldInRegion('field_test_text[0][value]', 'second');
+
+    // The layout is still in use without Field UI.
+    $this->container->get('module_installer')->uninstall(['field_ui']);
+    $this->drupalGet('entity_test/manage/1/edit');
+    $this->assertFieldInRegion('field_test_text[0][value]', 'second');
+  }
+
+  /**
+   * Tests the use of field layout for entity view displays.
+   */
+  public function testEntityView(): void {
+    // The one-column layout is in use.
+    $this->drupalGet('entity_test/structure/entity_test/display');
+    $this->assertEquals(['Content', 'Disabled'], $this->getRegionTitles());
+
+    // Switch the layout to two columns.
+    $this->click('#edit-field-layouts');
+    $this->getSession()->getPage()->selectFieldOption('field_layout', 'layout_twocol');
+    $this->assertSession()->assertWaitOnAjaxRequest();
+    $this->submitForm([], 'Save');
+
+    $this->assertSession()->pageTextContains('Your settings have been saved.');
+    $this->assertEquals(['Top', 'First', 'Second', 'Bottom', 'Disabled'], $this->getRegionTitles());
+
+    $this->drupalGet('entity_test/1');
+    // No fields are visible, and the regions don't display when empty.
+    $this->assertSession()->elementNotExists('css', '.layout--twocol');
+    $this->assertSession()->elementNotExists('css', '.layout__region');
+    $this->assertSession()->pageTextNotContains('The field test text value');
+
+    // After a refresh the new regions are still there.
+    $this->drupalGet('entity_test/structure/entity_test/display');
+    $this->assertEquals(['Top', 'First', 'Second', 'Bottom', 'Disabled'], $this->getRegionTitles());
+    $this->assertSession()->waitForElement('css', '.tabledrag-handle');
+    $id = $this->getSession()->getPage()->find('css', '[name="form_build_id"]')->getValue();
+
+    // Drag the field to the first region.
+    $this->assertTrue($this->assertSession()->optionExists('fields[field_test_text][region]', 'hidden')->isSelected());
+    $field_test_text_row = $this->getSession()->getPage()->find('css', '#field-test-text');
+    $first_region_row = $this->getSession()->getPage()->find('css', '.region-first-message');
+    $field_test_text_row->find('css', '.handle')->dragTo($first_region_row);
+    $this->assertSession()->assertWaitOnAjaxRequest();
+    $this->assertFalse($this->assertSession()->optionExists('fields[field_test_text][region]', 'hidden')->isSelected());
+    $this->assertSession()->waitForElement('css', "[name='form_build_id']:not([value='$id'])");
+    $this->submitForm([], 'Save');
+    $this->assertSession()->pageTextContains('Your settings have been saved.');
+
+    // The new layout is used.
+    $this->drupalGet('entity_test/1');
+    $this->assertSession()->elementExists('css', '.layout--twocol');
+    $this->assertSession()->elementTextContains('css', '.layout__region--first', 'The field test text value');
+
+    // Move the field to the second region without tabledrag.
+    $this->drupalGet('entity_test/structure/entity_test/display');
+    $this->getSession()->getPage()->pressButton('Show row weights');
+    $this->getSession()->getPage()->selectFieldOption('fields[field_test_text][region]', 'second');
+    $this->submitForm([], 'Save');
+    $this->assertSession()->pageTextContains('Your settings have been saved.');
+
+    // The updated region is used.
+    $this->drupalGet('entity_test/1');
+    $this->assertSession()->elementTextContains('css', '.layout__region--second', 'The field test text value');
+
+    // The layout is still in use without Field UI.
+    $this->container->get('module_installer')->uninstall(['field_ui']);
+    $this->drupalGet('entity_test/1');
+    $this->assertSession()->elementExists('css', '.layout--twocol');
+    $this->assertSession()->elementTextContains('css', '.layout__region--second', 'The field test text value');
+  }
+
+  /**
+   * Tests layout plugins with forms.
+   */
+  public function testLayoutForms(): void {
+    $this->drupalGet('entity_test/structure/entity_test/display');
+    // Switch to a field layout with settings.
+    $this->click('#edit-field-layouts');
+
+    // Test switching between layouts with and without forms.
+    $this->getSession()->getPage()->selectFieldOption('field_layout', 'layout_test_plugin');
+    $this->assertSession()->assertExpectedAjaxRequest(1);
+    $this->assertSession()->fieldExists('settings_wrapper[layout_settings][setting_1]');
+
+    $this->getSession()->getPage()->selectFieldOption('field_layout', 'layout_test_2col');
+    $this->assertSession()->assertExpectedAjaxRequest(2);
+    $this->assertSession()->fieldNotExists('settings_wrapper[layout_settings][setting_1]');
+
+    $this->getSession()->getPage()->selectFieldOption('field_layout', 'layout_test_plugin');
+    $this->assertSession()->assertExpectedAjaxRequest(3);
+    $this->assertSession()->fieldExists('settings_wrapper[layout_settings][setting_1]');
+
+    // Move the test field to the content region.
+    $this->getSession()->getPage()->pressButton('Show row weights');
+    $this->getSession()->getPage()->selectFieldOption('fields[field_test_text][region]', 'content');
+    $this->submitForm([], 'Save');
+
+    $this->drupalGet('entity_test/1');
+    $this->assertSession()->pageTextContains('Blah: Default');
+
+    // Update the field layout settings.
+    $this->drupalGet('entity_test/structure/entity_test/display');
+    $this->click('#edit-field-layouts');
+    $this->getSession()->getPage()->fillField('settings_wrapper[layout_settings][setting_1]', 'Test text');
+    $this->submitForm([], 'Save');
+
+    $this->drupalGet('entity_test/1');
+    $this->assertSession()->pageTextContains('Blah: Test text');
+  }
+
+  /**
+   * Tests changing the formatter and region at the same time.
+   */
+  public function testChangingFormatterAndRegion(): void {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+
+    // Add the test field to the content region.
+    $this->drupalGet('entity_test/structure/entity_test/display');
+    $page->find('css', '#field-test-text .handle')->dragTo($page->find('css', '.region-content-message'));
+    $assert_session->assertWaitOnAjaxRequest();
+    $page->pressButton('Save');
+    $assert_session->fieldValueEquals('fields[field_test_text][region]', 'content');
+    $assert_session->fieldValueEquals('fields[field_test_text][type]', 'text_default');
+
+    // Switch the layout to two columns.
+    $this->click('#edit-field-layouts');
+    $page->selectFieldOption('field_layout', 'layout_twocol');
+    $assert_session->assertWaitOnAjaxRequest();
+    $page->pressButton('Save');
+    $assert_session->fieldValueEquals('fields[field_test_text][region]', 'first');
+
+    // Change the formatter and move to another region.
+    $page->selectFieldOption('fields[field_test_text][type]', 'text_trimmed');
+    $assert_session->assertWaitOnAjaxRequest();
+    $page->find('css', '#field-test-text .handle')->dragTo($page->find('css', '.region-second-message'));
+    $assert_session->assertWaitOnAjaxRequest();
+    $page->pressButton('Save');
+
+    // Assert that both the formatter and region change are persisted.
+    $assert_session->fieldValueEquals('fields[field_test_text][region]', 'second');
+    $assert_session->fieldValueEquals('fields[field_test_text][type]', 'text_trimmed');
+  }
+
+  /**
+   * Gets the region titles on the page.
+   *
+   * @return string[]
+   *   An array of region titles.
+   */
+  protected function getRegionTitles(): array {
+    $region_titles = [];
+    $region_title_elements = $this->getSession()->getPage()->findAll('css', '.region-title td');
+    /** @var \Behat\Mink\Element\NodeElement[] $region_title_elements */
+    foreach ($region_title_elements as $region_title_element) {
+      $region_titles[] = $region_title_element->getText();
+    }
+    return $region_titles;
+  }
+
+  /**
+   * Asserts that a field exists in a given region.
+   *
+   * @param string $field_selector
+   *   The field selector, one of field id|name|label|value.
+   * @param string $region_name
+   *   The machine name of the region.
+   *
+   * @internal
+   */
+  protected function assertFieldInRegion(string $field_selector, string $region_name): void {
+    $region_element = $this->getSession()->getPage()->find('css', ".layout__region--$region_name");
+    $this->assertNotNull($region_element);
+    $this->assertSession()->fieldExists($field_selector, $region_element);
+  }
+
+}

web/core/modules/field_layout/tests/src/Kernel/FieldLayoutEntityDisplayTest.php

@@ -0,0 +1,198 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\field_layout\Kernel;
+
+use Drupal\field_layout\Entity\FieldLayoutEntityViewDisplay;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * @coversDefaultClass \Drupal\field_layout\Entity\FieldLayoutEntityDisplayTrait
+ * @group field_layout
+ */
+class FieldLayoutEntityDisplayTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'layout_discovery',
+    'field_layout',
+    'entity_test',
+    'field_layout_test',
+    'field_test',
+    'system',
+  ];
+
+  /**
+   * @covers ::preSave
+   * @covers ::calculateDependencies
+   */
+  public function testPreSave(): void {
+    // Create an entity display with one hidden and one visible field.
+    $entity_display = FieldLayoutEntityViewDisplay::create([
+      'targetEntityType' => 'entity_test',
+      'bundle' => 'entity_test',
+      'mode' => 'default',
+      'status' => TRUE,
+      'content' => [
+        'foo' => ['type' => 'field_no_settings'],
+        'name' => ['type' => 'hidden', 'region' => 'content'],
+      ],
+      'hidden' => [
+        'bar' => TRUE,
+      ],
+    ]);
+
+    $expected = [
+      'langcode' => 'en',
+      'status' => TRUE,
+      'dependencies' => [],
+      'third_party_settings' => [
+        'field_layout' => [
+          'id' => 'layout_onecol',
+          'settings' => [
+            'label' => '',
+          ],
+        ],
+      ],
+      'id' => 'entity_test.entity_test.default',
+      'targetEntityType' => 'entity_test',
+      'bundle' => 'entity_test',
+      'mode' => 'default',
+      'content' => [
+        'foo' => [
+          'type' => 'field_no_settings',
+        ],
+      ],
+      'hidden' => [
+        'bar' => TRUE,
+      ],
+    ];
+    $this->assertEntityValues($expected, $entity_display->toArray());
+
+    // Save the display.
+    // the 'content' property and the visible field has the default region set.
+    $entity_display->save();
+
+    // The dependencies have been updated.
+    $expected['dependencies']['module'] = [
+      'entity_test',
+      'field_layout',
+      'layout_discovery',
+    ];
+    // A third party setting is added by the entity_test module.
+    $expected['third_party_settings']['entity_test'] = ['foo' => 'bar'];
+    // The visible field is assigned the default region.
+    $expected['content']['foo']['region'] = 'content';
+
+    $this->assertEntityValues($expected, $entity_display->toArray());
+
+    // Assign a new layout that has default settings and complex dependencies,
+    // but do not save yet.
+    $entity_display->setLayoutId('test_layout_main_and_footer');
+
+    // The default settings were added.
+    $expected['third_party_settings']['field_layout'] = [
+      'id' => 'test_layout_main_and_footer',
+      'settings' => [
+        'setting_1' => 'Default',
+      ],
+    ];
+    // The field was moved to the default region.
+    $expected['content']['foo'] = [
+      'type' => 'field_no_settings',
+      'region' => 'main',
+      'weight' => -4,
+      'settings' => [],
+      'third_party_settings' => [],
+    ];
+    $this->assertEntityValues($expected, $entity_display->toArray());
+
+    // After saving, the dependencies have been updated.
+    $entity_display->save();
+    $expected['dependencies']['module'] = [
+      'entity_test',
+      'field_layout',
+      'field_layout_test',
+      'layout_discovery',
+      'system',
+    ];
+    $this->assertEntityValues($expected, $entity_display->toArray());
+
+    // Assign a layout with provided settings.
+    $entity_display->setLayoutId('test_layout_main_and_footer', ['setting_1' => 'foobar']);
+    $entity_display->save();
+
+    // The setting overrides the default value.
+    $expected['third_party_settings']['field_layout']['settings']['setting_1'] = 'foobar';
+    $this->assertEntityValues($expected, $entity_display->toArray());
+
+    // Move a field to the non-default region.
+    $component = $entity_display->getComponent('foo');
+    $component['region'] = 'footer';
+    $entity_display->setComponent('foo', $component);
+    $entity_display->save();
+
+    // The field region is saved.
+    $expected['content']['foo']['region'] = 'footer';
+    $this->assertEntityValues($expected, $entity_display->toArray());
+
+    // Assign a different layout that shares the same non-default region.
+    $entity_display->setLayoutId('test_layout_content_and_footer');
+    $entity_display->save();
+
+    // The dependencies have been updated.
+    $expected['dependencies']['module'] = [
+      'entity_test',
+      'field_layout',
+      'field_layout_test',
+    ];
+    // The layout has been updated.
+    $expected['third_party_settings']['field_layout'] = [
+      'id' => 'test_layout_content_and_footer',
+      'settings' => [
+        'label' => '',
+      ],
+    ];
+    // The field remains in its current region instead of moving to the default.
+    $this->assertEntityValues($expected, $entity_display->toArray());
+
+    $this->container->get('module_installer')->uninstall(['field_layout']);
+
+    $entity_storage = $this->container->get('entity_type.manager')->getStorage('entity_view_display');
+    $entity_display = $entity_storage->load('entity_test.entity_test.default');
+
+    // The dependencies have been updated.
+    $expected['dependencies']['module'] = [
+      'entity_test',
+    ];
+    // All field_layout settings were removed.
+    unset($expected['third_party_settings']['field_layout']);
+    // The field has returned to the default content region.
+    $expected['content']['foo']['region'] = 'content';
+    $this->assertEntityValues($expected, $entity_display->toArray());
+  }
+
+  /**
+   * Asserts than an entity has the correct values.
+   *
+   * @param array $expected
+   *   The expected values.
+   * @param array $values
+   *   The actual values.
+   * @param string $message
+   *   (optional) An error message.
+   *
+   * @internal
+   */
+  public static function assertEntityValues(array $expected, array $values, string $message = ''): void {
+
+    static::assertArrayHasKey('uuid', $values);
+    unset($values['uuid']);
+
+    static::assertEquals($expected, $values, $message);
+  }
+
+}

web/core/modules/field_layout/tests/src/Kernel/FieldLayoutUninstallTest.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\field_layout\Kernel;
+
+use Drupal\Tests\layout_builder\Kernel\LayoutBuilderCompatibilityTestBase;
+
+/**
+ * @group field_layout
+ */
+class FieldLayoutUninstallTest extends LayoutBuilderCompatibilityTestBase {
+
+  /**
+   * Ensures field layout can be uninstalled with layout builder enabled.
+   */
+  public function testFieldLayoutUninstall(): void {
+    // 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']);
+  }
+
+}

web/core/modules/field_layout/tests/src/Unit/FieldLayoutBuilderTest.php

@@ -0,0 +1,344 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\field_layout\Unit;
+
+use Drupal\Core\Entity\EntityFieldManagerInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\field_layout\Display\EntityDisplayWithLayoutInterface;
+use Drupal\field_layout\FieldLayoutBuilder;
+use Drupal\Core\Layout\LayoutPluginManagerInterface;
+use Drupal\Core\Layout\LayoutDefault;
+use Drupal\Core\Layout\LayoutDefinition;
+use Drupal\Tests\UnitTestCase;
+use Prophecy\Argument;
+
+/**
+ * @coversDefaultClass \Drupal\field_layout\FieldLayoutBuilder
+ * @group field_layout
+ */
+class FieldLayoutBuilderTest extends UnitTestCase {
+
+  /**
+   * The layout plugin manager.
+   *
+   * @var \Drupal\Core\Layout\LayoutPluginManager|\Prophecy\Prophecy\ProphecyInterface
+   */
+  protected $layoutPluginManager;
+
+  /**
+   * The entity field manager.
+   *
+   * @var \Drupal\Core\Entity\EntityFieldManagerInterface|\Prophecy\Prophecy\ProphecyInterface
+   */
+  protected $entityFieldManager;
+
+  /**
+   * The field layout builder.
+   *
+   * @var \Drupal\field_layout\FieldLayoutBuilder
+   */
+  protected $fieldLayoutBuilder;
+
+  /**
+   * The layout plugin.
+   *
+   * @var \Drupal\Core\Layout\LayoutInterface
+   */
+  protected $layoutPlugin;
+
+  /**
+   * The layout plugin definition.
+   *
+   * @var \Drupal\Core\Layout\LayoutDefinition
+   */
+  protected $pluginDefinition;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    $this->pluginDefinition = new LayoutDefinition([
+      'library' => 'field_layout/drupal.layout.twocol',
+      'theme_hook' => 'layout__twocol',
+      'regions' => [
+        'left' => [
+          'label' => 'Left',
+        ],
+        'right' => [
+          'label' => 'Right',
+        ],
+      ],
+    ]);
+    $this->layoutPlugin = new LayoutDefault([], 'two_column', $this->pluginDefinition);
+
+    $this->layoutPluginManager = $this->prophesize(LayoutPluginManagerInterface::class);
+    $this->layoutPluginManager->getDefinition('unknown', FALSE)->willReturn(NULL);
+    $this->layoutPluginManager->getDefinition('two_column', FALSE)->willReturn($this->pluginDefinition);
+
+    $this->entityFieldManager = $this->prophesize(EntityFieldManagerInterface::class);
+
+    $this->fieldLayoutBuilder = new FieldLayoutBuilder($this->layoutPluginManager->reveal(), $this->entityFieldManager->reveal());
+  }
+
+  /**
+   * @covers ::buildView
+   * @covers ::getFields
+   */
+  public function testBuildView(): void {
+    $definitions = [];
+    $non_configurable_field_definition = $this->prophesize(FieldDefinitionInterface::class);
+    $non_configurable_field_definition->isDisplayConfigurable('view')->willReturn(FALSE);
+    $definitions['non_configurable_field'] = $non_configurable_field_definition->reveal();
+    $definitions['non_configurable_field_with_extra_field'] = $non_configurable_field_definition->reveal();
+    $this->entityFieldManager->getFieldDefinitions('the_entity_type_id', 'the_entity_type_bundle')->willReturn($definitions);
+    $extra_fields = [];
+    $extra_fields['non_configurable_field_with_extra_field'] = [
+      'label' => 'This non-configurable field is also defined in hook_entity_extra_field_info()',
+    ];
+    $this->entityFieldManager->getExtraFields('the_entity_type_id', 'the_entity_type_bundle')->willReturn($extra_fields);
+
+    $build = [
+      'test1' => [
+        '#markup' => 'Test1',
+      ],
+      'test2' => [
+        '#markup' => 'Test2',
+      ],
+      'non_configurable_field' => [
+        '#markup' => 'Non-configurable',
+      ],
+      'non_configurable_field_with_extra_field' => [
+        '#markup' => 'Non-configurable with extra field',
+      ],
+    ];
+
+    $display = $this->prophesize(EntityDisplayWithLayoutInterface::class);
+    $display->getTargetEntityTypeId()->willReturn('the_entity_type_id');
+    $display->getTargetBundle()->willReturn('the_entity_type_bundle');
+    $display->getLayout()->willReturn($this->layoutPlugin);
+    $display->getLayoutId()->willReturn('two_column');
+    $display->getLayoutSettings()->willReturn([]);
+    $display->getComponents()->willReturn([
+      'test1' => [
+        'region' => 'right',
+      ],
+      'test2' => [
+        'region' => 'unknown_region',
+      ],
+      'non_configurable_field' => [
+        'region' => 'left',
+      ],
+      'non_configurable_field_with_extra_field' => [
+        'region' => 'left',
+      ],
+    ]);
+
+    $expected = [
+      'test2' => [
+        '#markup' => 'Test2',
+      ],
+      'non_configurable_field' => [
+        '#markup' => 'Non-configurable',
+      ],
+      '_field_layout' => [
+        'left' => [
+          'non_configurable_field_with_extra_field' => [
+            '#markup' => 'Non-configurable with extra field',
+          ],
+        ],
+        'right' => [
+          'test1' => [
+            '#markup' => 'Test1',
+          ],
+        ],
+        '#in_preview' => FALSE,
+        '#settings' => [
+          'label' => '',
+        ],
+        '#layout' => $this->pluginDefinition,
+        '#theme' => 'layout__twocol',
+        '#attached' => [
+          'library' => [
+            'field_layout/drupal.layout.twocol',
+          ],
+        ],
+      ],
+    ];
+    $this->fieldLayoutBuilder->buildView($build, $display->reveal());
+    $this->assertEquals($expected, $build);
+    $this->assertSame($expected, $build);
+  }
+
+  /**
+   * @covers ::buildForm
+   * @covers ::getFields
+   */
+  public function testBuildForm(): void {
+    $definitions = [];
+    $non_configurable_field_definition = $this->prophesize(FieldDefinitionInterface::class);
+    $non_configurable_field_definition->isDisplayConfigurable('form')->willReturn(FALSE);
+    $definitions['non_configurable_field'] = $non_configurable_field_definition->reveal();
+    $this->entityFieldManager->getFieldDefinitions('the_entity_type_id', 'the_entity_type_bundle')->willReturn($definitions);
+    $this->entityFieldManager->getExtraFields('the_entity_type_id', 'the_entity_type_bundle')->willReturn([]);
+
+    $build = [
+      'test1' => [
+        '#markup' => 'Test1',
+      ],
+      'test2' => [
+        '#markup' => 'Test2',
+        '#group' => 'existing_group',
+      ],
+      'test3' => [
+        '#markup' => 'Test3',
+      ],
+      'field_layout' => [
+        '#markup' => 'Field created through the UI happens to be named "Layout"',
+      ],
+      'non_configurable_field' => [
+        '#markup' => 'Non-configurable',
+      ],
+    ];
+
+    $display = $this->prophesize(EntityDisplayWithLayoutInterface::class);
+    $display->getTargetEntityTypeId()->willReturn('the_entity_type_id');
+    $display->getTargetBundle()->willReturn('the_entity_type_bundle');
+    $display->getLayout()->willReturn($this->layoutPlugin);
+    $display->getLayoutId()->willReturn('two_column');
+    $display->getLayoutSettings()->willReturn([]);
+    $display->getComponents()->willReturn([
+      'test1' => [
+        'region' => 'right',
+      ],
+      'test2' => [
+        'region' => 'left',
+      ],
+      'test3' => [
+        'region' => 'unknown_region',
+      ],
+      'field_layout' => [
+        'region' => 'right',
+      ],
+      'non_configurable_field' => [
+        'region' => 'left',
+      ],
+    ]);
+
+    $expected = [
+      'test1' => [
+        '#markup' => 'Test1',
+        '#group' => 'right',
+      ],
+      'test2' => [
+        '#markup' => 'Test2',
+        '#group' => 'existing_group',
+      ],
+      'test3' => [
+        '#markup' => 'Test3',
+      ],
+      'field_layout' => [
+        '#markup' => 'Field created through the UI happens to be named "Layout"',
+        '#group' => 'right',
+      ],
+      'non_configurable_field' => [
+        '#markup' => 'Non-configurable',
+      ],
+      '_field_layout' => [
+        'left' => [
+          '#process' => ['\Drupal\Core\Render\Element\RenderElementBase::processGroup'],
+          '#pre_render' => ['\Drupal\Core\Render\Element\RenderElementBase::preRenderGroup'],
+        ],
+        'right' => [
+          '#process' => ['\Drupal\Core\Render\Element\RenderElementBase::processGroup'],
+          '#pre_render' => ['\Drupal\Core\Render\Element\RenderElementBase::preRenderGroup'],
+        ],
+        '#in_preview' => FALSE,
+        '#settings' => [
+          'label' => '',
+        ],
+        '#layout' => $this->pluginDefinition,
+        '#theme' => 'layout__twocol',
+        '#attached' => [
+          'library' => [
+            'field_layout/drupal.layout.twocol',
+          ],
+        ],
+      ],
+    ];
+    $this->fieldLayoutBuilder->buildForm($build, $display->reveal());
+    $this->assertEquals($expected, $build);
+    $this->assertSame($expected, $build);
+  }
+
+  /**
+   * @covers ::buildForm
+   */
+  public function testBuildFormEmpty(): void {
+    $definitions = [];
+    $non_configurable_field_definition = $this->prophesize(FieldDefinitionInterface::class);
+    $non_configurable_field_definition->isDisplayConfigurable('form')->willReturn(FALSE);
+    $definitions['non_configurable_field'] = $non_configurable_field_definition->reveal();
+    $this->entityFieldManager->getFieldDefinitions('the_entity_type_id', 'the_entity_type_bundle')->willReturn($definitions);
+    $this->entityFieldManager->getExtraFields('the_entity_type_id', 'the_entity_type_bundle')->willReturn([]);
+
+    $build = [
+      'non_configurable_field' => [
+        '#markup' => 'Non-configurable',
+      ],
+    ];
+
+    $display = $this->prophesize(EntityDisplayWithLayoutInterface::class);
+    $display->getTargetEntityTypeId()->willReturn('the_entity_type_id');
+    $display->getTargetBundle()->willReturn('the_entity_type_bundle');
+    $display->getLayout()->willReturn($this->layoutPlugin);
+    $display->getLayoutId()->willReturn('two_column');
+    $display->getLayoutSettings()->willReturn([]);
+    $display->getComponents()->willReturn([
+      'test1' => [
+        'region' => 'right',
+      ],
+      'non_configurable_field' => [
+        'region' => 'left',
+      ],
+    ]);
+
+    $expected = [
+      'non_configurable_field' => [
+        '#markup' => 'Non-configurable',
+      ],
+    ];
+    $this->fieldLayoutBuilder->buildForm($build, $display->reveal());
+    $this->assertSame($expected, $build);
+  }
+
+  /**
+   * @covers ::buildForm
+   */
+  public function testBuildFormNoLayout(): void {
+    $this->entityFieldManager->getFieldDefinitions(Argument::any(), Argument::any())->shouldNotBeCalled();
+
+    $build = [
+      'test1' => [
+        '#markup' => 'Test1',
+      ],
+    ];
+
+    $display = $this->prophesize(EntityDisplayWithLayoutInterface::class);
+    $display->getLayoutId()->willReturn('unknown');
+    $display->getLayoutSettings()->willReturn([]);
+    $display->getComponents()->shouldNotBeCalled();
+
+    $expected = [
+      'test1' => [
+        '#markup' => 'Test1',
+      ],
+    ];
+    $this->fieldLayoutBuilder->buildForm($build, $display->reveal());
+    $this->assertSame($expected, $build);
+  }
+
+}