class NodeFieldMultilingualTest

class NodeFieldMultilingualTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'node',
        'language',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create Basic page node type.
        $this->drupalCreateContentType([
            'type' => 'page',
            'name' => 'Basic page',
        ]);
        // Setup users.
        $admin_user = $this->drupalCreateUser([
            'administer languages',
            'administer content types',
            'access administration pages',
            'create page content',
            'edit own page content',
        ]);
        $this->drupalLogin($admin_user);
        // Add a new language.
        ConfigurableLanguage::createFromLangcode('it')->save();
        // Enable URL language detection and selection.
        $edit = [
            'language_interface[enabled][language-url]' => '1',
        ];
        $this->drupalGet('admin/config/regional/language/detection');
        $this->submitForm($edit, 'Save settings');
        // Set "Basic page" content type to use multilingual support.
        $edit = [
            'language_configuration[language_alterable]' => TRUE,
        ];
        $this->drupalGet('admin/structure/types/manage/page');
        $this->submitForm($edit, 'Save content type');
        $this->assertSession()
            ->pageTextContains("The content type Basic page has been updated.");
        // Make node body translatable.
        $field_storage = FieldStorageConfig::loadByName('node', 'body');
        $field_storage->setTranslatable(TRUE);
        $field_storage->save();
    }
    
    /**
     * Tests whether field languages are correctly set through the node form.
     */
    public function testMultilingualNodeForm() {
        // Create "Basic page" content.
        $langcode = language_get_default_langcode('node', 'page');
        $title_key = 'title[0][value]';
        $title_value = $this->randomMachineName(8);
        $body_key = 'body[0][value]';
        $body_value = $this->randomMachineName(16);
        // Create node to edit.
        $edit = [];
        $edit[$title_key] = $title_value;
        $edit[$body_key] = $body_value;
        $this->drupalGet('node/add/page');
        $this->submitForm($edit, 'Save');
        // Check that the node exists in the database.
        $node = $this->drupalGetNodeByTitle($edit[$title_key]);
        $this->assertNotEmpty($node, 'Node found in database.');
        $this->assertSame($langcode, $node->language()
            ->getId());
        $this->assertSame($body_value, $node->body->value);
        // Change node language.
        $langcode = 'it';
        $this->drupalGet("node/{$node->id()}/edit");
        $edit = [
            $title_key => $this->randomMachineName(8),
            'langcode[0][value]' => $langcode,
        ];
        $this->submitForm($edit, 'Save');
        $node = $this->drupalGetNodeByTitle($edit[$title_key], TRUE);
        $this->assertNotEmpty($node, 'Node found in database.');
        $this->assertSame($langcode, $node->language()
            ->getId());
        $this->assertSame($body_value, $node->body->value);
        // Enable content language URL detection.
        $this->container
            ->get('language_negotiator')
            ->saveConfiguration(LanguageInterface::TYPE_CONTENT, [
            LanguageNegotiationUrl::METHOD_ID => 0,
        ]);
        // Test multilingual field language fallback logic.
        $this->drupalGet("it/node/{$node->id()}");
        // Verify that body is correctly displayed using Italian as requested
        // language.
        $this->assertSession()
            ->pageTextContains($body_value);
        $this->drupalGet("node/{$node->id()}");
        // Verify that body is correctly displayed using English as requested
        // language.
        $this->assertSession()
            ->pageTextContains($body_value);
    }
    
    /**
     * Tests multilingual field display settings.
     */
    public function testMultilingualDisplaySettings() {
        // Create "Basic page" content.
        $title_key = 'title[0][value]';
        $title_value = $this->randomMachineName(8);
        $body_key = 'body[0][value]';
        $body_value = $this->randomMachineName(16);
        // Create node to edit.
        $edit = [];
        $edit[$title_key] = $title_value;
        $edit[$body_key] = $body_value;
        $this->drupalGet('node/add/page');
        $this->submitForm($edit, 'Save');
        // Check that the node exists in the database.
        $node = $this->drupalGetNodeByTitle($edit[$title_key]);
        $this->assertNotEmpty($node, 'Node found in database.');
        // Check if node body is showed.
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->elementTextEquals('xpath', "//article/div//p", $node->body->value);
    }

}