class AreaEmptyTest

class AreaEmptyTest extends ViewsKernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp($import_test_views = TRUE) : void {
        parent::setUp();
        $this->installEntitySchema('node');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function viewsData() {
        $data = parent::viewsData();
        $data['views']['test_example'] = [
            'title' => 'Test Example area',
            'help' => 'A area handler which just exists for tests.',
            'area' => [
                'id' => 'test_example',
            ],
        ];
        return $data;
    }
    
    /**
     * Views used by this test.
     *
     * @var array
     */
    public static $testViews = [
        'test_example_area',
    ];
    
    /**
     * Tests that the header and footer areas are not rendered if empty.
     */
    public function testRenderEmptyHeaderFooter() : void {
        $view = Views::getView('test_example_area');
        $view->initHandlers();
        // Set example empty text.
        $empty_text = $this->randomMachineName();
        $empty_header = $this->randomMachineName();
        $empty_footer = $this->randomMachineName();
        // Set empty text.
        $view->empty['test_example']->options['string'] = '<p>' . $empty_text . '</p>';
        // Set example header text.
        $view->header['test_example']->options['string'] = '<p>' . $empty_header . '</p>';
        // Set example footer text.
        $view->footer['test_example']->options['string'] = '<p>' . $empty_footer . '</p>';
        // Verify that the empty header and footer sections have not been rendered.
        $view->setDisplay('default');
        $this->executeView($view);
        $output = $view->render();
        $output = \Drupal::service('renderer')->renderRoot($output);
        $this->setRawContent($output);
        $this->assertText($empty_text);
        $this->assertNoText($empty_header);
        $this->assertNoText($empty_footer);
        // Enable displaying the header and footer when the View is empty.
        $view->header['test_example']->options['empty'] = TRUE;
        $view->footer['test_example']->options['empty'] = TRUE;
        // Verify that the header and footer sections have been rendered.
        $this->executeView($view);
        $output = $view->render();
        $output = \Drupal::service('renderer')->renderRoot($output);
        $this->setRawContent($output);
        $this->assertText($empty_header);
        $this->assertText($empty_footer);
    }

}