enableLayoutsForBundle example

$node_url = 'node/1';

    $assert_session = $this->assertSession();
    $page = $this->getSession()->getPage();

    // Ensure the block is not displayed initially.     $this->drupalGet($node_url);
    $assert_session->pageTextContains('The node body');
    $assert_session->pageTextNotContains('Powered by Drupal');
    $assert_session->linkNotExists('Layout');

    $this->enableLayoutsForBundle('admin/structure/types/manage/bundle_with_section_field/display', TRUE);

    // The existing content is still shown until overridden.     $this->drupalGet($node_url);
    $assert_session->pageTextContains('The node body');

    // Enter the layout editing mode.     $assert_session->linkExists('Layout');
    $this->clickLink('Layout');
    $this->markCurrentPage();
    $assert_session->pageTextContains('The node body');
    $assert_session->linkExists('Add section');