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
     */
    public 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() {
        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');
        $this->assertFieldByName("{$field_name}[0][uri]", '', 'Link URL field is displayed');
        $this->assertRaw('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->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() {
        $field_name = mb_strtolower($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->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_OPTIONAL) {
                    // Verify that the URL is required, if the link text is non-empty.
                    $edit = [
                        "{$field_name}[0][title]" => 'Example',
                    ];
                    $this->drupalPostForm(NULL, $edit, t('Save'));
                    $this->assertText(t('The URL field is required when the @title field is specified.', [
                        '@title' => t('Link text'),
                    ]));
                }
                if ($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('@title field is required if there is @uri input.', [
                        '@title' => t('Link text'),
                        '@uri' => t('URL'),
                    ]));
                    // 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);
        $expected_link = (string) Link::fromTextAndUrl($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,
        ];
        $this->drupalPostForm("entity_test/manage/{$id}/edit", $edit, t('Save'));
        $this->assertText(t('entity_test @id has been updated.', [
            '@id' => $id,
        ]));
        $output = $this->renderTestEntity($id);
        $expected_link = (string) Link::fromTextAndUrl($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->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;
                }
                $display_repository->getViewDisplay('entity_test', 'entity_test', 'full')
                    ->setComponent($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->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,
                ];
                $display_repository->getViewDisplay('entity_test', 'entity_test', 'full')
                    ->setComponent($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;
                }
            }
        }
    }
    
    /**
     * 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;
        $field_name = mb_strtolower($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());
        $this->assertEqual($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();
        // 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->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);
    }
    
    /**
     * Test <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->drupalPostForm('/entity_test/add', $edit, t('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->drupalPostForm('/entity_test/add', $edit, t('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);
    }
    
    /**
     * 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);
        $output = (string) $output;
        $this->verbose($output);
        return $output;
    }

}