class LayoutTest

class LayoutTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
        'layout_discovery',
        'layout_test',
    ];
    
    /**
     * The layout plugin manager.
     *
     * @var \Drupal\Core\Layout\LayoutPluginManagerInterface
     */
    protected $layoutPluginManager;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->layoutPluginManager = $this->container
            ->get('plugin.manager.core.layout');
    }
    
    /**
     * Tests that a layout provided by a theme has the preprocess function set.
     */
    public function testThemeProvidedLayout() : void {
        $this->container
            ->get('theme_installer')
            ->install([
            'test_layout_theme',
        ]);
        $this->config('system.theme')
            ->set('default', 'test_layout_theme')
            ->save();
        $theme_definitions = $this->container
            ->get('theme.registry')
            ->get();
        $this->assertContains('template_preprocess_layout', $theme_definitions['test_layout_theme']['preprocess functions']);
    }
    
    /**
     * Tests rendering a layout.
     *
     * @dataProvider renderLayoutData
     */
    public function testRenderLayout($layout_id, $config, $regions, array $html) : void {
        $layout = $this->layoutPluginManager
            ->createInstance($layout_id, $config);
        $built['layout'] = $layout->build($regions);
        $built['layout']['#prefix'] = 'Test prefix' . "\n";
        $built['layout']['#suffix'] = 'Test suffix' . "\n";
        // Assume each layout is contained by a form, in order to ensure the
        // building of the layout does not interfere with form processing.
        $form_state = new FormState();
        $form_builder = $this->container
            ->get('form_builder');
        $form_builder->prepareForm('the_form_id', $built, $form_state);
        $form_builder->processForm('the_form_id', $built, $form_state);
        $this->render($built);
        // Add in the wrapping form elements and prefix/suffix.
        array_unshift($html, 'Test prefix');
        array_unshift($html, '<form data-drupal-selector="the-form-id" action="/" method="post" id="the-form-id" accept-charset="UTF-8">');
        // Retrieve the build ID from the rendered HTML since the string is random.
        $build_id_input = $this->cssSelect('input[name="form_build_id"]')[0]
            ->asXML();
        $form_id_input = '<input data-drupal-selector="edit-the-form-id" type="hidden" name="form_id" value="the_form_id"/>';
        $html[] = 'Test suffix';
        $html[] = $build_id_input . "\n" . $form_id_input . "\n" . '</form>';
        // Match the HTML to the full form element.
        $this->assertSame(implode("\n", $html), $this->cssSelect('#the-form-id')[0]
            ->asXML());
    }
    
    /**
     * {@inheritdoc}
     */
    protected function render(array &$elements) {
        $content = parent::render($elements);
        // Strip leading whitespace from every line.
        $this->content = preg_replace('/^\\s+/m', '', $content);
        return $this->content;
    }
    
    /**
     * Data provider for testRenderLayout().
     */
    public static function renderLayoutData() {
        $html = [];
        $html[] = '<div data-drupal-selector="edit-layout" class="layout layout--onecol">';
        $html[] = '<div data-drupal-selector="edit-content" class="layout__region layout__region--content">';
        $html[] = 'This is the content';
        $html[] = '</div>';
        $html[] = '</div>';
        $data['layout_onecol'] = [
            'layout_onecol',
            [],
            [
                'content' => [
                    '#markup' => 'This is the content',
                ],
            ],
            $html,
        ];
        $html = [];
        $html[] = '<div data-drupal-selector="edit-layout" class="layout-example-1col clearfix">';
        $html[] = '<div data-drupal-selector="edit-top" class="region-top">';
        $html[] = 'This string added by #process.';
        $html[] = '</div>';
        $html[] = '<div data-drupal-selector="edit-bottom" class="region-bottom">';
        $html[] = 'This is the bottom';
        $html[] = '</div>';
        $html[] = '</div>';
        $data['layout_test_1col_with_form'] = [
            'layout_test_1col',
            [],
            [
                'top' => [
                    '#process' => [
                        [
                            static::class,
                            'processCallback',
                        ],
                    ],
                ],
                'bottom' => [
                    '#markup' => 'This is the bottom',
                ],
            ],
            $html,
        ];
        $html = [];
        $html[] = '<div data-drupal-selector="edit-layout" class="layout-example-1col clearfix">';
        $html[] = '<div data-drupal-selector="edit-top" class="region-top">';
        $html[] = 'This is the top';
        $html[] = '</div>';
        $html[] = '<div data-drupal-selector="edit-bottom" class="region-bottom">';
        $html[] = 'This is the bottom';
        $html[] = '</div>';
        $html[] = '</div>';
        $data['layout_test_1col'] = [
            'layout_test_1col',
            [],
            [
                'top' => [
                    '#markup' => 'This is the top',
                ],
                'bottom' => [
                    '#markup' => 'This is the bottom',
                ],
            ],
            $html,
        ];
        $html = [];
        $html[] = '<div data-drupal-selector="edit-layout" class="layout layout--layout-test-1col-no-template">';
        $html[] = '<div data-drupal-selector="edit-top" class="layout__region layout__region--top">';
        $html[] = 'This is the top';
        $html[] = '</div>';
        $html[] = '<div data-drupal-selector="edit-bottom" class="layout__region layout__region--bottom">';
        $html[] = 'This is the bottom';
        $html[] = '</div>';
        $html[] = '</div>';
        $data['layout_test_1col_no_template'] = [
            'layout_test_1col_no_template',
            [],
            [
                'top' => [
                    '#markup' => 'This is the top',
                ],
                'bottom' => [
                    '#markup' => 'This is the bottom',
                ],
            ],
            $html,
        ];
        $html = [];
        $html[] = '<div data-drupal-selector="edit-layout" class="layout-example-2col clearfix">';
        $html[] = '<div data-drupal-selector="edit-left" class="class-added-by-preprocess region-left">';
        $html[] = 'This is the left';
        $html[] = '</div>';
        $html[] = '<div data-drupal-selector="edit-right" class="region-right">';
        $html[] = 'This is the right';
        $html[] = '</div>';
        $html[] = '</div>';
        $data['layout_test_2col'] = [
            'layout_test_2col',
            [],
            [
                'left' => [
                    '#markup' => 'This is the left',
                ],
                'right' => [
                    '#markup' => 'This is the right',
                ],
            ],
            $html,
        ];
        $html = [];
        $html[] = '<div data-drupal-selector="edit-layout" class="layout-test-plugin clearfix">';
        $html[] = '<div>';
        $html[] = '<span class="setting-1-label">Blah: </span>';
        $html[] = 'Config value';
        $html[] = '</div>';
        $html[] = '<div data-drupal-selector="edit-main" class="region-main">';
        $html[] = 'Main region';
        $html[] = '</div>';
        $html[] = '</div>';
        $data['layout_test_plugin'] = [
            'layout_test_plugin',
            [
                'setting_1' => 'Config value',
            ],
            [
                'main' => [
                    '#markup' => 'Main region',
                ],
            ],
            $html,
        ];
        return $data;
    }
    
    /**
     * Provides a test #process callback.
     */
    public static function processCallback($element) {
        $element['#markup'] = 'This string added by #process.';
        return $element;
    }

}