class ImageTestBase

abstract class ImageTestBase extends CKEditor5TestBase {
    use CKEditor5TestTrait;
    use TestFileCreationTrait;
    
    /**
     * The user to use during testing.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * A host entity with a body field to embed images in.
     *
     * @var \Drupal\node\NodeInterface
     */
    protected $host;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'ckeditor5',
        'node',
        'text',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Provides the relevant image attributes.
     *
     * @return string[]
     */
    protected function imageAttributes() {
        return [
            'src' => base_path() . 'core/misc/druplicon.png',
            'width' => '88',
            'height' => '100',
        ];
    }
    
    /**
     * Helper to format attributes.
     *
     * @param bool $reverse
     *   Reverse attributes when printing them.
     *
     * @return string
     */
    protected function imageAttributesAsString($reverse = FALSE) {
        $string = [];
        foreach ($this->imageAttributes() as $key => $value) {
            $string[] = $key . '="' . $value . '"';
        }
        if ($reverse) {
            $string = array_reverse($string);
        }
        return implode(' ', $string);
    }
    
    /**
     * Add an image to the CKEditor 5 editable zone.
     */
    protected function addImage() {
        $page = $this->getSession()
            ->getPage();
        $src = $this->imageAttributes()['src'];
        $this->waitForEditor();
        $this->pressEditorButton('Insert image via URL');
        $panel = $page->find('css', '.ck-dropdown__panel  .ck-image-insert-url');
        $src_input = $panel->find('css', 'input[type=text]');
        $src_input->setValue($src);
        $panel->find('xpath', "//button[span[text()='Insert']]")
            ->click();
        // Wait for the image to be uploaded and rendered by CKEditor 5.
        $this->assertNotEmpty($this->assertSession()
            ->waitForElementVisible('css', '.ck-widget.image > img[src="' . $src . '"]'));
    }
    
    /**
     * Ensures that attributes are retained on conversion.
     */
    public function testAttributeRetentionDuringUpcasting() : void {
        // Run test cases in a single test to make the test run faster.
        $attributes_to_retain = [
            '-none-' => 'inline',
            'data-caption="test caption 🦙"' => 'block',
            'data-align="left"' => 'inline',
        ];
        foreach ($attributes_to_retain as $attribute_to_retain => $expected_upcast_behavior_when_wrapped_in_block_element) {
            if ($attribute_to_retain === '-none-') {
                $attribute_to_retain = '';
            }
            $img_tag = '<img ' . $attribute_to_retain . ' alt="drupalimage test image" ' . $this->imageAttributesAsString() . ' />';
            $test_cases = [
                // Plain image tag for a baseline.
[
                    $img_tag,
                    $img_tag,
                ],
                // Image tag wrapped with <p>.
[
                    "<p>{$img_tag}</p>",
                    $expected_upcast_behavior_when_wrapped_in_block_element === 'inline' ? "<p>{$img_tag}</p>" : $img_tag,
                ],
                // Image tag wrapped with a disallowed paragraph-like element (<div).
                // When inline is the expected upcast behavior, it will wrap in <p>
                // because it still must wrap in a paragraph-like element, and <p> is
                // available to be that element.
[
                    "<div>{$img_tag}</div>",
                    $expected_upcast_behavior_when_wrapped_in_block_element === 'inline' ? "<p>{$img_tag}</p>" : $img_tag,
                ],
            ];
            foreach ($test_cases as $test_case) {
                [
                    $markup,
                    $expected,
                ] = $test_case;
                $this->host->body->value = $markup;
                $this->host
                    ->save();
                $this->drupalGet($this->host
                    ->toUrl('edit-form'));
                $this->waitForEditor();
                // Ensure that the image is rendered in preview.
                $this->assertNotEmpty($this->assertSession()
                    ->waitForElementVisible('css', ".ck-content .ck-widget img"));
                $editor_dom = $this->getEditorDataAsDom();
                $expected_dom = Html::load($expected);
                $xpath = new \DOMXPath($this->getEditorDataAsDom());
                $this->assertEquals($expected_dom->getElementsByTagName('body')
                    ->item(0)
                    ->C14N(), $editor_dom->getElementsByTagName('body')
                    ->item(0)
                    ->C14N());
                // Ensure the test attribute is persisted on downcast.
                if ($attribute_to_retain) {
                    $this->assertNotEmpty($xpath->query("//img[@{$attribute_to_retain}]"));
                }
            }
        }
    }
    
    /**
     * Tests that arbitrary attributes are allowed via GHS.
     */
    public function testImageArbitraryHtml() : void {
        $editor = Editor::load('test_format');
        $settings = $editor->getSettings();
        // Allow the data-foo attribute in img via GHS.
        $settings['plugins']['ckeditor5_sourceEditing']['allowed_tags'] = [
            '<img data-foo>',
        ];
        $editor->setSettings($settings);
        $editor->save();
        $format = FilterFormat::load('test_format');
        $original_config = $format->filters('filter_html')
            ->getConfiguration();
        foreach ($this->providerLinkability() as $data) {
            [
                $image_type,
                $unrestricted,
            ] = $data;
            $format_config = $unrestricted ? [
                'status' => FALSE,
            ] : $original_config;
            $format->setFilterConfig('filter_html', $format_config)
                ->save();
            // Make the test content have either a block image or an inline image.
            $img_tag = '<img data-foo="bar" alt="drupalimage test image" data-entity-type="file" ' . $this->imageAttributesAsString() . ' />';
            $this->host->body->value .= $image_type === 'block' ? $img_tag : "<p>{$img_tag}</p>";
            $this->host
                ->save();
            $expected_widget_selector = $image_type === 'block' ? 'image img' : 'image-inline';
            $this->drupalGet($this->host
                ->toUrl('edit-form'));
            $this->waitForEditor();
            $drupalimage = $this->assertSession()
                ->waitForElementVisible('css', ".ck-content .ck-widget.{$expected_widget_selector}");
            $this->assertNotEmpty($drupalimage);
            $this->assertEquals('bar', $drupalimage->getAttribute('data-foo'));
            $xpath = new \DOMXPath($this->getEditorDataAsDom());
            $this->assertNotEmpty($xpath->query('//img[@data-foo="bar"]'));
        }
    }
    
    /**
     * Tests linkability of the image CKEditor widget.
     *
     * Due to the complex overrides that `drupalImage.DrupalImage` is making, this
     * is explicitly testing the "editingDowncast" and "dataDowncast" results.
     * These are CKEditor 5 concepts.
     *
     * @see https://ckeditor.com/docs/ckeditor5/latest/framework/guides/architecture/editing-engine.html#conversion
     */
    public function testLinkability() : void {
        $format = FilterFormat::load('test_format');
        $original_config = $format->filters('filter_html')
            ->getConfiguration();
        $original_body_value = $this->host->body->value;
        foreach ($this->providerLinkability() as $data) {
            [
                $image_type,
                $unrestricted,
            ] = $data;
            assert($image_type === 'inline' || $image_type === 'block');
            $format_config = $unrestricted ? [
                'status' => FALSE,
            ] : $original_config;
            $format->setFilterConfig('filter_html', $format_config)
                ->save();
            // Make the test content have either a block image or an inline image.
            $img_tag = '<img alt="drupalimage test image" data-entity-type="file" ' . $this->imageAttributesAsString() . ' />';
            $this->host->body->value = $original_body_value . ($image_type === 'block' ? $img_tag : "<p>{$img_tag}</p>");
            $this->host
                ->save();
            $this->drupalGet($this->host
                ->toUrl('edit-form'));
            $page = $this->getSession()
                ->getPage();
            // Adjust the expectations accordingly.
            $expected_widget_class = $image_type === 'block' ? 'image' : 'image-inline';
            $this->waitForEditor();
            $assert_session = $this->assertSession();
            // Initial state: the image CKEditor Widget is not selected.
            $drupalimage = $assert_session->waitForElementVisible('css', ".ck-content .ck-widget.{$expected_widget_class}");
            $this->assertNotEmpty($drupalimage);
            $this->assertFalse($drupalimage->hasClass('.ck-widget_selected'));
            $src = basename($this->imageAttributes()['src']);
            // Assert the "editingDowncast" HTML before making changes.
            $assert_session->elementExists('css', '.ck-content .ck-widget.' . $expected_widget_class . ' > img[src*="' . $src . '"][alt="drupalimage test image"]');
            // Assert the "dataDowncast" HTML before making changes.
            $xpath = new \DOMXPath($this->getEditorDataAsDom());
            $this->assertNotEmpty($xpath->query('//img[@alt="drupalimage test image"]'));
            $this->assertEmpty($xpath->query('//a'));
            // Assert the link button is present and not pressed.
            $link_button = $this->getEditorButton('Link');
            $this->assertSame('false', $link_button->getAttribute('aria-pressed'));
            // Tests linking images.
            $drupalimage->click();
            $this->assertTrue($drupalimage->hasClass('ck-widget_selected'));
            $this->assertEditorButtonEnabled('Link');
            // Assert structure of image toolbar balloon.
            $this->assertVisibleBalloon('.ck-toolbar[aria-label="Image toolbar"]');
            $link_image_button = $this->getBalloonButton('Link image');
            // Click the "Link image" button.
            $this->assertSame('false', $link_image_button->getAttribute('aria-pressed'));
            $link_image_button->press();
            // Assert structure of link form balloon.
            $balloon = $this->assertVisibleBalloon('.ck-link-form');
            $url_input = $balloon->find('css', '.ck-labeled-field-view__input-wrapper .ck-input-text');
            // Fill in link form balloon's <input> and hit "Save".
            $url_input->setValue('http://www.drupal.org/association');
            $balloon->pressButton('Save');
            // Assert the "editingDowncast" HTML after making changes. First assert the
            // link exists, then assert the expected DOM structure in detail.
            $assert_session->elementExists('css', '.ck-content a[href*="//www.drupal.org/association"]');
            // For inline images, the link is wrapping the widget; for block images the
            // link lives inside the widget. (This is how it is implemented upstream, it
            // could be implemented differently, we just want to ensure we do not break
            // it. Drupal only cares about having its own "dataDowncast", the
            // "editingDowncast" is considered an implementation detail.)
            $assert_session->elementExists('css', $image_type === 'inline' ? '.ck-content a[href*="//www.drupal.org/association"] .ck-widget.' . $expected_widget_class . ' > img[src*="' . $src . '"][alt="drupalimage test image"]' : '.ck-content .ck-widget.' . $expected_widget_class . ' a[href*="//www.drupal.org/association"] > img[src*="' . $src . '"][alt="drupalimage test image"]');
            // Assert the "dataDowncast" HTML after making changes.
            $xpath = new \DOMXPath($this->getEditorDataAsDom());
            $this->assertCount(1, $xpath->query('//a[@href="http://www.drupal.org/association"]/img[@alt="drupalimage test image"]'));
            $this->assertEmpty($xpath->query('//a[@href="http://www.drupal.org/association" and @class="trusted"]'));
            // Add `class="trusted"` to the link.
            $xpath = new \DOMXPath($this->getEditorDataAsDom());
            $this->assertEmpty($xpath->query('//a[@href="http://www.drupal.org/association" and @class="trusted"]'));
            $this->pressEditorButton('Source');
            $source_text_area = $assert_session->waitForElement('css', '.ck-source-editing-area textarea');
            $this->assertNotEmpty($source_text_area);
            $new_value = str_replace('<a ', '<a class="trusted" ', $source_text_area->getValue());
            $source_text_area->setValue('<p>temp</p>');
            $source_text_area->setValue($new_value);
            $this->pressEditorButton('Source');
            // When unrestricted, additional attributes on links should be retained.
            $xpath = new \DOMXPath($this->getEditorDataAsDom());
            $this->assertCount($unrestricted ? 1 : 0, $xpath->query('//a[@href="http://www.drupal.org/association" and @class="trusted"]'));
            // Save the entity whose text field is being edited.
            $page->pressButton('Save');
            // Assert the HTML the end user sees.
            $assert_session->elementExists('css', $unrestricted ? 'a[href="http://www.drupal.org/association"].trusted img[src*="' . $src . '"]' : 'a[href="http://www.drupal.org/association"] img[src*="' . $src . '"]');
            // Go back to edit the now *linked* <drupal-media>. Everything from this
            // point onwards is effectively testing "upcasting" and proving there is no
            // data loss.
            $this->drupalGet($this->host
                ->toUrl('edit-form'));
            $this->waitForEditor();
            // Assert the "dataDowncast" HTML before making changes.
            $xpath = new \DOMXPath($this->getEditorDataAsDom());
            $this->assertNotEmpty($xpath->query('//img[@alt="drupalimage test image"]'));
            $this->assertNotEmpty($xpath->query('//a[@href="http://www.drupal.org/association"]'));
            $this->assertNotEmpty($xpath->query('//a[@href="http://www.drupal.org/association"]/img[@alt="drupalimage test image"]'));
            $this->assertCount($unrestricted ? 1 : 0, $xpath->query('//a[@href="http://www.drupal.org/association" and @class="trusted"]'));
            // Tests unlinking images.
            $drupalimage->click();
            $this->assertEditorButtonEnabled('Link');
            $this->assertSame('true', $this->getEditorButton('Link')
                ->getAttribute('aria-pressed'));
            // Assert structure of image toolbar balloon.
            $this->assertVisibleBalloon('.ck-toolbar[aria-label="Image toolbar"]');
            $link_image_button = $this->getBalloonButton('Link image');
            $this->assertSame('true', $link_image_button->getAttribute('aria-pressed'));
            $link_image_button->click();
            // Assert structure of link actions balloon.
            $this->getBalloonButton('Edit link');
            $unlink_image_button = $this->getBalloonButton('Unlink');
            // Click the "Unlink" button.
            $unlink_image_button->click();
            $this->assertSame('false', $this->getEditorButton('Link')
                ->getAttribute('aria-pressed'));
            // Assert the "editingDowncast" HTML after making changes. Assert the
            // widget exists but not the link, or *any* link for that matter. Then
            // assert the expected DOM structure in detail.
            $assert_session->elementExists('css', '.ck-content .ck-widget.' . $expected_widget_class);
            $assert_session->elementNotExists('css', '.ck-content a');
            $assert_session->elementExists('css', '.ck-content .ck-widget.' . $expected_widget_class . ' > img[src*="' . $src . '"][alt="drupalimage test image"]');
            // Assert the "dataDowncast" HTML after making changes.
            $xpath = new \DOMXPath($this->getEditorDataAsDom());
            $this->assertCount(0, $xpath->query('//a[@href="http://www.drupal.org/association"]/img[@alt="drupalimage test image"]'));
            $this->assertCount(1, $xpath->query('//img[@alt="drupalimage test image"]'));
            $this->assertCount(0, $xpath->query('//a'));
        }
    }
    
    /**
     * Tests that alt text is required for images.
     *
     * @see https://ckeditor.com/docs/ckeditor5/latest/framework/guides/architecture/editing-engine.html#conversion
     *
     * @dataProvider providerAltTextRequired
     */
    public function testAltTextRequired(bool $unrestricted) : void {
        // Disable filter_html.
        if ($unrestricted) {
            FilterFormat::load('test_format')->setFilterConfig('filter_html', [
                'status' => FALSE,
            ])
                ->save();
        }
        // Make the test content has a block image and an inline image.
        $img_tag = preg_replace('/width="\\d+" height="\\d+"/', 'width="500"', '<img ' . $this->imageAttributesAsString() . ' />');
        $this->host->body->value .= $img_tag . "<p>{$img_tag}</p>";
        $this->host
            ->save();
        $page = $this->getSession()
            ->getPage();
        $this->drupalGet($this->host
            ->toUrl('edit-form'));
        $this->waitForEditor();
        $assert_session = $this->assertSession();
        // Confirm both of the images exist.
        $this->assertNotEmpty($image_block = $assert_session->waitForElementVisible('css', ".ck-content .ck-widget.image"));
        $this->assertNotEmpty($image_inline = $assert_session->waitForElementVisible('css', ".ck-content .ck-widget.image-inline"));
        // Confirm both of the images have an alt text required warning.
        $this->assertNotEmpty($image_block->find('css', '.image-alternative-text-missing-wrapper'));
        $this->assertNotEmpty($image_inline->find('css', '.image-alternative-text-missing-wrapper'));
        // Add alt text to the block image.
        $image_block->find('css', '.image-alternative-text-missing button')
            ->click();
        $this->assertNotEmpty($assert_session->waitForElementVisible('css', '.ck-balloon-panel'));
        $this->assertVisibleBalloon('.ck-text-alternative-form');
        // Ensure that the missing alt text warning is hidden when the alternative
        // text form is open.
        $assert_session->waitForElement('css', '.ck-content .ck-widget.image .image-alternative-text-missing.ck-hidden');
        $assert_session->elementExists('css', '.ck-content .ck-widget.image-inline .image-alternative-text-missing');
        $assert_session->elementNotExists('css', '.ck-content .ck-widget.image-inline .image-alternative-text-missing.ck-hidden');
        // Ensure that the missing alt text error is not added to decorative images.
        $this->assertNotEmpty($decorative_button = $this->getBalloonButton('Decorative image'));
        $assert_session->elementExists('css', '.ck-balloon-panel .ck-text-alternative-form input[type=text]');
        $decorative_button->click();
        $assert_session->elementExists('css', '.ck-content .ck-widget.image .image-alternative-text-missing.ck-hidden');
        $assert_session->elementExists('css', ".ck-content .ck-widget.image-inline .image-alternative-text-missing-wrapper");
        $assert_session->elementNotExists('css', '.ck-content .ck-widget.image-inline .image-alternative-text-missing.ck-hidden');
        // Ensure that the missing alt text error is removed after saving the
        // changes.
        $this->assertNotEmpty($save_button = $this->getBalloonButton('Save'));
        $save_button->click();
        $this->assertTrue($assert_session->waitForElementRemoved('css', ".ck-content .ck-widget.image .image-alternative-text-missing-wrapper"));
        $assert_session->elementExists('css', '.ck-content .ck-widget.image-inline .image-alternative-text-missing-wrapper');
        // Ensure that the decorative image downcasts into empty alt attribute.
        $editor_dom = $this->getEditorDataAsDom();
        $decorative_img = $editor_dom->getElementsByTagName('img')
            ->item(0);
        $this->assertTrue($decorative_img->hasAttribute('alt'));
        $this->assertEmpty($decorative_img->getAttribute('alt'));
        // Ensure that missing alt text error is not added to images with alt text.
        $this->assertNotEmpty($alt_text_button = $this->getBalloonButton('Change image alternative text'));
        $alt_text_button->click();
        $decorative_button->click();
        $this->assertNotEmpty($save_button = $this->getBalloonButton('Save'));
        $this->assertTrue($save_button->hasClass('ck-disabled'));
        $this->assertNotEmpty($alt_override_input = $page->find('css', '.ck-balloon-panel .ck-text-alternative-form input[type=text]'));
        $alt_override_input->setValue('There is now alt text');
        $this->assertTrue($assert_session->waitForElementRemoved('css', '.ck-balloon-panel .ck-text-alternative-form .ck-disabled'));
        $this->assertFalse($save_button->hasClass('ck-disabled'));
        $save_button->click();
        // Save the node and confirm that the alt text is retained.
        $page->pressButton('Save');
        $this->assertNotEmpty($assert_session->waitForElement('css', 'img[alt="There is now alt text"]'));
        // Ensure that alt form is opened after image upload.
        $this->drupalGet($this->host
            ->toUrl('edit-form'));
        $this->waitForEditor();
        $this->addImage();
        $this->assertNotEmpty($assert_session->waitForElementVisible('css', '.ck-text-alternative-form'));
        $this->assertVisibleBalloon('.ck-text-alternative-form');
    }
    public static function providerAltTextRequired() : array {
        return [
            'Restricted' => [
                FALSE,
            ],
            'Unrestricted' => [
                TRUE,
            ],
        ];
    }
    protected function providerLinkability() : array {
        return [
            'BLOCK image, restricted' => [
                'block',
                FALSE,
            ],
            'BLOCK image, unrestricted' => [
                'block',
                TRUE,
            ],
            'INLINE image, restricted' => [
                'inline',
                FALSE,
            ],
            'INLINE image, unrestricted' => [
                'inline',
                TRUE,
            ],
        ];
    }
    
    /**
     * Tests alignment integration.
     *
     * @dataProvider providerAlignment
     */
    public function testAlignment(string $image_type) : void {
        $assert_session = $this->assertSession();
        $page = $this->getSession()
            ->getPage();
        // Make the test content have either a block image or an inline image.
        $img_tag = '<img alt="drupalimage test image" ' . $this->imageAttributesAsString() . ' />';
        $this->host->body->value .= $image_type === 'block' ? $img_tag : "<p>{$img_tag}</p>";
        $this->host
            ->save();
        $image_selector = $image_type === 'block' ? '.ck-widget.image' : '.ck-widget.image-inline';
        $default_alignment = $image_type === 'block' ? 'Break text' : 'In line';
        $this->drupalGet($this->host
            ->toUrl('edit-form'));
        $this->waitForEditor();
        $this->assertNotEmpty($assert_session->waitForElementVisible('css', $image_selector));
        // Ensure that the default alignment option matches expectation.
        $this->click($image_selector);
        $this->assertVisibleBalloon('[aria-label="Image toolbar"]');
        $this->assertTrue($this->getBalloonButton($default_alignment)
            ->hasClass('ck-on'));
        $editor_dom = $this->getEditorDataAsDom();
        $drupal_media_element = $editor_dom->getElementsByTagName('img')
            ->item(0);
        $this->assertFalse($drupal_media_element->hasAttribute('data-align'));
        $this->getBalloonButton('Align center and break text')
            ->click();
        // Assert the alignment class exists after editing downcast.
        $this->assertNotEmpty($assert_session->waitForElement('css', '.ck-widget.image.image-style-align-center'));
        $editor_dom = $this->getEditorDataAsDom();
        $drupal_media_element = $editor_dom->getElementsByTagName('img')
            ->item(0);
        $this->assertEquals('center', $drupal_media_element->getAttribute('data-align'));
        $page->pressButton('Save');
        // Check that the 'content has been updated' message status appears to confirm we left the editor.
        $this->assertNotEmpty($assert_session->waitForElementVisible('css', '[data-drupal-messages]'));
        // Check that the class is correct in the front end.
        $assert_session->elementExists('css', 'img.align-center');
        // Go back to the editor to check that the alignment class still exists.
        $edit_url = $this->getSession()
            ->getCurrentURL() . '/edit';
        $this->drupalGet($edit_url);
        $this->waitForEditor();
        $assert_session->elementExists('css', '.ck-widget.image.image-style-align-center');
        // Ensure that "Centered image" alignment option is selected.
        $this->click('.ck-widget.image');
        $this->assertVisibleBalloon('[aria-label="Image toolbar"]');
        $this->assertTrue($this->getBalloonButton('Align center and break text')
            ->hasClass('ck-on'));
        $this->getBalloonButton('Break text')
            ->click();
        $this->assertTrue($assert_session->waitForElementRemoved('css', '.ck-widget.image.image-style-align-center'));
        $editor_dom = $this->getEditorDataAsDom();
        $drupal_media_element = $editor_dom->getElementsByTagName('img')
            ->item(0);
        $this->assertFalse($drupal_media_element->hasAttribute('data-align'));
    }
    public static function providerAlignment() {
        return [
            'Block image' => [
                'block',
            ],
            'Inline image' => [
                'inline',
            ],
        ];
    }
    
    /**
     * Ensures that width attribute upcasts and downcasts correctly.
     *
     * @param string $width
     *   The width input for the image.
     *
     * @dataProvider providerWidth
     */
    public function testWidth(string $width) : void {
        $page = $this->getSession()
            ->getPage();
        $assert_session = $this->assertSession();
        // Despite the absence of a `height` attribute on the `<img>`, CKEditor 5
        // should generate an appropriate `height`, matching with the aspect ratio
        // of the image.
        $expected_computed_height = $width;
        if (!str_ends_with($width, '%')) {
            $ratio = $width / (int) $this->imageAttributes()['width'];
            $expected_computed_height = (string) (int) round($ratio * (int) $this->imageAttributes()['height']);
        }
        // Add image to the host body.
        $this->host->body->value = sprintf('<img data-foo="bar" alt="drupalimage test image" ' . $this->imageAttributesAsString() . ' width="%s" />', $width);
        $this->host
            ->save();
        $this->drupalGet($this->host
            ->toUrl('edit-form'));
        $this->waitForEditor();
        // Ensure that the image is upcast as expected. In the editing view, the
        // width attribute should downcast to an inline style on the container
        // element.
        $assert_session->waitForElementVisible('css', ".ck-widget.image");
        $this->assertNotEmpty($assert_session->waitForElementVisible('css', ".ck-widget.image[style] img"));
        // Ensure that the width attribute is retained on downcast.
        $editor_data = $this->getEditorDataAsDom();
        $img_in_editor = $editor_data->getElementsByTagName('img')
            ->item(0);
        $this->assertSame($width, $img_in_editor->getAttribute('width'));
        $this->assertSame($expected_computed_height, $img_in_editor->getAttribute('height'));
        // Save the node and ensure that the width attribute is retained, and ensure
        // that a natural image ratio-respecting height attribute has been added.
        $page->pressButton('Save');
        $this->assertNotEmpty($assert_session->waitForElement('css', "img[width='{$width}'][height='{$expected_computed_height}']"));
    }
    
    /**
     * Ensures that images can have caption set.
     */
    public function testImageCaption() : void {
        $page = $this->getSession()
            ->getPage();
        $assert_session = $this->assertSession();
        // The foo attribute is added to be removed later by CKEditor 5 to make sure
        // CKEditor 5 was able to downcast data.
        $img_tag = '<img ' . $this->imageAttributesAsString() . ' alt="drupalimage test image" data-caption="Alpacas &lt;em&gt;are&lt;/em&gt; cute&lt;br&gt;really!" foo="bar">';
        $this->host->body->value = $img_tag;
        $this->host
            ->save();
        $this->drupalGet($this->host
            ->toUrl('edit-form'));
        $this->waitForEditor();
        $this->assertNotEmpty($assert_session->waitForElement('css', '.ck-editor'));
        $this->assertNotEmpty($figcaption = $assert_session->waitForElement('css', '.image figcaption'));
        $this->assertSame('Alpacas <em>are</em> cute<br>really!', $figcaption->getHtml());
        $page->pressButton('Source');
        $editor_dom = $this->getEditorDataAsDom();
        $data_caption = $editor_dom->getElementsByTagName('img')
            ->item(0)
            ->getAttribute('data-caption');
        $this->assertSame('Alpacas <em>are</em> cute<br>really!', $data_caption);
        $page->pressButton('Save');
        $src = $this->imageAttributes()['src'];
        $expected = '<img ' . $this->imageAttributesAsString(TRUE) . ' alt="drupalimage test image" data-caption="Alpacas &lt;em&gt;are&lt;/em&gt; cute&lt;br&gt;really!">';
        $expected_dom = Html::load($expected);
        $this->assertEquals($expected_dom->getElementsByTagName('body')
            ->item(0)
            ->C14N(), $editor_dom->getElementsByTagName('body')
            ->item(0)
            ->C14N());
        $assert_session->elementExists('xpath', '//figure/img[@src="' . $src . '" and not(@data-caption)]');
        $assert_session->responseContains('<figcaption>Alpacas <em>are</em> cute<br>really!</figcaption>');
    }
    
    /**
     * Data provider for ::testWidth().
     *
     * @return string[][]
     */
    public static function providerWidth() : array {
        return [
            'Image resize with percent unit (only allowed in HTML 4)' => [
                'width' => '33%',
            ],
            'Image resize with (implied) px unit' => [
                'width' => '100',
            ],
        ];
    }
    
    /**
     * Tests the image resize plugin.
     *
     * Confirms that enabling the resize plugin introduces the resize class to
     * images within CKEditor 5.
     *
     * @param bool $is_resize_enabled
     *   Boolean flag to test enabled or disabled.
     *
     * @dataProvider providerResize
     */
    public function testResize(bool $is_resize_enabled) : void {
        // Disable resize plugin because it is enabled by default.
        if (!$is_resize_enabled) {
            Editor::load('test_format')->setSettings([
                'toolbar' => [
                    'items' => [
                        'drupalInsertImage',
                    ],
                ],
                'plugins' => [
                    'ckeditor5_imageResize' => [
                        'allow_resize' => FALSE,
                    ],
                ],
            ])
                ->save();
        }
        $page = $this->getSession()
            ->getPage();
        $assert_session = $this->assertSession();
        $this->drupalGet('node/add');
        $page->fillField('title[0][value]', 'My test content');
        $this->addImage();
        $image_figure = $assert_session->waitForElementVisible('css', 'figure');
        $this->assertSame($is_resize_enabled, $image_figure->hasClass('ck-widget_with-resizer'));
    }
    
    /**
     * Data provider for ::testResize().
     *
     * @return array
     *   The test cases.
     */
    public static function providerResize() : array {
        return [
            'Image resize is enabled' => [
                'is_resize_enabled' => TRUE,
            ],
            'Image resize is disabled' => [
                'is_resize_enabled' => FALSE,
            ],
        ];
    }

}