class ManageFieldsFunctionalTest

class ManageFieldsFunctionalTest extends BrowserTestBase {
    use FieldUiTestTrait;
    use EntityReferenceTestTrait;
    
    /**
     * Modules to install.
     *
     * @var array
     */
    protected static $modules = [
        'node',
        'field_ui',
        'field_test',
        'taxonomy',
        'image',
        'block',
        'node_access_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * The ID of the custom content type created for testing.
     *
     * @var string
     */
    protected $contentType;
    
    /**
     * The label for a random field to be created for testing.
     *
     * @var string
     */
    protected $fieldLabel;
    
    /**
     * The input name of a random field to be created for testing.
     *
     * @var string
     */
    protected $fieldNameInput;
    
    /**
     * The name of a random field to be created for testing.
     *
     * @var string
     */
    protected $fieldName;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalPlaceBlock('system_breadcrumb_block');
        $this->drupalPlaceBlock('local_actions_block');
        $this->drupalPlaceBlock('local_tasks_block');
        $this->drupalPlaceBlock('page_title_block');
        // Create a test user.
        $admin_user = $this->drupalCreateUser([
            'access content',
            'administer content types',
            'bypass node access',
            'administer node fields',
            'administer node form display',
            'administer node display',
            'administer taxonomy',
            'administer taxonomy_term fields',
            'administer taxonomy_term display',
            'administer users',
            'administer account settings',
            'administer user display',
        ]);
        $this->drupalLogin($admin_user);
        // Create content type, with underscores.
        $type_name = strtolower($this->randomMachineName(8)) . '_test';
        $type = $this->drupalCreateContentType([
            'name' => $type_name,
            'type' => $type_name,
        ]);
        $this->contentType = $type->id();
        // Create random field name with markup to test escaping.
        $this->fieldLabel = '<em>' . $this->randomMachineName(8) . '</em>';
        $this->fieldNameInput = strtolower($this->randomMachineName(8));
        $this->fieldName = 'field_' . $this->fieldNameInput;
        // Create Basic page and Article node types.
        $this->drupalCreateContentType([
            'type' => 'page',
            'name' => 'Basic page',
        ]);
        $this->drupalCreateContentType([
            'type' => 'article',
            'name' => 'Article',
        ]);
        // Create a vocabulary named "Tags".
        $vocabulary = Vocabulary::create([
            'name' => 'Tags',
            'vid' => 'tags',
            'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
        ]);
        $vocabulary->save();
        $handler_settings = [
            'target_bundles' => [
                $vocabulary->id() => $vocabulary->id(),
            ],
        ];
        $this->createEntityReferenceField('node', 'article', 'field_' . $vocabulary->id(), 'Tags', 'taxonomy_term', 'default', $handler_settings);
        \Drupal::service('entity_display.repository')->getFormDisplay('node', 'article')
            ->setComponent('field_' . $vocabulary->id())
            ->save();
        // Setup node access testing.
        node_access_rebuild();
        node_access_test_add_field(NodeType::load('article'));
        \Drupal::state()->set('node_access_test.private', TRUE);
    }
    
    /**
     * Runs the field CRUD tests.
     *
     * In order to act on the same fields, and not create the fields over and over
     * again the following tests create, update and delete the same fields.
     */
    public function testCRUDFields() {
        $this->manageFieldsPage();
        $this->createField();
        $this->updateField();
        $this->addExistingField();
        $this->cardinalitySettings();
        $this->fieldListAdminPage();
        $this->deleteField();
        $this->addPersistentFieldStorage();
    }
    
    /**
     * Tests the manage fields page.
     *
     * @param string $type
     *   (optional) The name of a content type.
     */
    public function manageFieldsPage($type = '') {
        $type = empty($type) ? $this->contentType : $type;
        $this->drupalGet('admin/structure/types/manage/' . $type . '/fields');
        // Check all table columns.
        $table_headers = [
            'Label',
            'Machine name',
            'Field type',
            'Operations',
        ];
        foreach ($table_headers as $table_header) {
            // We check that the label appear in the table headings.
            $this->assertSession()
                ->responseContains($table_header . '</th>');
        }
        // Test the "Add field" action link.
        $this->assertSession()
            ->linkExists('Add field');
        // Assert entity operations for all fields.
        $number_of_links = 3;
        $number_of_links_found = 0;
        $operation_links = $this->xpath('//ul[@class = "dropbutton"]/li/a');
        $url = base_path() . "admin/structure/types/manage/{$type}/fields/node.{$type}.body";
        foreach ($operation_links as $link) {
            switch ($link->getAttribute('title')) {
                case 'Edit field settings.':
                    $this->assertSame($url, $link->getAttribute('href'));
                    $number_of_links_found++;
                    break;
                case 'Edit storage settings.':
                    $this->assertSame("{$url}/storage", $link->getAttribute('href'));
                    $number_of_links_found++;
                    break;
                case 'Delete field.':
                    $this->assertSame("{$url}/delete", $link->getAttribute('href'));
                    $number_of_links_found++;
                    break;
            }
        }
        $this->assertEquals($number_of_links, $number_of_links_found);
    }
    
    /**
     * Tests adding a new field.
     *
     * @todo Assert properties can be set in the form and read back in
     * $field_storage and $fields.
     */
    public function createField() {
        // Create a test field.
        $this->fieldUIAddNewField('admin/structure/types/manage/' . $this->contentType, $this->fieldNameInput, $this->fieldLabel);
    }
    
    /**
     * Tests editing an existing field.
     */
    public function updateField() {
        $field_id = 'node.' . $this->contentType . '.' . $this->fieldName;
        // Go to the field edit page.
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/' . $field_id . '/storage');
        $this->assertSession()
            ->assertEscaped($this->fieldLabel);
        // Populate the field settings with new settings.
        $string = 'updated dummy test string';
        $edit = [
            'settings[test_field_storage_setting]' => $string,
        ];
        $this->submitForm($edit, 'Save field settings');
        // Go to the field edit page.
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/' . $field_id);
        $edit = [
            'settings[test_field_setting]' => $string,
        ];
        $this->assertSession()
            ->pageTextContains('Default value');
        $this->submitForm($edit, 'Save settings');
        // Assert the field settings are correct.
        $this->assertFieldSettings($this->contentType, $this->fieldName, $string);
        // Assert redirection back to the "manage fields" page.
        $this->assertSession()
            ->addressEquals('admin/structure/types/manage/' . $this->contentType . '/fields');
    }
    
    /**
     * Tests adding an existing field in another content type.
     */
    public function addExistingField() {
        // Check "Re-use existing field" appears.
        $this->drupalGet('admin/structure/types/manage/page/fields/add-field');
        $this->assertSession()
            ->pageTextContains('Re-use an existing field');
        // Check that fields of other entity types (here, the 'comment_body' field)
        // do not show up in the "Re-use existing field" list.
        $this->assertSession()
            ->optionNotExists('edit-existing-storage-name', 'comment');
        // Validate the FALSE assertion above by also testing a valid one.
        $this->assertSession()
            ->optionExists('edit-existing-storage-name', $this->fieldName);
        // Add a new field based on an existing field.
        $this->fieldUIAddExistingField("admin/structure/types/manage/page", $this->fieldName, $this->fieldLabel . '_2');
    }
    
    /**
     * Tests the cardinality settings of a field.
     *
     * We do not test if the number can be submitted with anything else than a
     * numeric value. That is tested already in FormTest::testNumber().
     */
    public function cardinalitySettings() {
        $field_edit_path = 'admin/structure/types/manage/article/fields/node.article.body/storage';
        // Assert the cardinality other field cannot be empty when cardinality is
        // set to 'number'.
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => '',
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains('Number of values is required.');
        // Submit a custom number.
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 6,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains('Updated field Body field settings.');
        $this->drupalGet($field_edit_path);
        $this->assertSession()
            ->fieldValueEquals('cardinality', 'number');
        $this->assertSession()
            ->fieldValueEquals('cardinality_number', 6);
        // Check that tabs displayed.
        $this->assertSession()
            ->linkExists('Edit');
        $this->assertSession()
            ->linkByHrefExists('admin/structure/types/manage/article/fields/node.article.body');
        $this->assertSession()
            ->linkExists('Field settings');
        $this->assertSession()
            ->linkByHrefExists($field_edit_path);
        // Add two entries in the body.
        $edit = [
            'title[0][value]' => 'Cardinality',
            'body[0][value]' => 'Body 1',
            'body[1][value]' => 'Body 2',
        ];
        $this->drupalGet('node/add/article');
        $this->submitForm($edit, 'Save');
        // Assert that you can't set the cardinality to a lower number than the
        // highest delta of this field.
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 1,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains("There is 1 entity with 2 or more values in this field.");
        // Create a second entity with three values.
        $edit = [
            'title[0][value]' => 'Cardinality 3',
            'body[0][value]' => 'Body 1',
            'body[1][value]' => 'Body 2',
            'body[2][value]' => 'Body 3',
        ];
        $this->drupalGet('node/add/article');
        $this->submitForm($edit, 'Save');
        // Set to unlimited.
        $edit = [
            'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains('Updated field Body field settings.');
        $this->drupalGet($field_edit_path);
        $this->assertSession()
            ->fieldValueEquals('cardinality', FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
        $this->assertSession()
            ->fieldValueEquals('cardinality_number', 1);
        // Assert that you can't set the cardinality to a lower number then the
        // highest delta of this field but can set it to the same.
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 1,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains("There are 2 entities with 2 or more values in this field.");
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 2,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains("There is 1 entity with 3 or more values in this field.");
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 3,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        // Test the cardinality validation is not access sensitive.
        // Remove the cardinality limit 4 so we can add a node the user doesn't have access to.
        $edit = [
            'cardinality' => (string) FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $node = $this->drupalCreateNode([
            'private' => TRUE,
            'uid' => 0,
            'type' => 'article',
        ]);
        $node->body
            ->appendItem('body 1');
        $node->body
            ->appendItem('body 2');
        $node->body
            ->appendItem('body 3');
        $node->body
            ->appendItem('body 4');
        $node->save();
        // Assert that you can't set the cardinality to a lower number then the
        // highest delta of this field (including inaccessible entities) but can
        // set it to the same.
        $this->drupalGet($field_edit_path);
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 2,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains("There are 2 entities with 3 or more values in this field.");
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 3,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
        $this->assertSession()
            ->pageTextContains("There is 1 entity with 4 or more values in this field.");
        $edit = [
            'cardinality' => 'number',
            'cardinality_number' => 4,
        ];
        $this->drupalGet($field_edit_path);
        $this->submitForm($edit, 'Save field settings');
    }
    
    /**
     * Tests deleting a field from the field edit form.
     */
    protected function deleteField() {
        // Delete the field.
        $field_id = 'node.' . $this->contentType . '.' . $this->fieldName;
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/' . $field_id);
        $this->clickLink('Delete');
        $this->assertSession()
            ->statusCodeEquals(200);
    }
    
    /**
     * Tests that persistent field storage appears in the field UI.
     */
    protected function addPersistentFieldStorage() {
        $field_storage = FieldStorageConfig::loadByName('node', $this->fieldName);
        // Persist the field storage even if there are no fields.
        $field_storage->set('persist_with_no_fields', TRUE)
            ->save();
        // Delete all instances of the field.
        foreach ($field_storage->getBundles() as $node_type) {
            // Delete all the body field instances.
            $this->drupalGet('admin/structure/types/manage/' . $node_type . '/fields/node.' . $node_type . '.' . $this->fieldName);
            $this->clickLink('Delete');
            $this->submitForm([], 'Delete');
        }
        // Check "Re-use existing field" appears.
        $this->drupalGet('admin/structure/types/manage/page/fields/add-field');
        $this->assertSession()
            ->pageTextContains("Re-use an existing field");
        // Ensure that we test with a label that contains HTML.
        $label = $this->randomString(4) . '<br/>' . $this->randomString(4);
        // Add a new field for the orphaned storage.
        $this->fieldUIAddExistingField("admin/structure/types/manage/page", $this->fieldName, $label);
    }
    
    /**
     * Asserts field settings are as expected.
     *
     * @param string $bundle
     *   The bundle name for the field.
     * @param string $field_name
     *   The field name for the field.
     * @param string $string
     *   The settings text.
     * @param string $entity_type
     *   The entity type for the field.
     *
     * @internal
     */
    public function assertFieldSettings(string $bundle, string $field_name, string $string = 'dummy test string', string $entity_type = 'node') : void {
        // Assert field storage settings.
        $field_storage = FieldStorageConfig::loadByName($entity_type, $field_name);
        $this->assertSame($string, $field_storage->getSetting('test_field_storage_setting'), 'Field storage settings were found.');
        // Assert field settings.
        $field = FieldConfig::loadByName($entity_type, $bundle, $field_name);
        $this->assertSame($string, $field->getSetting('test_field_setting'), 'Field settings were found.');
    }
    
    /**
     * Tests that the 'field_prefix' setting works on Field UI.
     */
    public function testFieldPrefix() {
        // Change default field prefix.
        $field_prefix = strtolower($this->randomMachineName(10));
        $this->config('field_ui.settings')
            ->set('field_prefix', $field_prefix)
            ->save();
        // Create a field input and label exceeding the new maxlength, which is 22.
        $field_exceed_max_length_label = $this->randomString(23);
        $field_exceed_max_length_input = $this->randomMachineName(23);
        // Try to create the field.
        $edit = [
            'label' => $field_exceed_max_length_label,
            'field_name' => $field_exceed_max_length_input,
        ];
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/add-field');
        $this->submitForm($edit, 'Save and continue');
        $this->assertSession()
            ->pageTextContains('Machine-readable name cannot be longer than 22 characters but is currently 23 characters long.');
        // Create a valid field.
        $this->fieldUIAddNewField('admin/structure/types/manage/' . $this->contentType, $this->fieldNameInput, $this->fieldLabel);
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/node.' . $this->contentType . '.' . $field_prefix . $this->fieldNameInput);
        $this->assertSession()
            ->pageTextContains($this->fieldLabel . ' settings for ' . $this->contentType);
    }
    
    /**
     * Tests that default value is correctly validated and saved.
     */
    public function testDefaultValue() {
        // Create a test field storage and field.
        $field_name = 'test';
        FieldStorageConfig::create([
            'field_name' => $field_name,
            'entity_type' => 'node',
            'type' => 'test_field',
        ])->save();
        $field = FieldConfig::create([
            'field_name' => $field_name,
            'entity_type' => 'node',
            'bundle' => $this->contentType,
        ]);
        $field->save();
        
        /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
        $display_repository = \Drupal::service('entity_display.repository');
        $display_repository->getFormDisplay('node', $this->contentType)
            ->setComponent($field_name)
            ->save();
        $admin_path = 'admin/structure/types/manage/' . $this->contentType . '/fields/' . $field->id();
        $element_id = "edit-default-value-input-{$field_name}-0-value";
        $element_name = "default_value_input[{$field_name}][0][value]";
        $this->drupalGet($admin_path);
        $this->assertSession()
            ->fieldValueEquals($element_id, '');
        // Check that invalid default values are rejected.
        $edit = [
            $element_name => '-1',
        ];
        $this->drupalGet($admin_path);
        $this->submitForm($edit, 'Save settings');
        $this->assertSession()
            ->pageTextContains("{$field_name} does not accept the value -1");
        // Check that the default value is saved.
        $edit = [
            $element_name => '1',
        ];
        $this->drupalGet($admin_path);
        $this->submitForm($edit, 'Save settings');
        $this->assertSession()
            ->pageTextContains("Saved {$field_name} configuration");
        $field = FieldConfig::loadByName('node', $this->contentType, $field_name);
        $this->assertEquals([
            [
                'value' => 1,
            ],
        ], $field->getDefaultValueLiteral(), 'The default value was correctly saved.');
        // Check that the default value shows up in the form
        $this->drupalGet($admin_path);
        $this->assertSession()
            ->fieldValueEquals($element_id, '1');
        // Check that the default value can be emptied.
        $edit = [
            $element_name => '',
        ];
        $this->submitForm($edit, 'Save settings');
        $this->assertSession()
            ->pageTextContains("Saved {$field_name} configuration");
        $field = FieldConfig::loadByName('node', $this->contentType, $field_name);
        $this->assertEquals([], $field->getDefaultValueLiteral(), 'The default value was correctly saved.');
        // Check that the default value can be empty when the field is marked as
        // required and can store unlimited values.
        $field_storage = FieldStorageConfig::loadByName('node', $field_name);
        $field_storage->setCardinality(FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
        $field_storage->save();
        $this->drupalGet($admin_path);
        $edit = [
            'required' => 1,
        ];
        $this->submitForm($edit, 'Save settings');
        $this->drupalGet($admin_path);
        $this->submitForm([], 'Save settings');
        $this->assertSession()
            ->pageTextContains("Saved {$field_name} configuration");
        $field = FieldConfig::loadByName('node', $this->contentType, $field_name);
        $this->assertEquals([], $field->getDefaultValueLiteral(), 'The default value was correctly saved.');
        // Check that the default widget is used when the field is hidden.
        $display_repository->getFormDisplay($field->getTargetEntityTypeId(), $field->getTargetBundle())
            ->removeComponent($field_name)
            ->save();
        $this->drupalGet($admin_path);
        $this->assertSession()
            ->fieldValueEquals($element_id, '');
    }
    
    /**
     * Tests that deletion removes field storages and fields as expected.
     */
    public function testDeleteField() {
        // Create a new field.
        $bundle_path1 = 'admin/structure/types/manage/' . $this->contentType;
        $this->fieldUIAddNewField($bundle_path1, $this->fieldNameInput, $this->fieldLabel);
        // Create an additional node type.
        $type_name2 = strtolower($this->randomMachineName(8)) . '_test';
        $type2 = $this->drupalCreateContentType([
            'name' => $type_name2,
            'type' => $type_name2,
        ]);
        $type_name2 = $type2->id();
        // Add a field to the second node type.
        $bundle_path2 = 'admin/structure/types/manage/' . $type_name2;
        $this->fieldUIAddExistingField($bundle_path2, $this->fieldName, $this->fieldLabel);
        // Delete the first field.
        $this->fieldUIDeleteField($bundle_path1, "node.{$this->contentType}.{$this->fieldName}", $this->fieldLabel, $this->contentType);
        // Check that the field was deleted.
        $this->assertNull(FieldConfig::loadByName('node', $this->contentType, $this->fieldName), 'Field was deleted.');
        // Check that the field storage was not deleted
        $this->assertNotNull(FieldStorageConfig::loadByName('node', $this->fieldName), 'Field storage was not deleted.');
        // Delete the second field.
        $this->fieldUIDeleteField($bundle_path2, "node.{$type_name2}.{$this->fieldName}", $this->fieldLabel, $type_name2);
        // Check that the field was deleted.
        $this->assertNull(FieldConfig::loadByName('node', $type_name2, $this->fieldName), 'Field was deleted.');
        // Check that the field storage was deleted too.
        $this->assertNull(FieldStorageConfig::loadByName('node', $this->fieldName), 'Field storage was deleted.');
    }
    
    /**
     * Tests that Field UI respects disallowed field names.
     */
    public function testDisallowedFieldNames() {
        // Reset the field prefix so we can test properly.
        $this->config('field_ui.settings')
            ->set('field_prefix', '')
            ->save();
        $label = 'Disallowed field';
        $edit = [
            'label' => $label,
            'new_storage_type' => 'test_field',
        ];
        // Try with an entity key.
        $edit['field_name'] = 'title';
        $bundle_path = 'admin/structure/types/manage/' . $this->contentType;
        $this->drupalGet("{$bundle_path}/fields/add-field");
        $this->submitForm($edit, 'Save and continue');
        $this->assertSession()
            ->pageTextContains('The machine-readable name is already in use. It must be unique.');
        // Try with a base field.
        $edit['field_name'] = 'sticky';
        $bundle_path = 'admin/structure/types/manage/' . $this->contentType;
        $this->drupalGet("{$bundle_path}/fields/add-field");
        $this->submitForm($edit, 'Save and continue');
        $this->assertSession()
            ->pageTextContains('The machine-readable name is already in use. It must be unique.');
    }
    
    /**
     * Tests that Field UI respects locked fields.
     */
    public function testLockedField() {
        // Create a locked field and attach it to a bundle. We need to do this
        // programmatically as there's no way to create a locked field through UI.
        $field_name = strtolower($this->randomMachineName(8));
        $field_storage = FieldStorageConfig::create([
            'field_name' => $field_name,
            'entity_type' => 'node',
            'type' => 'test_field',
            'cardinality' => 1,
            'locked' => TRUE,
        ]);
        $field_storage->save();
        FieldConfig::create([
            'field_storage' => $field_storage,
            'bundle' => $this->contentType,
        ])
            ->save();
        \Drupal::service('entity_display.repository')->getFormDisplay('node', $this->contentType)
            ->setComponent($field_name, [
            'type' => 'test_field_widget',
        ])
            ->save();
        // Check that the links for edit and delete are not present.
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields');
        $locked = $this->xpath('//tr[@id=:field_name]/td[4]', [
            ':field_name' => $field_name,
        ]);
        $this->assertSame('Locked', $locked[0]->getHtml(), 'Field is marked as Locked in the UI');
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/node.' . $this->contentType . '.' . $field_name . '/delete');
        $this->assertSession()
            ->statusCodeEquals(403);
    }
    
    /**
     * Tests that Field UI respects the 'no_ui' flag in the field type definition.
     */
    public function testHiddenFields() {
        // Check that the field type is not available in the 'add new field' row.
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/add-field');
        $this->assertSession()
            ->optionNotExists('edit-new-storage-type', 'hidden_test_field');
        $this->assertSession()
            ->optionExists('edit-new-storage-type', 'shape');
        // Create a field storage and a field programmatically.
        $field_name = 'hidden_test_field';
        FieldStorageConfig::create([
            'field_name' => $field_name,
            'entity_type' => 'node',
            'type' => $field_name,
        ])->save();
        $field = [
            'field_name' => $field_name,
            'bundle' => $this->contentType,
            'entity_type' => 'node',
            'label' => 'Hidden field',
        ];
        FieldConfig::create($field)->save();
        \Drupal::service('entity_display.repository')->getFormDisplay('node', $this->contentType)
            ->setComponent($field_name)
            ->save();
        $this->assertInstanceOf(FieldConfig::class, FieldConfig::load('node.' . $this->contentType . '.' . $field_name));
        // Check that the newly added field appears on the 'Manage Fields'
        // screen.
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields');
        $this->assertSession()
            ->elementTextContains('xpath', '//table[@id="field-overview"]//tr[@id="hidden-test-field"]//td[1]', $field['label']);
        // Check that the field does not appear in the 're-use existing field' row
        // on other bundles.
        $this->drupalGet('admin/structure/types/manage/page/fields/add-field');
        $this->assertSession()
            ->optionNotExists('edit-existing-storage-name', $field_name);
        $this->assertSession()
            ->optionExists('edit-existing-storage-name', 'field_tags');
        // Check that non-configurable fields are not available.
        $field_types = \Drupal::service('plugin.manager.field.field_type')->getDefinitions();
        foreach ($field_types as $field_type => $definition) {
            if (empty($definition['no_ui'])) {
                $this->assertSession()
                    ->optionExists('edit-new-storage-type', $field_type);
            }
            else {
                $this->assertSession()
                    ->optionNotExists('edit-new-storage-type', $field_type);
            }
        }
    }
    
    /**
     * Tests that a duplicate field name is caught by validation.
     */
    public function testDuplicateFieldName() {
        // field_tags already exists, so we're expecting an error when trying to
        // create a new field with the same name.
        $edit = [
            'field_name' => 'tags',
            'label' => $this->randomMachineName(),
            'new_storage_type' => 'entity_reference',
        ];
        $url = 'admin/structure/types/manage/' . $this->contentType . '/fields/add-field';
        $this->drupalGet($url);
        $this->submitForm($edit, 'Save and continue');
        $this->assertSession()
            ->pageTextContains('The machine-readable name is already in use. It must be unique.');
        $this->assertSession()
            ->addressEquals($url);
    }
    
    /**
     * Tests that external URLs in the 'destinations' query parameter are blocked.
     */
    public function testExternalDestinations() {
        $options = [
            'query' => [
                'destinations' => [
                    'http://example.com',
                ],
            ],
        ];
        $this->drupalGet('admin/structure/types/manage/article/fields/node.article.body/storage', $options);
        $this->submitForm([], 'Save field settings');
        // The external redirect should not fire.
        $this->assertSession()
            ->addressEquals('admin/structure/types/manage/article/fields/node.article.body/storage?destinations%5B0%5D=http%3A//example.com');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->responseContains('Attempt to update field <em class="placeholder">Body</em> failed: <em class="placeholder">The internal path component &#039;http://example.com&#039; is external. You are not allowed to specify an external URL together with internal:/.</em>.');
    }
    
    /**
     * Tests that deletion removes field storages and fields as expected for a term.
     */
    public function testDeleteTaxonomyField() {
        // Create a new field.
        $bundle_path = 'admin/structure/taxonomy/manage/tags/overview';
        $this->fieldUIAddNewField($bundle_path, $this->fieldNameInput, $this->fieldLabel);
        // Delete the field.
        $this->fieldUIDeleteField($bundle_path, "taxonomy_term.tags.{$this->fieldName}", $this->fieldLabel, 'Tags');
        // Check that the field was deleted.
        $this->assertNull(FieldConfig::loadByName('taxonomy_term', 'tags', $this->fieldName), 'Field was deleted.');
        // Check that the field storage was deleted too.
        $this->assertNull(FieldStorageConfig::loadByName('taxonomy_term', $this->fieldName), 'Field storage was deleted.');
    }
    
    /**
     * Tests that help descriptions render valid HTML.
     */
    public function testHelpDescriptions() {
        // Create an image field
        FieldStorageConfig::create([
            'field_name' => 'field_image',
            'entity_type' => 'node',
            'type' => 'image',
        ])->save();
        FieldConfig::create([
            'field_name' => 'field_image',
            'entity_type' => 'node',
            'label' => 'Image',
            'bundle' => 'article',
        ])->save();
        \Drupal::service('entity_display.repository')->getFormDisplay('node', 'article')
            ->setComponent('field_image')
            ->save();
        $edit = [
            'description' => '<strong>Test with an upload field.',
        ];
        $this->drupalGet('admin/structure/types/manage/article/fields/node.article.field_image');
        $this->submitForm($edit, 'Save settings');
        // Check that hook_field_widget_single_element_form_alter() does believe
        // this is the default value form.
        $this->drupalGet('admin/structure/types/manage/article/fields/node.article.field_tags');
        $this->assertSession()
            ->pageTextContains('From hook_field_widget_single_element_form_alter(): Default form is true.');
        $edit = [
            'description' => '<em>Test with a non upload field.',
        ];
        $this->drupalGet('admin/structure/types/manage/article/fields/node.article.field_tags');
        $this->submitForm($edit, 'Save settings');
        $this->drupalGet('node/add/article');
        $this->assertSession()
            ->responseContains('<strong>Test with an upload field.</strong>');
        $this->assertSession()
            ->responseContains('<em>Test with a non upload field.</em>');
    }
    
    /**
     * Tests that the field list administration page operates correctly.
     */
    public function fieldListAdminPage() {
        $this->drupalGet('admin/reports/fields');
        $this->assertSession()
            ->pageTextContains($this->fieldName);
        $this->assertSession()
            ->linkByHrefExists('admin/structure/types/manage/' . $this->contentType . '/fields');
    }
    
    /**
     * Tests the "preconfigured field" functionality.
     *
     * @see \Drupal\Core\Field\PreconfiguredFieldUiOptionsInterface
     */
    public function testPreconfiguredFields() {
        $this->drupalGet('admin/structure/types/manage/article/fields/add-field');
        // Check that the preconfigured field option exist alongside the regular
        // field type option.
        $this->assertSession()
            ->optionExists('edit-new-storage-type', 'field_ui:test_field_with_preconfigured_options:custom_options');
        $this->assertSession()
            ->optionExists('edit-new-storage-type', 'test_field_with_preconfigured_options');
        // Add a field with every possible preconfigured value.
        $this->fieldUIAddNewField(NULL, 'test_custom_options', 'Test label', 'field_ui:test_field_with_preconfigured_options:custom_options');
        $field_storage = FieldStorageConfig::loadByName('node', 'field_test_custom_options');
        $this->assertEquals(FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED, $field_storage->getCardinality());
        $this->assertEquals('preconfigured_storage_setting', $field_storage->getSetting('test_field_storage_setting'));
        $field = FieldConfig::loadByName('node', 'article', 'field_test_custom_options');
        $this->assertTrue($field->isRequired());
        $this->assertEquals('preconfigured_field_setting', $field->getSetting('test_field_setting'));
        
        /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
        $display_repository = \Drupal::service('entity_display.repository');
        $form_display = $display_repository->getFormDisplay('node', 'article');
        $this->assertEquals('test_field_widget_multiple', $form_display->getComponent('field_test_custom_options')['type']);
        $view_display = $display_repository->getViewDisplay('node', 'article');
        $this->assertEquals('field_test_multiple', $view_display->getComponent('field_test_custom_options')['type']);
        $this->assertEquals('altered dummy test string', $view_display->getComponent('field_test_custom_options')['settings']['test_formatter_setting_multiple']);
    }
    
    /**
     * Tests the access to non-existent field URLs.
     */
    public function testNonExistentFieldUrls() {
        $field_id = 'node.foo.bar';
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/' . $field_id);
        $this->assertSession()
            ->statusCodeEquals(404);
        $this->drupalGet('admin/structure/types/manage/' . $this->contentType . '/fields/' . $field_id . '/storage');
        $this->assertSession()
            ->statusCodeEquals(404);
    }

}