LinkFieldTest.php in Drupal 9

Namespace

Drupal\Tests\link\Functional

File

core/modules/link/tests/src/Functional/LinkFieldTest.php

<?php

namespace Drupal\Tests\link\Functional;

use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\Unicode;
use Drupal\Core\Entity\Entity\EntityViewDisplay;
use Drupal\Core\Link;
use Drupal\Core\Url;
use Drupal\entity_test\Entity\EntityTest;
use Drupal\field\Entity\FieldConfig;
use Drupal\link\LinkItemInterface;
use Drupal\node\NodeInterface;
use Drupal\Tests\BrowserTestBase;
use Drupal\field\Entity\FieldStorageConfig;
use Drupal\Tests\Traits\Core\PathAliasTestTrait;

/**
 * Tests link field widgets and formatters.
 *
 * @group link
 */
class LinkFieldTest extends BrowserTestBase {
  use PathAliasTestTrait;

  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'entity_test',
    'link',
    'node',
    'link_test_base_field',
  ];

  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'classy';

  /**
   * A field to use in this test class.
   *
   * @var \Drupal\field\Entity\FieldStorageConfig
   */
  protected $fieldStorage;

  /**
   * The instance used in this test class.
   *
   * @var \Drupal\field\Entity\FieldConfig
   */
  protected $field;
  protected function setUp() : void {
    parent::setUp();
    $this
      ->drupalLogin($this
      ->drupalCreateUser([
      'view test entity',
      'administer entity_test content',
      'link to any page',
    ]));
  }

  /**
   * Tests link field URL validation.
   */
  public function testURLValidation() {
    $field_name = mb_strtolower($this
      ->randomMachineName());

    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
    ]);
    $this->fieldStorage
      ->save();
    $this->field = FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_DISABLED,
        'link_type' => LinkItemInterface::LINK_GENERIC,
      ],
    ]);
    $this->field
      ->save();

    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
    $display_repository = \Drupal::service('entity_display.repository');
    $display_repository
      ->getFormDisplay('entity_test', 'entity_test')
      ->setComponent($field_name, [
      'type' => 'link_default',
      'settings' => [
        'placeholder_url' => 'http://example.com',
      ],
    ])
      ->save();
    $display_repository
      ->getViewDisplay('entity_test', 'entity_test', 'full')
      ->setComponent($field_name, [
      'type' => 'link',
    ])
      ->save();

    // Display creation form.
    $this
      ->drupalGet('entity_test/add');
    $this
      ->assertSession()
      ->fieldValueEquals("{$field_name}[0][uri]", '');
    $this
      ->assertSession()
      ->responseContains('placeholder="http://example.com"');

    // Create a path alias.
    $this
      ->createPathAlias('/admin', '/a/path/alias');

    // Create a node to test the link widget.
    $node = $this
      ->drupalCreateNode();
    $restricted_node = $this
      ->drupalCreateNode([
      'status' => NodeInterface::NOT_PUBLISHED,
    ]);

    // Define some valid URLs (keys are the entered values, values are the
    // strings displayed to the user).
    $valid_external_entries = [
      'http://www.example.com/' => 'http://www.example.com/',
      // Strings within parenthesis without leading space char.
      'http://www.example.com/strings_(string_within_parenthesis)' => 'http://www.example.com/strings_(string_within_parenthesis)',
      // Numbers within parenthesis without leading space char.
      'http://www.example.com/numbers_(9999)' => 'http://www.example.com/numbers_(9999)',
    ];
    $valid_internal_entries = [
      '/entity_test/add' => '/entity_test/add',
      '/a/path/alias' => '/a/path/alias',
      // Front page, with query string and fragment.
      '/' => '&lt;front&gt;',
      '/?example=llama' => '&lt;front&gt;?example=llama',
      '/#example' => '&lt;front&gt;#example',
      // Trailing spaces should be ignored.
      '/ ' => '&lt;front&gt;',
      '/path with spaces ' => '/path with spaces',
      // @todo '<front>' is valid input for BC reasons, may be removed by
      //   https://www.drupal.org/node/2421941
      '<front>' => '&lt;front&gt;',
      '<front>#example' => '&lt;front&gt;#example',
      '<front>?example=llama' => '&lt;front&gt;?example=llama',
      // Text-only links.
      '<nolink>' => '&lt;nolink&gt;',
      'route:<nolink>' => '&lt;nolink&gt;',
      '<none>' => '&lt;none&gt;',
      // Query string and fragment.
      '?example=llama' => '?example=llama',
      '#example' => '#example',
      // Entity reference autocomplete value.
      $node
        ->label() . ' (1)' => $node
        ->label() . ' (1)',
      // Entity URI displayed as ER autocomplete value when displayed in a form.
      'entity:node/1' => $node
        ->label() . ' (1)',
      // URI for an entity that exists, but is not accessible by the user.
      'entity:node/' . $restricted_node
        ->id() => '- Restricted access - (' . $restricted_node
        ->id() . ')',
      // URI for an entity that doesn't exist, but with a valid ID.
      'entity:user/999999' => 'entity:user/999999',
    ];

    // Define some invalid URLs.
    $validation_error_1 = "The path '@link_path' is invalid.";
    $validation_error_2 = 'Manually entered paths should start with one of the following characters: / ? #';
    $validation_error_3 = "The path '@link_path' is inaccessible.";
    $invalid_external_entries = [
      // Invalid protocol
      'invalid://not-a-valid-protocol' => $validation_error_1,
      // Missing host name
      'http://' => $validation_error_1,
    ];
    $invalid_internal_entries = [
      'no-leading-slash' => $validation_error_2,
      'entity:non_existing_entity_type/yar' => $validation_error_1,
      // URI for an entity that doesn't exist, with an invalid ID.
      'entity:user/invalid-parameter' => $validation_error_1,
    ];

    // Test external and internal URLs for 'link_type' = LinkItemInterface::LINK_GENERIC.
    $this
      ->assertValidEntries($field_name, $valid_external_entries + $valid_internal_entries);
    $this
      ->assertInvalidEntries($field_name, $invalid_external_entries + $invalid_internal_entries);

    // Test external URLs for 'link_type' = LinkItemInterface::LINK_EXTERNAL.
    $this->field
      ->setSetting('link_type', LinkItemInterface::LINK_EXTERNAL);
    $this->field
      ->save();
    $this
      ->assertValidEntries($field_name, $valid_external_entries);
    $this
      ->assertInvalidEntries($field_name, $valid_internal_entries + $invalid_external_entries);

    // Test external URLs for 'link_type' = LinkItemInterface::LINK_INTERNAL.
    $this->field
      ->setSetting('link_type', LinkItemInterface::LINK_INTERNAL);
    $this->field
      ->save();
    $this
      ->assertValidEntries($field_name, $valid_internal_entries);
    $this
      ->assertInvalidEntries($field_name, $valid_external_entries + $invalid_internal_entries);

    // Ensure that users with 'link to any page', don't apply access checking.
    $this
      ->drupalLogin($this
      ->drupalCreateUser([
      'view test entity',
      'administer entity_test content',
    ]));
    $this
      ->assertValidEntries($field_name, [
      '/entity_test/add' => '/entity_test/add',
    ]);
    $this
      ->assertInValidEntries($field_name, [
      '/admin' => $validation_error_3,
    ]);
  }

  /**
   * Asserts that valid URLs can be submitted.
   *
   * @param string $field_name
   *   The field name.
   * @param array $valid_entries
   *   An array of valid URL entries.
   */
  protected function assertValidEntries($field_name, array $valid_entries) {
    foreach ($valid_entries as $uri => $string) {
      $edit = [
        "{$field_name}[0][uri]" => $uri,
      ];
      $this
        ->drupalGet('entity_test/add');
      $this
        ->submitForm($edit, 'Save');
      preg_match('|entity_test/manage/(\\d+)|', $this
        ->getUrl(), $match);
      $id = $match[1];
      $this
        ->assertSession()
        ->pageTextContains('entity_test ' . $id . ' has been created.');
      $this
        ->assertSession()
        ->responseContains('"' . $string . '"');
    }
  }

  /**
   * Asserts that invalid URLs cannot be submitted.
   *
   * @param string $field_name
   *   The field name.
   * @param array $invalid_entries
   *   An array of invalid URL entries.
   */
  protected function assertInvalidEntries($field_name, array $invalid_entries) {
    foreach ($invalid_entries as $invalid_value => $error_message) {
      $edit = [
        "{$field_name}[0][uri]" => $invalid_value,
      ];
      $this
        ->drupalGet('entity_test/add');
      $this
        ->submitForm($edit, 'Save');
      $this
        ->assertSession()
        ->responseContains(strtr($error_message, [
        '@link_path' => $invalid_value,
      ]));
    }
  }

  /**
   * Tests the link title settings of a link field.
   */
  public function testLinkTitle() {
    $field_name = mb_strtolower($this
      ->randomMachineName());

    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
    ]);
    $this->fieldStorage
      ->save();
    $this->field = FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'bundle' => 'entity_test',
      'label' => 'Read more about this entity',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
        'link_type' => LinkItemInterface::LINK_GENERIC,
      ],
    ]);
    $this->field
      ->save();

    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
    $display_repository = \Drupal::service('entity_display.repository');
    $display_repository
      ->getFormDisplay('entity_test', 'entity_test')
      ->setComponent($field_name, [
      'type' => 'link_default',
      'settings' => [
        'placeholder_url' => 'http://example.com',
        'placeholder_title' => 'Enter the text for this link',
      ],
    ])
      ->save();
    $display_repository
      ->getViewDisplay('entity_test', 'entity_test', 'full')
      ->setComponent($field_name, [
      'type' => 'link',
      'label' => 'hidden',
    ])
      ->save();

    // Verify that the link text field works according to the field setting.
    foreach ([
      DRUPAL_DISABLED,
      DRUPAL_REQUIRED,
      DRUPAL_OPTIONAL,
    ] as $title_setting) {

      // Update the link title field setting.
      $this->field
        ->setSetting('title', $title_setting);
      $this->field
        ->save();

      // Display creation form.
      $this
        ->drupalGet('entity_test/add');

      // Assert label is shown.
      $this
        ->assertSession()
        ->pageTextContains('Read more about this entity');
      $this
        ->assertSession()
        ->fieldValueEquals("{$field_name}[0][uri]", '');
      $this
        ->assertSession()
        ->responseContains('placeholder="http://example.com"');
      if ($title_setting === DRUPAL_DISABLED) {
        $this
          ->assertSession()
          ->fieldNotExists("{$field_name}[0][title]");
        $this
          ->assertSession()
          ->responseNotContains('placeholder="Enter the text for this link"');
      }
      else {
        $this
          ->assertSession()
          ->responseContains('placeholder="Enter the text for this link"');
        $this
          ->assertSession()
          ->fieldValueEquals("{$field_name}[0][title]", '');
        if ($title_setting === DRUPAL_OPTIONAL) {

          // Verify that the URL is required, if the link text is non-empty.
          $edit = [
            "{$field_name}[0][title]" => 'Example',
          ];
          $this
            ->submitForm($edit, 'Save');
          $this
            ->assertSession()
            ->pageTextContains('The URL field is required when the Link text field is specified.');
        }
        if ($title_setting === DRUPAL_REQUIRED) {

          // Verify that the link text is required, if the URL is non-empty.
          $edit = [
            "{$field_name}[0][uri]" => 'http://www.example.com',
          ];
          $this
            ->submitForm($edit, 'Save');
          $this
            ->assertSession()
            ->pageTextContains('Link text field is required if there is URL input.');

          // Verify that the link text is not required, if the URL is empty.
          $edit = [
            "{$field_name}[0][uri]" => '',
          ];
          $this
            ->submitForm($edit, 'Save');
          $this
            ->assertSession()
            ->pageTextNotContains('Link text field is required.');

          // Verify that a URL and link text meets requirements.
          $this
            ->drupalGet('entity_test/add');
          $edit = [
            "{$field_name}[0][uri]" => 'http://www.example.com',
            "{$field_name}[0][title]" => 'Example',
          ];
          $this
            ->submitForm($edit, 'Save');
          $this
            ->assertSession()
            ->pageTextNotContains('Link text field is required.');
        }
      }
    }

    // Verify that a link without link text is rendered using the URL as text.
    $value = 'http://www.example.com/';
    $edit = [
      "{$field_name}[0][uri]" => $value,
      "{$field_name}[0][title]" => '',
    ];
    $this
      ->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this
      ->getUrl(), $match);
    $id = $match[1];
    $this
      ->assertSession()
      ->pageTextContains('entity_test ' . $id . ' has been created.');
    $output = $this
      ->renderTestEntity($id);
    $expected_link = (string) Link::fromTextAndUrl($value, Url::fromUri($value))
      ->toString();
    $this
      ->assertStringContainsString($expected_link, $output);

    // Verify that a link with text is rendered using the link text.
    $title = $this
      ->randomMachineName();
    $edit = [
      "{$field_name}[0][title]" => $title,
    ];
    $this
      ->drupalGet("entity_test/manage/{$id}/edit");
    $this
      ->submitForm($edit, 'Save');
    $this
      ->assertSession()
      ->pageTextContains('entity_test ' . $id . ' has been updated.');
    $output = $this
      ->renderTestEntity($id);
    $expected_link = (string) Link::fromTextAndUrl($title, Url::fromUri($value))
      ->toString();
    $this
      ->assertStringContainsString($expected_link, $output);
  }

  /**
   * Tests the default 'link' formatter.
   */
  public function testLinkFormatter() {
    $field_name = mb_strtolower($this
      ->randomMachineName());

    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
      'cardinality' => 3,
    ]);
    $this->fieldStorage
      ->save();
    FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'label' => 'Read more about this entity',
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
        'link_type' => LinkItemInterface::LINK_GENERIC,
      ],
    ])
      ->save();

    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
    $display_repository = \Drupal::service('entity_display.repository');
    $display_repository
      ->getFormDisplay('entity_test', 'entity_test')
      ->setComponent($field_name, [
      'type' => 'link_default',
    ])
      ->save();
    $display_options = [
      'type' => 'link',
      'label' => 'hidden',
    ];
    $display_repository
      ->getViewDisplay('entity_test', 'entity_test', 'full')
      ->setComponent($field_name, $display_options)
      ->save();

    // Create an entity with three link field values:
    // - The first field item uses a URL only.
    // - The second field item uses a URL and link text.
    // - The third field item uses a fragment-only URL with text.
    // For consistency in assertion code below, the URL is assigned to the title
    // variable for the first field.
    $this
      ->drupalGet('entity_test/add');
    $url1 = 'http://www.example.com/content/articles/archive?author=John&year=2012#com';
    $url2 = 'http://www.example.org/content/articles/archive?author=John&year=2012#org';
    $url3 = '#net';
    $title1 = $url1;

    // Intentionally contains an ampersand that needs sanitization on output.
    $title2 = 'A very long & strange example title that could break the nice layout of the site';
    $title3 = 'Fragment only';
    $edit = [
      "{$field_name}[0][uri]" => $url1,
      // Note that $title1 is not submitted.
      "{$field_name}[0][title]" => '',
      "{$field_name}[1][uri]" => $url2,
      "{$field_name}[1][title]" => $title2,
      "{$field_name}[2][uri]" => $url3,
      "{$field_name}[2][title]" => $title3,
    ];

    // Assert label is shown.
    $this
      ->assertSession()
      ->pageTextContains('Read more about this entity');
    $this
      ->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this
      ->getUrl(), $match);
    $id = $match[1];
    $this
      ->assertSession()
      ->pageTextContains('entity_test ' . $id . ' has been created.');

    // Verify that the link is output according to the formatter settings.
    // Not using generatePermutations(), since that leads to 32 cases, which
    // would not test actual link field formatter functionality but rather
    // the link generator and options/attributes. Only 'url_plain' has a
    // dependency on 'url_only', so we have a total of ~10 cases.
    $options = [
      'trim_length' => [
        NULL,
        6,
      ],
      'rel' => [
        NULL,
        'nofollow',
      ],
      'target' => [
        NULL,
        '_blank',
      ],
      'url_only' => [
        [
          'url_only' => FALSE,
        ],
        [
          'url_only' => FALSE,
          'url_plain' => TRUE,
        ],
        [
          'url_only' => TRUE,
        ],
        [
          'url_only' => TRUE,
          'url_plain' => TRUE,
        ],
      ],
    ];
    foreach ($options as $setting => $values) {
      foreach ($values as $new_value) {

        // Update the field formatter settings.
        if (!is_array($new_value)) {
          $display_options['settings'] = [
            $setting => $new_value,
          ];
        }
        else {
          $display_options['settings'] = $new_value;
        }
        $display_repository
          ->getViewDisplay('entity_test', 'entity_test', 'full')
          ->setComponent($field_name, $display_options)
          ->save();
        $output = $this
          ->renderTestEntity($id);
        switch ($setting) {
          case 'trim_length':
            $url = $url1;
            $title = isset($new_value) ? Unicode::truncate($title1, $new_value, FALSE, TRUE) : $title1;
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url) . '">' . Html::escape($title) . '</a>', $output);
            $url = $url2;
            $title = isset($new_value) ? Unicode::truncate($title2, $new_value, FALSE, TRUE) : $title2;
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url) . '">' . Html::escape($title) . '</a>', $output);
            $url = $url3;
            $title = isset($new_value) ? Unicode::truncate($title3, $new_value, FALSE, TRUE) : $title3;
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url) . '">' . Html::escape($title) . '</a>', $output);
            break;
          case 'rel':
            $rel = isset($new_value) ? ' rel="' . $new_value . '"' : '';
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url1) . '"' . $rel . '>' . Html::escape($title1) . '</a>', $output);
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url2) . '"' . $rel . '>' . Html::escape($title2) . '</a>', $output);
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url3) . '"' . $rel . '>' . Html::escape($title3) . '</a>', $output);
            break;
          case 'target':
            $target = isset($new_value) ? ' target="' . $new_value . '"' : '';
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url1) . '"' . $target . '>' . Html::escape($title1) . '</a>', $output);
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url2) . '"' . $target . '>' . Html::escape($title2) . '</a>', $output);
            $this
              ->assertStringContainsString('<a href="' . Html::escape($url3) . '"' . $target . '>' . Html::escape($title3) . '</a>', $output);
            break;
          case 'url_only':

            // In this case, $new_value is an array.
            if (!$new_value['url_only']) {
              $this
                ->assertStringContainsString('<a href="' . Html::escape($url1) . '">' . Html::escape($title1) . '</a>', $output);
              $this
                ->assertStringContainsString('<a href="' . Html::escape($url2) . '">' . Html::escape($title2) . '</a>', $output);
              $this
                ->assertStringContainsString('<a href="' . Html::escape($url3) . '">' . Html::escape($title3) . '</a>', $output);
            }
            else {
              if (empty($new_value['url_plain'])) {
                $this
                  ->assertStringContainsString('<a href="' . Html::escape($url1) . '">' . Html::escape($url1) . '</a>', $output);
                $this
                  ->assertStringContainsString('<a href="' . Html::escape($url2) . '">' . Html::escape($url2) . '</a>', $output);
                $this
                  ->assertStringContainsString('<a href="' . Html::escape($url3) . '">' . Html::escape($url3) . '</a>', $output);
              }
              else {
                $this
                  ->assertStringNotContainsString('<a href="' . Html::escape($url1) . '">' . Html::escape($url1) . '</a>', $output);
                $this
                  ->assertStringNotContainsString('<a href="' . Html::escape($url2) . '">' . Html::escape($url2) . '</a>', $output);
                $this
                  ->assertStringNotContainsString('<a href="' . Html::escape($url3) . '">' . Html::escape($url3) . '</a>', $output);
                $this
                  ->assertStringContainsString(Html::escape($url1), $output);
                $this
                  ->assertStringContainsString(Html::escape($url2), $output);
                $this
                  ->assertStringContainsString(Html::escape($url3), $output);
              }
            }
            break;
        }
      }
    }
  }

  /**
   * Tests the 'link_separate' formatter.
   *
   * This test is mostly the same as testLinkFormatter(), but they cannot be
   * merged, since they involve different configuration and output.
   */
  public function testLinkSeparateFormatter() {
    $field_name = mb_strtolower($this
      ->randomMachineName());

    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
      'cardinality' => 3,
    ]);
    $this->fieldStorage
      ->save();
    FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
        'link_type' => LinkItemInterface::LINK_GENERIC,
      ],
    ])
      ->save();
    $display_options = [
      'type' => 'link_separate',
      'label' => 'hidden',
    ];

    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
    $display_repository = \Drupal::service('entity_display.repository');
    $display_repository
      ->getFormDisplay('entity_test', 'entity_test')
      ->setComponent($field_name, [
      'type' => 'link_default',
    ])
      ->save();
    $display_repository
      ->getViewDisplay('entity_test', 'entity_test', 'full')
      ->setComponent($field_name, $display_options)
      ->save();

    // Create an entity with three link field values:
    // - The first field item uses a URL only.
    // - The second field item uses a URL and link text.
    // - The third field item uses a fragment-only URL with text.
    // For consistency in assertion code below, the URL is assigned to the title
    // variable for the first field.
    $this
      ->drupalGet('entity_test/add');
    $url1 = 'http://www.example.com/content/articles/archive?author=John&year=2012#com';
    $url2 = 'http://www.example.org/content/articles/archive?author=John&year=2012#org';
    $url3 = '#net';

    // Intentionally contains an ampersand that needs sanitization on output.
    $title2 = 'A very long & strange example title that could break the nice layout of the site';
    $title3 = 'Fragment only';
    $edit = [
      "{$field_name}[0][uri]" => $url1,
      "{$field_name}[1][uri]" => $url2,
      "{$field_name}[1][title]" => $title2,
      "{$field_name}[2][uri]" => $url3,
      "{$field_name}[2][title]" => $title3,
    ];
    $this
      ->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this
      ->getUrl(), $match);
    $id = $match[1];
    $this
      ->assertSession()
      ->pageTextContains('entity_test ' . $id . ' has been created.');

    // Verify that the link is output according to the formatter settings.
    $options = [
      'trim_length' => [
        NULL,
        6,
      ],
      'rel' => [
        NULL,
        'nofollow',
      ],
      'target' => [
        NULL,
        '_blank',
      ],
    ];
    foreach ($options as $setting => $values) {
      foreach ($values as $new_value) {

        // Update the field formatter settings.
        $display_options['settings'] = [
          $setting => $new_value,
        ];
        $display_repository
          ->getViewDisplay('entity_test', 'entity_test', 'full')
          ->setComponent($field_name, $display_options)
          ->save();
        $output = $this
          ->renderTestEntity($id);
        switch ($setting) {
          case 'trim_length':
            $url = $url1;
            $url_title = isset($new_value) ? Unicode::truncate($url, $new_value, FALSE, TRUE) : $url;
            $expected = '<div class="link-item">';
            $expected .= '<div class="link-url"><a href="' . Html::escape($url) . '">' . Html::escape($url_title) . '</a></div>';
            $expected .= '</div>';
            $this
              ->assertStringContainsString($expected, $output);
            $url = $url2;
            $url_title = isset($new_value) ? Unicode::truncate($url, $new_value, FALSE, TRUE) : $url;
            $title = isset($new_value) ? Unicode::truncate($title2, $new_value, FALSE, TRUE) : $title2;
            $expected = '<div class="link-item">';
            $expected .= '<div class="link-title">' . Html::escape($title) . '</div>';
            $expected .= '<div class="link-url"><a href="' . Html::escape($url) . '">' . Html::escape($url_title) . '</a></div>';
            $expected .= '</div>';
            $this
              ->assertStringContainsString($expected, $output);
            $url = $url3;
            $url_title = isset($new_value) ? Unicode::truncate($url, $new_value, FALSE, TRUE) : $url;
            $title = isset($new_value) ? Unicode::truncate($title3, $new_value, FALSE, TRUE) : $title3;
            $expected = '<div class="link-item">';
            $expected .= '<div class="link-title">' . Html::escape($title) . '</div>';
            $expected .= '<div class="link-url"><a href="' . Html::escape($url) . '">' . Html::escape($url_title) . '</a></div>';
            $expected .= '</div>';
            $this
              ->assertStringContainsString($expected, $output);
            break;
          case 'rel':
            $rel = isset($new_value) ? ' rel="' . $new_value . '"' : '';
            $this
              ->assertStringContainsString('<div class="link-url"><a href="' . Html::escape($url1) . '"' . $rel . '>' . Html::escape($url1) . '</a></div>', $output);
            $this
              ->assertStringContainsString('<div class="link-url"><a href="' . Html::escape($url2) . '"' . $rel . '>' . Html::escape($url2) . '</a></div>', $output);
            $this
              ->assertStringContainsString('<div class="link-url"><a href="' . Html::escape($url3) . '"' . $rel . '>' . Html::escape($url3) . '</a></div>', $output);
            break;
          case 'target':
            $target = isset($new_value) ? ' target="' . $new_value . '"' : '';
            $this
              ->assertStringContainsString('<div class="link-url"><a href="' . Html::escape($url1) . '"' . $target . '>' . Html::escape($url1) . '</a></div>', $output);
            $this
              ->assertStringContainsString('<div class="link-url"><a href="' . Html::escape($url2) . '"' . $target . '>' . Html::escape($url2) . '</a></div>', $output);
            $this
              ->assertStringContainsString('<div class="link-url"><a href="' . Html::escape($url3) . '"' . $target . '>' . Html::escape($url3) . '</a></div>', $output);
            break;
        }
      }
    }
  }

  /**
   * Tests '#link_type' property exists on 'link_default' widget.
   *
   * Make sure the 'link_default' widget exposes a '#link_type' property on
   * its element. Modules can use it to understand if a text form element is
   * a link and also which LinkItemInterface::LINK_* is (EXTERNAL, GENERIC,
   * INTERNAL).
   */
  public function testLinkTypeOnLinkWidget() {
    $link_type = LinkItemInterface::LINK_EXTERNAL;
    $field_name = mb_strtolower($this
      ->randomMachineName());

    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
      'cardinality' => 1,
    ]);
    $this->fieldStorage
      ->save();
    FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'label' => 'Read more about this entity',
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
        'link_type' => $link_type,
      ],
    ])
      ->save();
    $this->container
      ->get('entity_type.manager')
      ->getStorage('entity_form_display')
      ->load('entity_test.entity_test.default')
      ->setComponent($field_name, [
      'type' => 'link_default',
    ])
      ->save();
    $form = \Drupal::service('entity.form_builder')
      ->getForm(EntityTest::create());
    $this
      ->assertEquals($link_type, $form[$field_name]['widget'][0]['uri']['#link_type']);
  }

  /**
   * Tests editing a link to a non-node entity.
   */
  public function testEditNonNodeEntityLink() {
    $entity_type_manager = \Drupal::entityTypeManager();
    $entity_test_storage = $entity_type_manager
      ->getStorage('entity_test');

    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => 'field_link',
      'entity_type' => 'entity_test',
      'type' => 'link',
      'cardinality' => 1,
    ]);
    $this->fieldStorage
      ->save();
    FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'label' => 'Read more about this entity',
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
      ],
    ])
      ->save();
    $entity_type_manager
      ->getStorage('entity_form_display')
      ->load('entity_test.entity_test.default')
      ->setComponent('field_link', [
      'type' => 'link_default',
    ])
      ->save();

    // Create a node and a test entity to have a possibly valid reference for
    // both. Create another test entity that references the first test entity.
    $entity_test_link = $entity_test_storage
      ->create([
      'name' => 'correct link target',
    ]);
    $entity_test_link
      ->save();

    // Create a node with the same ID as the test entity to ensure that the link
    // doesn't match incorrectly.
    $this
      ->drupalCreateNode([
      'title' => 'wrong link target',
    ]);
    $correct_link = 'entity:entity_test/' . $entity_test_link
      ->id();
    $entity_test = $entity_test_storage
      ->create([
      'name' => 'correct link target',
      'field_link' => $correct_link,
    ]);
    $entity_test
      ->save();

    // Edit the entity and save it, verify the correct link is kept and not
    // changed to point to a node. Currently, widget does not support non-node
    // autocomplete and therefore must show the link unaltered.
    $this
      ->drupalGet($entity_test
      ->toUrl('edit-form'));
    $this
      ->assertSession()
      ->fieldValueEquals('field_link[0][uri]', $correct_link);
    $this
      ->submitForm([], 'Save');
    $entity_test_storage
      ->resetCache();
    $entity_test = $entity_test_storage
      ->load($entity_test
      ->id());
    $this
      ->assertEquals($correct_link, $entity_test
      ->get('field_link')->uri);
  }

  /**
   * Tests <nolink> and <none> as link uri.
   */
  public function testNoLinkUri() {
    $field_name = mb_strtolower($this
      ->randomMachineName());
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
      'cardinality' => 1,
    ]);
    $this->fieldStorage
      ->save();
    FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'label' => 'Read more about this entity',
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
        'link_type' => LinkItemInterface::LINK_INTERNAL,
      ],
    ])
      ->save();
    $this->container
      ->get('entity_type.manager')
      ->getStorage('entity_form_display')
      ->load('entity_test.entity_test.default')
      ->setComponent($field_name, [
      'type' => 'link_default',
    ])
      ->save();
    EntityViewDisplay::create([
      'targetEntityType' => 'entity_test',
      'bundle' => 'entity_test',
      'mode' => 'full',
      'status' => TRUE,
    ])
      ->setComponent($field_name, [
      'type' => 'link',
    ])
      ->save();

    // Test a link with <nolink> uri.
    $edit = [
      "{$field_name}[0][title]" => 'Title, no link',
      "{$field_name}[0][uri]" => '<nolink>',
    ];
    $this
      ->drupalGet('/entity_test/add');
    $this
      ->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this
      ->getUrl(), $match);
    $id = $match[1];
    $output = $this
      ->renderTestEntity($id);
    $expected_link = (string) $this->container
      ->get('link_generator')
      ->generate('Title, no link', Url::fromUri('route:<nolink>'));
    $this
      ->assertStringContainsString($expected_link, $output);

    // Test a link with <none> uri.
    $edit = [
      "{$field_name}[0][title]" => 'Title, none',
      "{$field_name}[0][uri]" => '<none>',
    ];
    $this
      ->drupalGet('/entity_test/add');
    $this
      ->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this
      ->getUrl(), $match);
    $id = $match[1];
    $output = $this
      ->renderTestEntity($id);
    $expected_link = (string) $this->container
      ->get('link_generator')
      ->generate('Title, none', Url::fromUri('route:<none>'));
    $this
      ->assertStringContainsString($expected_link, $output);

    // Test a link with a <button> uri.
    $edit = [
      "{$field_name}[0][title]" => 'Title, button',
      "{$field_name}[0][uri]" => '<button>',
    ];
    $this
      ->drupalGet('/entity_test/add');
    $this
      ->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this
      ->getUrl(), $match);
    $id = $match[1];
    $output = $this
      ->renderTestEntity($id);
    $expected_link = (string) $this->container
      ->get('link_generator')
      ->generate('Title, button', Url::fromUri('route:<button>'));
    $this
      ->assertStringContainsString($expected_link, $output);
  }

  /**
   * Renders a test_entity and returns the output.
   *
   * @param int $id
   *   The test_entity ID to render.
   * @param string $view_mode
   *   (optional) The view mode to use for rendering.
   * @param bool $reset
   *   (optional) Whether to reset the entity_test storage cache. Defaults to
   *   TRUE to simplify testing.
   *
   * @return string
   *   The rendered HTML output.
   */
  protected function renderTestEntity($id, $view_mode = 'full', $reset = TRUE) {
    if ($reset) {
      $this->container
        ->get('entity_type.manager')
        ->getStorage('entity_test')
        ->resetCache([
        $id,
      ]);
    }
    $entity = EntityTest::load($id);
    $display = \Drupal::service('entity_display.repository')
      ->getViewDisplay($entity
      ->getEntityTypeId(), $entity
      ->bundle(), $view_mode);
    $content = $display
      ->build($entity);
    $output = \Drupal::service('renderer')
      ->renderRoot($content);
    return (string) $output;
  }

}

Classes

Name	Description
LinkFieldTest	Tests link field widgets and formatters.