class MediaThumbnailFormatterTest

class MediaThumbnailFormatterTest extends MediaFunctionalTestBase {
    use TestFileCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests the media thumbnail field formatter.
     */
    public function testRender() : void {
        $this->drupalLogin($this->adminUser);
        
        /** @var \Drupal\node\NodeStorage $node_storage */
        $node_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('node');
        // Create an image media type for testing the formatter.
        $this->createMediaType('image', [
            'id' => 'image',
        ]);
        // Create an article content type.
        $this->drupalCreateContentType([
            'type' => 'article',
            'name' => 'Article',
        ]);
        // Creates an entity reference field for media.
        $field_storage = FieldStorageConfig::create([
            'field_name' => 'field_media_reference',
            'type' => 'entity_reference',
            'entity_type' => 'node',
            'cardinality' => 1,
            'settings' => [
                'target_type' => 'media',
            ],
        ]);
        $field_storage->save();
        FieldConfig::create([
            'field_storage' => $field_storage,
            'bundle' => 'article',
            'label' => 'Reference media',
            'translatable' => FALSE,
        ])->save();
        // Alter the form display.
        $this->container
            ->get('entity_display.repository')
            ->getFormDisplay('node', 'article')
            ->setComponent('field_media_reference', [
            'type' => 'entity_reference_autocomplete',
        ])
            ->save();
        // Change the image thumbnail to point into the media.
        $this->changeMediaReferenceFieldLinkType('media');
        // Create and upload a file to the media.
        $file = File::create([
            'uri' => current($this->getTestFiles('image'))->uri,
        ]);
        $file->save();
        $mediaImage = Media::create([
            'bundle' => 'image',
            'name' => 'Test image',
            'field_media_image' => $file->id(),
        ]);
        $mediaImage->save();
        // Save the article node.
        $title = $this->randomMachineName();
        $edit = [
            'title[0][value]' => $title,
        ];
        $edit['field_media_reference[0][target_id]'] = $mediaImage->getName();
        $this->drupalGet('node/add/article');
        $this->submitForm($edit, 'Save');
        // Validate the image being loaded with the media reference.
        $this->assertSession()
            ->responseContains('<a href="' . $mediaImage->toUrl('edit-form')
            ->toString());
        // Retrieve the created node.
        $node = $this->drupalGetNodeByTitle($title);
        $nid = $node->id();
        // Change the image thumbnail to point into the content node.
        $this->changeMediaReferenceFieldLinkType('content');
        $node_storage->resetCache([
            $nid,
        ]);
        $this->drupalGet('node/' . $nid);
        // Validate image being loaded with the content on the link.
        $this->assertSession()
            ->responseContains('<a href="' . $node->toUrl()
            ->toString());
        $this->assertSession()
            ->responseContains('loading="eager"');
    }
    
    /**
     * Helper function to change field display.
     *
     * @param string $type
     *   Image link type.
     */
    private function changeMediaReferenceFieldLinkType(string $type) : void {
        // Change the display to use the media thumbnail formatter with image link.
        $this->container
            ->get('entity_display.repository')
            ->getViewDisplay('node', 'article', 'default')
            ->setComponent('field_media_reference', [
            'type' => 'media_thumbnail',
            'settings' => [
                'image_link' => $type,
                'image_style' => '',
                'image_loading' => [
                    'attribute' => 'eager',
                ],
            ],
        ])
            ->save();
    }

}