comparison core/modules/link/tests/src/Functional/LinkFieldTest.php @ 0:4c8ae668cc8c

Initial import (non-working)

+<?php
+
+namespace Drupal\Tests\link\Functional;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Component\Utility\Unicode;
+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;
+
+/**
+ * Tests link field widgets and formatters.
+ *
+ * @group link
+ */
+class LinkFieldTest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['entity_test', 'link', 'node'];
+
+  /**
+   * 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() {
+    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() {
+    $field_name = Unicode::strtolower($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,
+      ],
+    ]);
+    $this->field->save();
+    entity_get_form_display('entity_test', 'entity_test', 'default')
+      ->setComponent($field_name, [
+        'type' => 'link_default',
+        'settings' => [
+          'placeholder_url' => 'http://example.com',
+        ],
+      ])
+      ->save();
+    entity_get_display('entity_test', 'entity_test', 'full')
+      ->setComponent($field_name, [
+        'type' => 'link',
+      ])
+      ->save();
+
+    // Display creation form.
+    $this->drupalGet('entity_test/add');
+    $this->assertFieldByName("{$field_name}[0][uri]", '', 'Link URL field is displayed');
+    $this->assertRaw('placeholder="http://example.com"');
+
+    // Create a path alias.
+    \Drupal::service('path.alias_storage')->save('/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',
+
+      // @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',
+
+      // 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 /, ? or #.';
+    $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->drupalPostForm('entity_test/add', $edit, t('Save'));
+      preg_match('|entity_test/manage/(\d+)|', $this->getUrl(), $match);
+      $id = $match[1];
+      $this->assertText(t('entity_test @id has been created.', ['@id' => $id]));
+      $this->assertRaw($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->drupalPostForm('entity_test/add', $edit, t('Save'));
+      $this->assertText(t($error_message, ['@link_path' => $invalid_value]));
+    }
+  }
+
+  /**
+   * Tests the link title settings of a link field.
+   */
+  public function testLinkTitle() {
+    $field_name = Unicode::strtolower($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,
+      ],
+    ]);
+    $this->field->save();
+    entity_get_form_display('entity_test', 'entity_test', 'default')
+      ->setComponent($field_name, [
+        'type' => 'link_default',
+        'settings' => [
+          'placeholder_url' => 'http://example.com',
+          'placeholder_title' => 'Enter the text for this link',
+        ],
+      ])
+      ->save();
+    entity_get_display('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->assertText('Read more about this entity');
+      $this->assertFieldByName("{$field_name}[0][uri]", '', 'URL field found.');
+      $this->assertRaw('placeholder="http://example.com"');
+
+      if ($title_setting === DRUPAL_DISABLED) {
+        $this->assertNoFieldByName("{$field_name}[0][title]", '', 'Link text field not found.');
+        $this->assertNoRaw('placeholder="Enter the text for this link"');
+      }
+      else {
+        $this->assertRaw('placeholder="Enter the text for this link"');
+
+        $this->assertFieldByName("{$field_name}[0][title]", '', 'Link text field found.');
+        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->drupalPostForm(NULL, $edit, t('Save'));
+          $this->assertText(t('@name field is required.', ['@name' => t('Link text')]));
+
+          // Verify that the link text is not required, if the URL is empty.
+          $edit = [
+            "{$field_name}[0][uri]" => '',
+          ];
+          $this->drupalPostForm(NULL, $edit, t('Save'));
+          $this->assertNoText(t('@name field is required.', ['@name' => t('Link text')]));
+
+          // 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->drupalPostForm(NULL, $edit, t('Save'));
+          $this->assertNoText(t('@name field is required.', ['@name' => t('Link text')]));
+        }
+      }
+    }
+
+    // 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->drupalPostForm(NULL, $edit, t('Save'));
+    preg_match('|entity_test/manage/(\d+)|', $this->getUrl(), $match);
+    $id = $match[1];
+    $this->assertText(t('entity_test @id has been created.', ['@id' => $id]));
+
+    $output = $this->renderTestEntity($id);
+    $expected_link = (string) \Drupal::l($value, Url::fromUri($value));
+    $this->assertContains($expected_link, $output);
+
+    // Verify that a link with text is rendered using the link text.
+    $title = $this->randomMachineName();
+    $edit = [
+      "{$field_name}[0][title]" => $title,
+    ];
+    $this->drupalPostForm("entity_test/manage/$id/edit", $edit, t('Save'));
+    $this->assertText(t('entity_test @id has been updated.', ['@id' => $id]));
+
+    $output = $this->renderTestEntity($id);
+    $expected_link = (string) \Drupal::l($title, Url::fromUri($value));
+    $this->assertContains($expected_link, $output);
+  }
+
+  /**
+   * Tests the default 'link' formatter.
+   */
+  public function testLinkFormatter() {
+    $field_name = Unicode::strtolower($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' => $this->fieldStorage,
+      'label' => 'Read more about this entity',
+      'bundle' => 'entity_test',
+      'settings' => [
+        'title' => DRUPAL_OPTIONAL,
+        'link_type' => LinkItemInterface::LINK_GENERIC,
+      ],
+    ])->save();
+    entity_get_form_display('entity_test', 'entity_test', 'default')
+      ->setComponent($field_name, [
+        'type' => 'link_default',
+      ])
+      ->save();
+    $display_options = [
+      'type' => 'link',
+      'label' => 'hidden',
+    ];
+    entity_get_display('entity_test', 'entity_test', 'full')
+      ->setComponent($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->assertText('Read more about this entity');
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+    preg_match('|entity_test/manage/(\d+)|', $this->getUrl(), $match);
+    $id = $match[1];
+    $this->assertText(t('entity_test @id has been created.', ['@id' => $id]));
+
+    // 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'] = $new_value;
+        }
+        entity_get_display('entity_test', 'entity_test', 'full')
+          ->setComponent($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;
+            $this->assertContains('<a href="' . Html::escape($url) . '">' . Html::escape($title) . '</a>', $output);
+
+            $url = $url2;
+            $title = isset($new_value) ? Unicode::truncate($title2, $new_value, FALSE, TRUE) : $title2;
+            $this->assertContains('<a href="' . Html::escape($url) . '">' . Html::escape($title) . '</a>', $output);
+
+            $url = $url3;
+            $title = isset($new_value) ? Unicode::truncate($title3, $new_value, FALSE, TRUE) : $title3;
+            $this->assertContains('<a href="' . Html::escape($url) . '">' . Html::escape($title) . '</a>', $output);
+            break;
+
+          case 'rel':
+            $rel = isset($new_value) ? ' rel="' . $new_value . '"' : '';
+            $this->assertContains('<a href="' . Html::escape($url1) . '"' . $rel . '>' . Html::escape($title1) . '</a>', $output);
+            $this->assertContains('<a href="' . Html::escape($url2) . '"' . $rel . '>' . Html::escape($title2) . '</a>', $output);
+            $this->assertContains('<a href="' . Html::escape($url3) . '"' . $rel . '>' . Html::escape($title3) . '</a>', $output);
+            break;
+
+          case 'target':
+            $target = isset($new_value) ? ' target="' . $new_value . '"' : '';
+            $this->assertContains('<a href="' . Html::escape($url1) . '"' . $target . '>' . Html::escape($title1) . '</a>', $output);
+            $this->assertContains('<a href="' . Html::escape($url2) . '"' . $target . '>' . Html::escape($title2) . '</a>', $output);
+            $this->assertContains('<a href="' . Html::escape($url3) . '"' . $target . '>' . Html::escape($title3) . '</a>', $output);
+            break;
+
+          case 'url_only':
+            // In this case, $new_value is an array.
+            if (!$new_value['url_only']) {
+              $this->assertContains('<a href="' . Html::escape($url1) . '">' . Html::escape($title1) . '</a>', $output);
+              $this->assertContains('<a href="' . Html::escape($url2) . '">' . Html::escape($title2) . '</a>', $output);
+              $this->assertContains('<a href="' . Html::escape($url3) . '">' . Html::escape($title3) . '</a>', $output);
+            }
+            else {
+              if (empty($new_value['url_plain'])) {
+                $this->assertContains('<a href="' . Html::escape($url1) . '">' . Html::escape($url1) . '</a>', $output);
+                $this->assertContains('<a href="' . Html::escape($url2) . '">' . Html::escape($url2) . '</a>', $output);
+                $this->assertContains('<a href="' . Html::escape($url3) . '">' . Html::escape($url3) . '</a>', $output);
+              }
+              else {
+                $this->assertNotContains('<a href="' . Html::escape($url1) . '">' . Html::escape($url1) . '</a>', $output);
+                $this->assertNotContains('<a href="' . Html::escape($url2) . '">' . Html::escape($url2) . '</a>', $output);
+                $this->assertNotContains('<a href="' . Html::escape($url3) . '">' . Html::escape($url3) . '</a>', $output);
+                $this->assertContains(Html::escape($url1), $output);
+                $this->assertContains(Html::escape($url2), $output);
+                $this->assertContains(Html::escape($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() {
+    $field_name = Unicode::strtolower($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();
+    $display_options = [
+      'type' => 'link_separate',
+      'label' => 'hidden',
+    ];
+    entity_get_form_display('entity_test', 'entity_test', 'default')
+      ->setComponent($field_name, [
+        'type' => 'link_default',
+      ])
+      ->save();
+    entity_get_display('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->drupalPostForm(NULL, $edit, t('Save'));
+    preg_match('|entity_test/manage/(\d+)|', $this->getUrl(), $match);
+    $id = $match[1];
+    $this->assertText(t('entity_test @id has been created.', ['@id' => $id]));
+
+    // 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 => $new_value];
+        entity_get_display('entity_test', 'entity_test', 'full')
+          ->setComponent($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>';
+            $this->assertContains($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>';
+            $this->assertContains($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>';
+            $this->assertContains($expected, $output);
+            break;
+
+          case 'rel':
+            $rel = isset($new_value) ? ' rel="' . $new_value . '"' : '';
+            $this->assertContains('<div class="link-url"><a href="' . Html::escape($url1) . '"' . $rel . '>' . Html::escape($url1) . '</a></div>', $output);
+            $this->assertContains('<div class="link-url"><a href="' . Html::escape($url2) . '"' . $rel . '>' . Html::escape($url2) . '</a></div>', $output);
+            $this->assertContains('<div class="link-url"><a href="' . Html::escape($url3) . '"' . $rel . '>' . Html::escape($url3) . '</a></div>', $output);
+            break;
+
+          case 'target':
+            $target = isset($new_value) ? ' target="' . $new_value . '"' : '';
+            $this->assertContains('<div class="link-url"><a href="' . Html::escape($url1) . '"' . $target . '>' . Html::escape($url1) . '</a></div>', $output);
+            $this->assertContains('<div class="link-url"><a href="' . Html::escape($url2) . '"' . $target . '>' . Html::escape($url2) . '</a></div>', $output);
+            $this->assertContains('<div class="link-url"><a href="' . Html::escape($url3) . '"' . $target . '>' . Html::escape($url3) . '</a></div>', $output);
+            break;
+        }
+      }
+    }
+  }
+
+  /**
+   * Test '#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;
+    $field_name = Unicode::strtolower($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();
+
+    $this->container->get('entity.manager')
+      ->getStorage('entity_form_display')
+      ->load('entity_test.entity_test.default')
+      ->setComponent($field_name, [
+        'type' => 'link_default',
+      ])
+      ->save();
+
+    $form = \Drupal::service('entity.form_builder')->getForm(EntityTest::create());
+    $this->assertEqual($form[$field_name]['widget'][0]['uri']['#link_type'], $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();
+
+    $node = $this->drupalCreateNode(['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->drupalPostForm(NULL, [], 'Save');
+
+    $entity_test_storage->resetCache();
+    $entity_test = $entity_test_storage->load($entity_test->id());
+
+    $this->assertEquals($correct_link, $entity_test->get('field_link')->uri);
+  }
+
+  /**
+   * 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) {
+      $this->container->get('entity.manager')->getStorage('entity_test')->resetCache([$id]);
+    }
+    $entity = EntityTest::load($id);
+    $display = entity_get_display($entity->getEntityTypeId(), $entity->bundle(), $view_mode);
+    $content = $display->build($entity);
+    $output = \Drupal::service('renderer')->renderRoot($content);
+    $output = (string) $output;
+    $this->verbose($output);
+    return $output;
+  }
+
+}