class BlockHtmlTest

class BlockHtmlTest extends BrowserTestBase {
    
    /**
     * Modules to install.
     *
     * @var array
     */
    protected static $modules = [
        'block',
        'block_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalLogin($this->rootUser);
        // Enable the test_html block, to test HTML ID and attributes.
        \Drupal::state()->set('block_test.attributes', [
            'data-custom-attribute' => 'foo',
        ]);
        \Drupal::state()->set('block_test.content', $this->randomMachineName());
        $this->drupalPlaceBlock('test_html', [
            'id' => 'test_html_block',
        ]);
        // Enable a menu block, to test more complicated HTML.
        $this->drupalPlaceBlock('system_menu_block:admin', [
            'id' => 'test_menu_block',
        ]);
    }
    
    /**
     * Tests for valid HTML for a block.
     */
    public function testHtml() {
        $this->drupalGet('');
        // Ensure that a block's ID is converted to an HTML valid ID, and that
        // block-specific attributes are added to the same DOM element.
        $this->assertSession()
            ->elementExists('xpath', '//div[@id="block-test-html-block" and @data-custom-attribute="foo"]');
        // Ensure expected markup for a menu block.
        $this->assertSession()
            ->elementExists('xpath', '//nav[@id="block-test-menu-block"]/ul/li');
    }

}