function LayoutBuilderBlocksTest::testBlockPlaceholder

Tests the usage of placeholders for empty blocks.

See also

\Drupal\Core\Render\PreviewFallbackInterface::getPreviewFallbackString()

\Drupal\layout_builder\EventSubscriber\BlockComponentRenderArray::onBuildRender()

File

core/modules/layout_builder/tests/src/Functional/LayoutBuilderBlocksTest.php, line 186

Class

LayoutBuilderBlocksTest

Tests the Layout Builder UI with blocks.

Namespace

Code

public function testBlockPlaceholder() : void {
    $assert_session = $this->assertSession();
    $page = $this->getSession()
        ->getPage();
    $this->drupalLogin($this->drupalCreateUser([
        'configure any layout',
        'administer node display',
    ]));
    $field_ui_prefix = 'admin/structure/types/manage/bundle_with_section_field';
    $this->drupalGet("{$field_ui_prefix}/display/default");
    $this->submitForm([
        'layout[enabled]' => TRUE,
    ], 'Save');
    // Customize the default view mode.
    $this->drupalGet("{$field_ui_prefix}/display/default/layout");
    // Add a block whose content is controlled by state and is empty by default.
    $this->clickLink('Add block');
    $this->clickLink('Test block caching');
    $page->fillField('settings[label]', 'The block label');
    $page->pressButton('Add block');
    $block_content = 'I am content';
    $placeholder_content = 'Placeholder for the "The block label" block';
    // The block placeholder is displayed and there is no content.
    $assert_session->pageTextContains($placeholder_content);
    $assert_session->pageTextNotContains($block_content);
    // Set block content and reload the page.
    \Drupal::state()->set('block_test.content', $block_content);
    $this->getSession()
        ->reload();
    // The block placeholder is no longer displayed and the content is visible.
    $assert_session->pageTextNotContains($placeholder_content);
    $assert_session->pageTextContains($block_content);
}